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Question

Which reaction has an equilibrium constnt (KP) equal to 1?

A
PCl3(g)+Cl2(g)PCl5(g)
When: PCl3=3 atm, Cl2=4 atm, PCl5=1 atm
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B
N2(g)+3H2(g)2NH3(g)
When: N2=1 atm, H2=2 atm, NH3=4 atm
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C
I2(g)+H2(g)2HI(g)
When: I2=2 atm, H2=2 atm, HI=2 atm
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D
2SO2+O22SO3
When: SO2=2 atm, O2=2 atm, SO3=3 atm
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Solution

The correct option is C I2(g)+H2(g)2HI(g)
When: I2=2 atm, H2=2 atm, HI=2 atm
The reaction is :
I2(g)+H2(g)2HI(g)
KP=(PHI)2(PI2.PH2)
KP=2×22×2=1.

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