Some Basics Concepts of Chemistry Questions
Q.45 A blue solution of copper sulphate becomes darker when treated with excess of ammonia. This is because –
Q.44 The order of stability of complexes of ion Cu+2, Ni+2, Mn+2 and Fe+2 decreases in the order -
Q.43 Peptide bond group is characteristic of-
Q.42 Which of the following is not a reducing sugar ?
Q.41 Gabriel phthalimide reaction is used to prepare -
Q.40 In hypobromite reaction of amide, carbonyl carbon atom is lost as -
Q.39 In the reaction sequence : A -> B -> Acetone -> C. A, B and C are -
Q.38 (CH3)2C = CHCOCH3 can be oxidised to (CH3)2C = CH. COOH by -
Q.37 CH3 – CH2 – CHO -> Product. The product in the above reaction is:
Q.36 Which gives a ketone on treating with a Grignard’s reagent -
Q.35 Indenify A, B, and C in the following reactions–
Q.34 C2H5NH2 -> B -> C -> D the product D is an-
Q.33 Zn and Hg do not show variable valency like d-block elements because-
Q.32 Which of the following statements is correct ?
Q.31 Compounds (A) and (B) are - [Reference to Reaction Image implied]
Q.30 Pick out incorrect statement -
Q.29 A first order reaction takes 69.3 minute for 50% completion. How much time will be needed for 80% completion -
Q.28 For a reaction 3A -> products, it is found that the rate of reaction doubles, if concentration of A is increased four times, calculate order of reaction -
Q.27 The charge required to deposit 40.5 g of Al (atomic mass = 27.0 g) from the fused Al2 (SO4)3 is-
Q.26 The equivalent conductivities at infinite dilution of the cation and the anion of a salt A2B are 140 and 80 ohm–1 cm2 eq–1 respectively. The equivalent conductivity of the salt at infinite dilution is-
Q.25 0.2 molal acid HX is 20% ionised in solution Kf = 1.86 K molality–1. The freezing point of the solution is -
Q.24 The molarity of 20% (W/W) solution of sulphuric acid is 2.55 M. The density of the solution is :
Q.23 The yield of alkyl bromide obtained as a result of heating the dry silver salt of carboxyic acid with bromine what will be the order of formation w.r.t. alkyl bromide -
Q.22 The best reagent for converting ethanol to chloroethane is -
Q.21 Which one of the following compounds will be most easily attacked by an electrophile ?
Q.20 Correct order of nucleophilicity -
Q.18 The possible number of alkynes with the formula C5H8 is -
Q.17 The I.U.P.A.C. name of compound (CH3)3C.CH2CONH2 is : –
Q.16 The formula CnH2n – 2 shows -
Q.15 Name of the structure of silicates in which three oxygen atoms of [SiO4]4– are shared -
Q.14 Boron cannot form which one of the following anions ?
Q.13 The dissociation constant of weak acid HA is 4.9×10–8. After making the necessary approximations . Calculate pH in 0.1 M acid –
Q.12 For the reaction N2 + 3H2 2NH3 , N2 & H2 were taken in the molar ratio of 1 : 3 . Up to the point of equilibrium 50% each reactant has been reacted. If total pressure at equilibrium is P. The partial pressure of ammonia would be –
Q.11 The value of KC for the reaction : A + 3B -> 2C is 0.5 at 400°C. Calculate the value of KP
Q.10 Heat of reaction for C6H12O6 (s) + 6O2 (g) -> 6CO2 (g) + 6H2O (g) at constant pressure is –651 Kcal at 17ºC. Calculate the heat of reaction at constant volume at 17ºC-
Q.9 A gas absorbs 200J of heat and expands against the external pressure of 1.5 atm from a volume of 0.5 litre to 1.0 litre, Calculate the change in internal energy -
Q.8 The ratio of sigma to pi bonds in mesitylene is
Q.7 The electronegativity of O,F,N, Cl and H are 3.5, 4.0, 3.0 and 2.1 respectively. The strongest bond will be :
Q.6 The correct decreasing order of atomic size among the following species is : Ar, K+, Cl–, S2–, Ca2+
Q.5 The electronic configuration of an element is 1s2, 2s2 2p6, 3s2 3p4. The atomic number of the element present just below the above element in the periodic table -
Q.4 The ionization energy of H-atom is 13.6 eV. The ionization energy of Li+2 ion will be -
Q.3 The ionization energy of He+ is 19.6 × 10–18 J atom–1. The energy of the first stationary state of Li+2 will be -
Q.2 Naturally occurring chlorine is 75 % Cl35 and 25 % Cl37. Calculate the average atomic mass of chlorine-
Q.1 8 litre of H2 and 6 litre of Cl2 are allowed to react to maximum possible extent. Find out the final volume of reaction mixture. Suppose P and T remains constant throughout the course of reaction -
this is demo questions?
How many moles of Mg3(PO4)2 will contain 0.25 mole of oxygen atoms?
Which of the following will weigh maximum?
The density of O2 at NTP is 1.429 g/L. Calculate the standard molar volume.
Calculate the weight of one atom of Ag (At. wt. = 108).
The simplest formula of a compound containing 50% X (At. mass = 10) and 50% Y (At. mass = 20) is: