Periodic Table — Free Practice Questions | Mockzy

1

The atomic number of three elements A, B and C are a, a +1 and a + 2, C is an alkali metal in compound of A and C, the nature of bonding is;

A

co-ordinate

B

covalent

C

ionic

D

metallic

2

A

B

C

D

3

The correct decreasing order of atomic radii of group 13 elements is

A

Tl > In > Ga > Al

B

Tl > Ga > In > Al

C

Tl > Al > Ga > In

D

Tl > In > Al > Ga

4

Which of the following is not a Dobereiner's Triad?

A

Li, Na, K

B

Cl, Br, I

C

F, Cl, Br

D

Ca, Sr, Ba

5

Which of the following element is a metalloid?

A

Cl

B

Br

C

Si

D

Na

6

The correct decreasing order of metallic character is;

A

Be > Ca > K

B

Ca > K > Be

C

K > Ca > Be

D

K > Be > Ca

7

As per modern periodic law, the physical and chemical properties of elements are periodic functions of their:

A

Atomic number

B

Atomic size

C

Atomic volume

D

Atomic weight

8

Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: In each period, second ionization energy of alkali metal is highest. Reason R: Second electron is removed in alkali metals from noble gas configuration which is most stable. In the light of the above statements, choose the correct answer from the options given below:

A

A is true but R is false.

B

A is false but R is true

C

Both A and R are true and R is the correct explanation of A.

D

Both A and R are true but R is NOT the correct explanation of A.

9

Which of the following elements is Eka-aluminium?

A

Ge

B

Ga

C

Si

D

B

10

Given below are two statements: Statement I: 5th period of the periodic table contains 32 elements. Statement II: Metals are good conductors of heat and electricity. In the light of the above statements, choose the most appropriate answer from the options given below:

A

Both Statement I and Statement II are correct.

B

Statement I is correct but Statement II is incorrect.

C

Statement I is incorrect but Statement II is correct.

D

Both Statement I and Statement II are incorrect.

11

First member of a group in s-block and groups 13-17 shows anomalous behaviour due to its. (A) Small size (B) Large (Charge/radius) ratio (C) High electronegativity Correct option is;

A

A and B only

B

B and C only

C

A and C only

D

A, B and C

12

The atomic number of the element having highest electron affinity in the periodic table is;

A

8

B

17

C

9

D

16

13

Given below are two statements : Statement I: An element in the extreme left of the periodic table forms acidic oxides. Statement II: Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table. In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is correct but Statement II is incorrect.

B

Statement I is incorrect but Statement II is correct.

C

Both Statement I and Statement II are correct.

D

Both Statement I and Statement II are incorrect.

14

The elements with atomic numbers 90 to 103 are known as -

A

d-block elements

B

lanthanides

C

actinides

D

transition elements

15

The IUPAC name of the element having atomic number 141 is:

A

Unquadunium

B

Untetraunium

C

Unquadnilium

D

Untetranilium

16

Which of the following electronic configuration of an atom has the lowest ionization enthalpy?

A

1s2 2s2 2p5

B

1s2 2s2 2p3

C

1s2 2s2 2p6 3s1

D

1s2 2s2 2p6

17

If an element X has the group number 16 and the period number 4. Then the atomic number of X is;

A

35

B

34

C

36

D

54

18

First members of groups 13–17 shows anomalous behaviour due to their:

A

high electronegativity

B

small size

C

large charge/radius ratio

D

All of these

19

The element having the greatest difference between its first and second ionization energies is;

A

Ca

B

Sc

C

K

D

Ba

20

Beryllium shows diagonal relationship with:

A

Magnesium

B

Silicon

C

Aluminium

D

Sodium

21

In which of the following arrangements the order is not according to the property indicated against it?

A

B

C

D

22

Given below are two statements: Statement I: Fluorine is more electronegative than oxygen. Statement II: Lanthanoids and actinoids both belong to same group. In the light of the above statements, choose the most appropriate answer from the options given below.

A

Both Statement I and Statement II are correct.

B

Statement I is correct but Statement II is incorrect.

C

Statement I is incorrect but Statement II is correct.

D

Both Statement I and Statement II are incorrect.

