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Question

The following reactions occurs at 500K . Arrange them in order of increasing tendency to proceed to completion.
1) 2NOCI(g)2NO(g)+Cl2(g);Kp=1.7×102
2) N2O4(g)2NO2(g);Kp=1.5×103
3) 2SO3(g)SO2(g)+O2(g);Kp=1.3×105
4) 2NO2(g)2NO(g)+O2(g);Kp=5.9×105

A
2 < 1 < 4 < 3
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B
3 < 4 < 2 < 1
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C
1 < 3 < 4 < 2
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D
4 < 3 < 1 < 2
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Solution

The correct option is D 3 < 4 < 2 < 1
Equilibrium constant denotes the tendency of a reaction to go to completion. Higher the value of Kp or Kc, more is its tendency to go towards completion.
Hence, the required order is:
3<4<2<1

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