KEAM 2017 Physics and Chemistry Paper

Question : 83 of 120

Marks: +1, -0

For the process

A→B, at 298 K, ΔG0 is 163 kJ mol-1. The composition of the reaction mixture is [B] = 1 and [A] = 10000. Predict the direction of the reaction and the relation between reaction quotient (Q) and the equilibrium constant (K)

Forward direction because Q > K
Reverse direction because Q > K
Forward direction because Q < K
Reverse direction because Q < K
It is at equilibrium as Q = K

Validate

Solution:

Q=‌

∣‌ conc. of product ‌]n

[‌ conc. of reactant ‌]n

=‌

[B]

[A]

Q=‌

[10000]3/2

Also, ‌‌∆G=2.303RT‌log‌K

63.×1000=2.303×8341×298‌log‌K
∴‌‌log‌K=‌

163×1000

2.303×8.3141×298

−‌

163000

5705.8

≈28.57
i.e. K>O means
Forward reaction is favoured with $ {Q}

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