23

Which of the following properties of group 16 elements show decreasing trend down the group? A. Atomic radius B. Ionisation enthalpy C. Electronegativity Choose the most appropriate answer from the options given below:

A

A and B

B

A and C

C

B and C

D

A, B and C

24

Match List-I with List-II. List-I (Oxides) A. K2O B. CO2 C. Al2O3 D. CO List-II (Nature of oxides) I. Amphoteric II. Basic III. Acidic IV. Neutral Choose the correct answer from the options given below:

A

A-II, B-III, C-I, D-IV

B

A-III, B-I, C-II, D-IV

C

A-I, B-II, C-IV, D-III

D

A-IV, B-II, C-III, D-I

25

Atomic number of element Ununnilium is;

A

101

B

110

C

111

D

100

26

Which one of the following is the reason behind fluorine having lower electron affinity than chlorine?

A

Smaller radius of fluorine, high electron density.

B

Smaller radius of chlorine, high electron density.

C

Bigger radius of fluorine, less electron density.

D

Smaller radius of chlorine, less electron density.

27

The element having the highest first ionization enthalpy is:

A

P

B

Al

C

N

D

C

28

The atomic masses of Li and K are 7 and 39, respectively. According to law of triads, the atomic mass of Na will be;

A

23

B

32

C

46

D

64

29

For a given shell, the screening effect of d-electrons is;

A

Equal to the p-electrons

B

Much more than p-electrons

C

Same as f-electrons

D

Less than p-electrons

30

Consider the following changes, A → A⁺ + e⁻ (E1) A⁺ → A²⁺ + e⁻ (E2) The energy required to pull out the two electrons are E1 and E2 respectively. The correct relationship between two energies would be:

A

B

E1 = E2

C

E1 > E2

D

E1 ≥ E2

31

Which among the following statements are correct? A. s–block, p–block and d–block elements are together known as Representative elements. B. The elements after uranium are called Transuranium elements. C. f–block elements are known as Inner–transition elements. Choose the most appropriate answer from the options given below.

A

Only A and B

B

Only A and C

C

Only B and C

D

A, B and C

32

Match List-I with List-II. List-I (A) Most electronegative element (B) The element having highest electron affinity (C) The element having lowest ionisation enthalpy (D) The element having highest ionisation enthalpy List-II (I) Chlorine (II) Cesium (III) Helium (IV) Fluorine Choose the correct answer from the options given below:

A

A-I, B-II, C-III, D-IV

B

A-IV, B-III, C-II, D-I

C

A-IV, B-I, C-II, D-III

D

A-II, B-III, C-IV, D-I

33

The electronic configuration for manganese is;

A

1s2 2s2 2p6 3s2 3p5

B

[Ar]4s1

C

1s2 2s2 2p6 3s2 3p6 4s2 3d5

D

1s2 2s2 2p6

34

The electronic configuration for manganese is;

A

1s2 2s2 2p6 3s2 3p5

B

[Ar]4s1

C

1s2 2s2 2p6 3s2 3p6 4s2 3d5

D

1s2 2s2 2p6

35

The most electropositive element is;

A

Cs

B

Ga

C

Li

D

Pb

36

Which of the following is not representative element?

A

Boron

B

Tantalum

C

Thallium

D

Sodium

37

Match List-I with List-II. List-I (Atomic number) (A) 101 (B) 87 (C) 105 (D) 116 List-II (block) (I) s-block (II) p-block (III) d-block (IV) f-block Choose the correct answer from the options given below:

A

A-I, B-IV, C-III, D-II

B

A-IV, B-I, C-III, D-II

C

A-II, B-III, C-I, D-IV

D

A-I, B-IV, C-II, D-III

38

The elements of group 17 are called;

A

noble gases.

B

halogens.

C

chalcogens.

D

alkali metals.

39

Which of the following is the correct order of second ionisation potential?

A

B

C

D

40

A

B

C

D

41

According to Henry Moseley, what does Z represent in the graph?

A

Atomic mass

B

Atomic number

C

Mass number

D

Number of neutrons

42

Which among the following oxides is neutral in nature?

A

Al₂O₃

B

Cl₂O₇

C

N₂O

D

Na₂O

43

For a given shell, the screening effect of d-electrons is:

A

equal to the p-electrons.

B

much more than p-electrons.

C

same as f-electrons.

D

less than p-electrons.

44

Which of the following is the most acidic in nature?

