Application Questions Ch. 7 Chemical Equilibria

1. which oneof the following acids is stronger?
a) boric acid ka = 5.881*10^(-10)
b) acetic acid ka = 1.8*10^(-5)
c) benzoic acid ka = 6.3*10^(-5)
d) hydrocyanic acid ka = 7.2*10^(-10)

Past JEE Questions Ch.7 CHEMICAL EQUILIBRIA

JEE Question 2007 Paper II

23. Consider a reaction aG+bH--> Products. When concentration of both the reactants G and H is doubled, the rate increases by eight times. However, when concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall order of the reaction is
(A) 0
(B) 1
(C) 2
(D) 3

Solution: D

This is a question of chapter chemical kinetics.
Reason: When G alone is doubled, rate is doubled. That is the exponent of [G] is one in rate law. When both are doubled, rate increases by 8 times, telling us that exponent of [H] is 2 in rate law. So overall order of reaction is sum of the two exponents that is 3.
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