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Question

In which one of the following reactants, Kp is less than Kc?

A
2SO3(g)2SO2(g)+O2(g)
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B
N2(g)+3H2(g)2NH3(g)
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C
PCl5(g)PCl3(g)+Cl2(g)
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D
H2(g)+I2(g)2HI(g)
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Solution

The correct option is B N2(g)+3H2(g)2NH3(g)
Kp is less than KC forN2(g)+3H2(g)2NH3(g)
n = number of moles of gaseous products - number of moles of gaseous reactants
n=2(2+1)
n=1
Kp=Kc(RT)n
KpKc(RT)1
Kp=KcRT
RT>1
1RT<1
Kp<Kc

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