Chemical and Ionic Equilibrium - Result Question 4

####4. For the following reactions, equilibrium constants are given :

S(s)+O2(g)SO2(g);K1=1052 2S(s)+3O2(g)2SO3(g);K2=10129

The equilibrium constant for the reaction,

2SO(g)+O2(g)2SO3(g) is 

(2019 Main, 8 April II)

(a) 1025

(b) 1077

(c) 10154

(d) 10181

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Answer:

Correct Answer: 4. (c)

Solution:

  1. S+O2SO2,K1

SO2S+O2,K1=1K1

or, 2SO22S+2O2,K1=(K1)2=1K12

2S+3O22SO3,K2

Now, [(i) + (ii) ] gives

2SO2+O22SO3,K3

The value of equilibrium constant,

K3=K2×K1=K2×1K12 =10129×1(1052)2=10129104=1025



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