NEET Chemistry Chapter Wise Mock Test -Physical Chemistry II
Cleavage readily occurs along planes in crystals of ionic solids because the ions in the crystal are
(a) arranged in a regular fashion
(b) strongly bonded together
(c) weakly bonded together
(d) separated by a large distance
Percentage of free space in cubic close packed structure and in body centred packed structure respectively are
(a) 30% and 26%
(b) 26% and 32%
(c) 32% and 48%
(d) 48% and 26%
Latent heat of vaporisation of water is 9.72 kcal mol-1 at 373.15 K. Calculate the molal boiling point elevation constant of water.
Addition of a non-volatile solute causes lowering in vapour pressure of a solvent from 0.8 atm to 0.2 atm. What is the mole fraction of solvent?
(d) Cannot be predicted
If hydrogen electrode dipped in two solutions of pH = 3 and pH =6 and salt bridge is connected, the emf of resulting cell is
(b) 0.3 V
(c) 0.052 V
(d) 0.104 V
Catalytic poisons act by
(a) making the products chemically inactive
(b) increasing the rate of the backward reactions
(c) chemical combination with any one of the reactants
(d) preferential adsorption on the catalyst surface
Select the incorrect statements.
(a) Physical adsorption is reversible while chemical is irreversible
(b) High pressure favours physical adsorption while low Pressure favours chemical adsorption
(c) Physical adsorption is not specific while chemical is highly specific
(d) High activation energy is involved in chemical adsorption
Direction (Q. NOS. 36-37) In the following questions more than one of the answers given may be correct. Select the correct answers and mark it according.to the codes.
(a) 1, 2 and 3 are correct
(b) 1 and 2 are correct
(c) 2 and 4 are correct
(d) 1 and 3 are correct
Direction (Q. Nos. 39-40) Each of these questions contains two statements: Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) Assertion is true, Reason is true; Reason is a correct explanation for Assertion
(b) Assertion is true, Reason is true; Reason is not a correct explanation for Assertion
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is true
Assertion Crystalline solids are anisotropic.
Reason Crystalline solids are not as closely packed as amorphous solids.
Assertion The decomposition of NH3 on finely divided platinum surface is first order when the concentration is low, however at higher concentration, the reaction becomes zero order.
Reason In first order reaction, the rate of reaction is proportional to the first power of the concentration of the reactant.
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