A

Cl2O7

B

Al2O3

C

Na2O

D

As2O3

45

A

1.36, 1.40 and 1.71

B

1.36, 1.71 and 1.40

C

1.71, 1.40 and 1.36

D

1.71, 1.36 and 1.40

46

The correct increasing order of metallic character for the given metals is:

A

B

C

D

47

The electronic configuration of an element is 1s2 2s2 2p6 3s2 3p3 . What is the atomic number of the element, which is just below the above element in the periodic table?

A

33

B

34

C

36

D

49

48

The atom having the valence shell electronic configuration 4s² 4p² would be in-

A

Group II A and period 3

B

Group II B and period 4

C

Group IV A and period 4

D

Group IV A and period 3

49

From the following atomic numbers, the elements belonging to the same group is;

A

Z = 12, 38, 4, 88

B

Z = 9, 16, 3, 35

C

Z = 5, 11, 27, 19

D

Z = 24, 47, 42, 55

50

Which of the following sets of elements belong to the same period?

A

Li, Na and K

B

Li, Mg and Ca

C

Ni, Cu and Zn

D

F, Cl and Br

51

Second ionization potential of Li, Be and B is in the order;

A

Li > Be > B

B

Li > B > Be

C

Be > Li > B

D

B > Be > Li

52

Which of the following set of species are isoelectronic species?

A

N3– , K+ , Cl–

B

Li+ , Be2+ , H+

C

Na+ , Al3+ , Mg2+

D

O2– , F– , K+

53

The f-block elements belongs to which group of the periodic table?

A

II

B

III

C

IV

D

V

54

Which of the following has the largest radius?

A

B

C

D

55

From atomic no. 1 to atomic no. 110 how many of them contain e⁻ in f-subshell ?

A

28

B

57

C

58

D

53

56

Pd has exceptional electronic configuration of 4d10 5s0 . It belong to;

A

4th period, group 11

B

5th period, group 10

C

6th period, group 9

D

3rd period, group 16

57

A

B

C

D

58

The element with maximum negative electron gain enthalpy is:

A

F

B

Br

C

I

D

Cl

59

Four elements P, Q, R and S have ground state electronic configuration as given. Which of the following option(s) represent(s) the correct order ?

A

B

C

D

All of these

60

Match List-I with List-II. List-I (A) 1s2 , 2s2 2p5 (B) 1s2 , 2s2 2p6 , 3s2 3p6 (C) 1s2 , 2s1 (D) 1s2 , 2s2 2p6 , 3s2 3p6 3d6 , 4s2 List-II (I) Noble gas (II) Halogen (III) Transition element (IV) Alkali metal Choose the correct answer from the options given below:

A

A-I, B-II, C-IV, D-III

B

A-II, B-I, C-IV, D-III

C

A-II, B-I, C-III, D-IV

D

A-I, B-II, C-III, D-IV

61

A

B

C

D

62

Given below are two statements: Statement I: Li is diagonally related to Na. Statement II: 16th group elements are also known as halogens. In the light of the above statements, choose the most appropriate answer from the options given below:

A

Both Statement I and Statement II are correct.

B

Statement I is correct but Statement II is incorrect.

C

Statement I is incorrect but Statement II is correct.

D

Both Statement I and Statement II are incorrect.

63

Element with atomic number 10 belongs to;

A

2nd period

B

3rd period

C

4th period

D

5th period

64

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Size of K+ is larger than that of K atom. Reason (R): K+ has less electrons than that of K atom, while nuclear charge is same in both. In the light of the above statements, choose the correct answer from the options given below.

A

A is true but R is false.

B

A is false but R is true.

C

Both A and R are true and R is the correct explanation of A.

D

Both A and R are true but R is NOT the correct explanation of A.

65

Choose the incorrect match from the following.

A

Lanthanoids- Ce(Z = 58) to Lu(Z = 70).

B

s-block elements – reactive elements with low ionization enthalpies.

C

Actinoids- Th(Z = 90) to Lr(Z = 103)

D

s and p block elements –Representative elements.

66

If the value of principle quantum number is same, then penetration power of orbitals increases in the order;

A

B

C

D

67

Electron gain enthalpy is;

A

always positive.

B

may be negative or positive.

C

always negative.

D

always zero.

68

The IUPAC name of an element with atomic number 119 is;

A

Ununoctium

B

Ununennium

C

Unnilennium

D

Unununnium

69

Which of the following elements has the highest value of electronegativity?

A

H

B

Cl

C

Li

D

P

70

The correct sequence given below containing neutral, acidic, basic and amphoteric oxide each, respectively, is;

A

NO, Al2O3, CO2, CaO

B

Al2O3, NO, CaO, CO2

C

NO, CO2, Al2O3, CaO

D

NO, CO2, CaO, Al2O3

71

The element having highest ionization energy among the following is;

A

He

B

Ne

C

Ar

D

Kr

72

Neutral oxide among the following is/are;

A

CO

B

NO

C

N2O

D

All of these

73

In the periodic table, the basic character of oxides;

A

increases from left to right and decreases from top to bottom.

B

decreases from right to left and increases from top to bottom.

C

decreases from left to right and increases from top to bottom.

D

decreases from left to right and increases from bottom to top.

74

The element ununoctium belongs to the;

A

f-block

B

Noble gases

C

d-block

D

s-block

75

Consider the following ionisation reactions A(g) → A⁺(g) + e⁻ A⁺(g) → A²⁺(g) + e⁻ A²⁺(g) → A³⁺(g) + e⁻ The correct order of ionisation energies will be;

A

A1 > A2 > A3

B

A1 = A2 = A3

C

D

76

Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R: Assertion (A): 18th group elements are also known as inert gases. Reason (R): Group III elements are called alkaline earth metals. In the light of the above statements, choose the correct answer from the options given below:

A

A is true but R is false.

B

A is false but R is true.

C

Both A and R are true and R is the correct explanation of A.

D

Both A and R are true but R is NOT the correct explanation of A.

77

Which of the following properties of group 16 elements show decreasing trend down the group? A. Atomic radius B. Ionisation enthalpy C. Electronegativity Choose the most appropriate answer from the options given below:

A

A and B only

B

A and C only

C

B and C only

D

A, B and C

78

Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Na+ and Al3+ are isoelectronic but the magnitude of ionic radius of Al3+ is less than that of Na+. Reason R: The magnitude of effective nuclear charge on the outer shell electrons in Al3+ is less than that in Na+. In the light of the above statements, choose the correct answer from the options given below:

A

A is true but R is false.

B

A is false but R is true.

C

Both A and R are true and R is the correct explanation of A.

D

Both A and R are true but R is NOT the correct explanation of A.

79

Electronic configuration of M³⁺ is [Ar] 3d10 4s2 , it belongs to:

A

s-block

B

p-block

C

d-block

D

f-block

80

Total number of elements present in 3rd and 4th period of the periodic table respectively are:

A

18 and 32

B

8 and 8

C

18 and 18

D

8 and 18

81

An element with atomic number 55 belongs to:

A

Group 18

B

Group 17

C

Group 1

D

Group 2

82

Match List-I with List-I: List-I List-II (A) 1s2 2s2 2p6 3s2 3p6 4s1 (I) d-Block element (B) 1s2 2s2 2p6 3s2 3p6 (II) Halogen (C) 1s2 2s2 2p6 3s2 3p6 3d6 4s2 (III) Alkali metal (D) 1s2 2s2 2p5 (IV) Noble gas Choose the correct answer from the options given below:

A

A-I, B-II, C-III, D-IV

B

A-III,B-IV, C-I, D-II

C

A-I, B-III, C-II, D-IV

D

A-II, B-IV, C-III, D-I

83

The correct order of electron gain enthalpy in group 16 elements is;

A

O > S > Se

B

S > O > Se

C

S > Se > O

D

Se > S > O

84

Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Atomic radius of gallium is higher than that of aluminium. Reason R: The presence of additional 10 d-electrons offer poor screening effect for the outer electrons from increased nuclear charge in gallium. In the light of the above statements, choose the correct answer from the options given below:

A

A is true but R is false.

B

A is false but R is true

C

Both A and R are true and R is the correct explanation of A.

D

Both A and R are true but R is NOT the correct explanation of A.

85

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion (A): Group I elements have maximum size in their respective horizontal periods in the periodic table (excluding noble gases). Reason (R): Group I elements are called alkaline earth metals. In the light of the above statements, choose the correct answer from the options given below:

A

A is false but R is true.

B

A is true but R is false.

C

Both A and R are true and R is the correct explanation of A.

D

Both A and R are true but R is NOT the correct explanation of A.

