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Chemistry

P-block Elements

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Compounds (A) and (B) are -

NaClO₃, NaClO

NaOCl₂, NaOCl

NaClO₄, NaClO₃

NaOCl, NaClO₃

Hydrolysis of one mole of peroxodisulphuric acid produces

Two moles of sulphuric acid

Two moles of peroxomonosulphuric acid

One mole of sulphuric acid and one mole of peroxomonosulphuric acid

One mole each of sulphuric acid, peroxomonosulphuric acid and hydrogen peroxide.

The correct no. of lone pairs on the central atom of compounds XeF₂, XeF₄ & XeF₆ are respectively

3, 2,1

4, 3, 2

1, 3, 4

1, 2, 3

The most common oxidation state(s) shown by elements of 15th group of periodic table is/are :

–3

–3, +5

+3, +5

–3, +3, +5

Statement - I : Boron always forms covalent bond.

Statement - II : The small size of B³⁺ favours formation of covalent bond.

Statement - I is true, Statement- II is true; Statement - II is correct explanation of statement - I

Statement - 1, is true, Statement - 2 is true; statement - 2 is NOT a correct explanation for Statement - 1

Statement - 1 is true, Statement - 2, is false

Statement - 1, False, Statement - 2 is true

The incorrect match regarding oxoacids of sulphur and their respective bonds is

Sulphurous acid – One S=O bond and two S–OH bonds

Peroxodisulphuric acid – Three S=O bonds and two S–OH bonds

Pyrosulphuric acid – Four S=O bonds and two S–OH bonds

Sulphuric acid – Two S=O bonds and two S–OH bonds

Boron cannot form which one of the following anions ?

$B F_{6}^{3 -}$ .

$B H_{4}^{-}$ .

$B (OH)_{4}^{-}$ .

$B O_{2}^{-}$ .

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the product D is an

Alcohol

Ether

Alkyne

Ester

Given below are two statements :

Statement I: The increasing order of boiling point of hydrogen halides is HCl < HBr < HI < HF.

Statement II: The increasing order of melting point of hydrogen halides is HCl < HBr < HF < HI.

In the light of the above statements, choose the correct answer from the options given below :

Both Statement I and Statement II are false

Both Statement I and Statement II are true

Statement I is false but Statement II is true

Statement I is true but Statement II is false

Identify the correct sequence of increasing number of π-bonds in the structures of the following molecules :

(I) H₂S₂O₆ (II) H₂SO₃(III) H₂S₂O₅

I, II, III

II, III, I

II, I, III

I, III, II

Given below are two statements: one is labelled as Assertion (A) and other is labelled as Reason (R)

Assertion (A): The boiling point of hydrides of group 17 elements follows the order : HF > HCl > HI > HBr

Reason (R): Due to the presence of extensive hydrogen bonding in HF and HCl, they have higher boiling points as compared to hydrides of other members of the group 17.

In the light of above statements, choose the correct answer from the options given below

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

Metal salt (A) on treatment with dil H₂SO₄ gives effervescence. The produced gas turns lime water milky. If excess of produced gas is passed in it, a clear solution is obtained. The metal salt is

Chloride

Carbonate

Oxalate

Phosphate

Pick out incorrect statement

Orthohophorus acid can be obtained by reacting P₄O₆ with H₂O

Orthophosphoric acid can be obtained by reacting P₄O₁₀ with H₂O

Pyrophosphoric acid can be obtained by heating orthophosphourus acid

Metaphosphoric acid is obtained by the dehydration of orthophosphoric acid at 316°C

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