86

Given below are two statements: Statement I: When size of atom decreases, the force of attraction between the nucleus and valence electrons decreases. Statement II: On moving down the group, ionization enthalpy increases. In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is correct but Statement II is incorrect.

B

Statement I is incorrect but Statement II is correct.

C

Both Statement I and Statement II are correct.

D

Both Statement I and Statement II are incorrect.

87

Which of the following transitions involve maximum amount of energy?

A

M– (g) → M(g)

B

M(g) → M+ (g)

C

M+ (g) → M2+ (g)

D

M2+ (g) → M3+ (g)

88

A

(A), (B) and (C) only

B

(D) and (E) only

C

(A), (B) and (D) only

D

(B), (C) and (E) only

89

The electronic configuration of elements A, B and C are [He]2s1 , [Ne]3s1 and [Ar]4s1 respectively. Which one of the following is the correct decreasing order for IE1 (in kJ mol–1) of A, B and C?

A

A > B > C

B

C > B > A

C

B > C > A

D

C > A > B

90

Atomic radius of Noble gases is expressed as:

A

Metallic radius

B

Covalent radius

C

Van der Waals radius

D

Ionic radius

91

The f-block elements belongs to which group of the periodic table?

A

II

B

III

C

IV

D

V

92

Given below are two statements: Statement-I: He and Be have similar outer shell electronic configuration of ns2 type. Statement-II: Both He and Be are chemically inert. In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is correct but Statement II is incorrect.

B

Statement I is incorrect but Statement II is correct.

C

Both Statement I and Statement II are correct.

D

Both Statement I and Statement II are incorrect.

93

The single bond covalent radius of P is 0.11 nm. The single bond covalent radius of Cl will be;

A

smaller than P

B

greater than P

C

same as P

D

twice of P

94

In the modern long-form of the periodic table, total number of the horizontal rows and vertical columns are respectively;

A

18 and 6

B

7 and 18

C

18 and 7

D

6 and 18

95

The single bond covalent radius of P is 0.11 nm. The single bond covalent radius of Cl will be;

A

smaller than P

B

greater than P

C

same as P

D

twice of P

96

Among the following which one has highest ionisation energy?

A

N

B

O

C

F

D

He

97

Pauling’s electronegativity values for element are useful in predicting;

A

polarity of the molecules.

B

nature of oxide.

C

metallic character.

D

All of these

98

Ce (Atomic no. = 58) is a member of;

A

s-block

B

p-block

C

d-block

D

f-block

99

Which of the following represents the correct order of increasing electron gain enthalpy (with negative sign) for the elements O, S, F and Cl?

A

B

C

D

100

From the following pairs of ions which one is not an iso-electronic pair?

A

Na+ , Mg2+

B

Mn2+, Fe3+

C

Fe2+, Mn2+

D

O2– , F–

101

Match List–I with List–II. List–I (Element) (A) Ca (Z = 20) (B) Ga (Z = 31) (C) Sc (Z = 21) (D) Ce (Z = 58) List–II (Block) (I) d-block (II) s-block (III) f-block (IV) p-block Choose the correct answer from the options given below.

A

A–II, B–IV, C–I, D–III

B

A–IV, B–II, C–III, D–I

C

A–IV, B–III, C–II, D–I

D

A–II, B–IV, C–III, D–I

102

The general outer electronic configuration of the f-block elements is:

A

(n–2)f1–14(n–1)d0–1ns2

B

(n–1)f1–14nd0–1ns2

C

(n–2)f1–14(n–1)d1ns2

D

(n–1)f1–14nd0–10ns2

103

The correct decreasing order of second ionisation potential of carbon, nitrogen, oxygen and fluorine is;

A

O > F > N > C

B

F > O > N > C

C

C > N > O > F

D

O > N > F > C

104

Which among the following electronic configuration of an element has abnormally high difference between second and third ionization energy?

A

1s2 , 2s2 2p6 , 3s1

B

1s2 , 2s2 2p6 , 3s2 3p1

C

1s2 , 2s2 2p6 , 3s2 3p2

D

1s2 ,2s2 2p6 , 3s2

105

A

+0.2 eV

B

–5.1 eV

C

–10.2 eV

D

+2.55 eV

106

Which of the following order of atomic/ionic radius is incorrect?

A

I –> I > I+

B

Mg+2> Na+> F–

C

D

Li > Be > B

107

Given below are two statements: Statement I: When size of atom decreases, the force of attraction between the nucleus and valence electrons decreases. Statement II: On moving down the group, ionization enthalpy increases. In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is correct but Statement II is incorrect.

B

Statement I is incorrect but Statement II is correct.

C

Both Statement I and Statement II are correct.

D

Both Statement I and Statement II are incorrect.

108

In the modern long-form of the periodic table, total number of the horizontal rows and vertical columns are respectively;

A

18 and 6

B

7 and 18

C

18 and 7

D

6 and 18

109

From the following atomic numbers, the elements belonging to the same group is;

A

Z = 12, 38, 4, 88

B

Z = 9, 16, 3, 35

C

Z = 5, 11, 27, 19

D

Z = 24, 47, 42, 55

110

Modern periodic table is based on the atomic number of the elements. The experiment which proved the significance of atomic number was;

A

Muliken’s oil drop experiment.

B

Moseley’s work on X-Ray spectra.

C

Bragg’s work on X-Ray diffraction.

D

discovery of X-Ray by Roentgen.

111

Which of the following is the correct increasing order of the ionisation enthalpies of the given second period elements?

A

B

C

D

112

The correct order of first ionization enthalpy is:

A

B

C

D

113

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion (A): Na+ and Al3+ are isoelectronic but the magnitude of ionic radius of Al3+ is less than that of Na+. Reason (R): The magnitude of effective nuclear charge on the outer shell electrons in Al3+ is less than that in Na+. In the light of the above statements, choose the correct answer from the options given below:

A

A is true but R is false.

B

A is false but R is true.

C

Both A and R are true and R is the correct explanation of A.

D

Both A and R are true but R is NOT the correct explanation of A.

114

Successive ionisation energies of an element X are given below (in Kcal) IP1 = 165, IP2 = 195, IP3 = 556, IP4 = 595 Electronic configuration of the element X is:

A

1s2 2s2 2p6 3s2 3p1

B

1s2 2s1

C

1s2 2s2 2p2

D

1s2 2s2 2p6 3s1

115

Which of the following pair of elements belongs to the same period?

A

Mg and Sb

B

Ca and Zn

C

Na and Ca

D

Ca and Cl

116

Which of the following d-block metal does not show most of the properties of transition elements?

A

Fe

B

Cr

C

Hg

D

Cu

117

If an element X has the group number 16 and the period number 4. Then the atomic number of X is;

A

35

B

34

C

36

D

54

118

The correct statement about ionisation energies of Cu and Zn is;

A

IE1 of Cu is less than that of Zn.

B

IE2 of Cu is more than that of Zn.

C

IE2 of Zn is more than that of Cu.

D

Both (1) and (2)

119

Newland’s law of octaves seemed to be true for elements up to:

A

Potassium

B

Magnesium

C

Calcium

D

Sulphur

120

The correct increasing order of ionic radii is:

A

B

C

D

121

3d transition series starts from 'X' and ends with 'Y'. 'X' and 'Y' respectively are:

A

Zinc and Scandium

B

Scandium and Zinc

C

Vanadium and Nickel

D

Argon and Zinc

122

The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be?

A

–2.25 eV

B

–5.1 eV

C

–10.2 eV

D

+5.1 eV

123

The correct order of ionic radii for the given ions is;

A

B

C

D

124

Which of the following represents the correct increasing order of metallic character of the given elements?

A

B

C

D

125

Which of the following species of Mn has lowest electronegativity?

A

Mn(II)

B

Mn(IV)

C

Mn(VI)

D

Mn(VII)

126

The correct order of ionic radii among the following species is;

A

Ca2+ > Cl– > S2– > P3–

B

S2– > P3– > Cl– > Ca2+

C

D

127

Which one of the following is the reason behind fluorine having lower electron affinity than chlorine?

A

Smaller radius of fluorine, high electron density.

B

Smaller radius of chlorine, high electron density.

C

Bigger radius of fluorine, less electron density.

D

Smaller radius of chlorine, less electron density.

128

Mendeleev’s periodic law states that the properties of elements are a periodic function of their;

A

atomic volume

B

atomic size.

C

atomic mass.

D

atomic number.

129

An element belongs to 3rd period and group -13 of the periodic table. Which of the following properties will be shown by the element?

A

Good conductor of electricity and metallic.

B

Liquid and non-metallic.

C

Solid and non-metallic

D

Insulator and non-metallic.

130

The electronegativity value of oxygen on the basis of Pauling scale is:

A

3.5

B

3.0

C

4.0

D

2.5

131

The atomic masses of Li and K are 7 and 39, respectively. According to law of triads, the atomic mass of Na will be;

A

23

B

32

C

46

D

64

132

Which of the following pair of elements belongs to the same period?

A

Mg and Sb

B

Ca and Zn

C

Na and Ca

D

Ca and Cl

133

Which of the following periods is the shortest one?

A

1

B

3

C

2

D

4

134

Given below are two statements: Statement I: Helium and beryllium have similar outer electronic configuration of the type ns². Statement II: Both helium and beryllium are chemically inert. In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is correct but Statement II is incorrect.

B

Statement I is incorrect but Statement II is correct.

C

Both Statement I and Statement II are correct.

D

Both Statement I and Statement II are incorrect.

135

How many elements are there in 6th period of periodic table?

A

18

B

8

C

30

D

32

136

Diagonal relationship is shown by;

A

C and S

B

Mg and Sc

C

Li and Mg

D

O and C

137

In the periodic table, the basic character of oxides;

A

increases from left to right and decreases from top to bottom.

B

decreases from right to left and increases from top to bottom.

C

decreases from left to right and increases from top to bottom.

D

decreases from left to right and increases from bottom to top.

138

Lithium shows a diagonal relationship with;

A

Mg

B

Al

C

Na

D

Ga

139

Which of the following properties generally increase down the group?

A

Atomic radius

B

Ionization enthalpy

C

Electronegativity

D

Electron gain enthalpy

140

Gd(Atomic number = 64) is a member of:

A

s-block

B

p-block

C

d-block

D

f-block

141

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): Assertion (A): Size of I– ion is larger than I atom. Reason (R): Addition of electron in I atom results in increased repulsion among the electrons and decrease in effective nuclear charge. In the light of the above statements, choose the correct answer from the options given below:

A

A is true but R is false.

B

A is false but R is true.

C

Both A and R are true and R is the correct explanation of A.

D

Both A and R are true but R is NOT the correct explanation of A.

142

The element with electronic configuration 1s2 2s2 2p6 3s2 3p6 3d8 4s2 belongs to:

A

s–block and group 2

B

d–block and group 8

C

s–block and group 10

D

d–block and group 10

143

Values of first four ionization potential of an elements are 68, 370, 400, 485. It belongs to

A

B

C

D

(1) and (3) both

144

The general outer electronic configuration of d-block elements can be represented as:

A

(n–2)d1–10ns2

B

(n–2)d0–10ns1

C

(n–1)d0–10ns2 np1–6

D

(n–1)d1–10ns0–2

145

Which of the following is not a Dobereiner’s Triad?

A

Li, Na, K

B

Cl, Br, I

C

F, Cl, Br

D

Ca, Sr, Ba

146

3d transition series starts from ‘X’ and ends with ‘Y’. ‘X’ and ‘Y’ respectively are;

A

Zinc and Scandium

B

Scandium and Zinc

C

Vanadium and Nickel

D

Argon and Zinc

147

Atomic number of Ag is 47. In the same group, the atomic numbers of elements placed above and below Ag in long form of periodic table will be;

A

29,65

B

39,79

C

29,79

D

39,65

148

In which of the following pairs, the ionisation energy of the first species is less than that of the second?

A

N, P

B

Be2+, Be

C

N, N–

D

S, P

149

Element with atomic number 10 belongs to;

A

2nd period

B

3nd period

C

4th period

D

5th period

150

Choose the incorrect match from the following.

A

Lanthanoids – Ce(Z = 58) to Lu(Z = 70).

B

s-block elements – reactive elements with low ionisation enthalpies.

C

Actinoids – Th(Z = 90) to Lr(Z = 103).

D

s and p block elements–Representative elements.

151

Consider the following statements: (A) Eka-aluminium is known as Gallium. (B) Law of Triads was given by Dobereiner. (C) Thorium is not an actinide metal. The incorrect statement(s) among the following is/are:

A

A and B

B

B only

C

A and C

D

C only

152

An element having the electronic configuration: 1s2 2s2 2p6 3s2 3p1 is:

A

an inert gas

B

a transition element

C

an inner transition element

D

a representative element