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Question

A flask containing 0.5 atm pressure of A2(g), some solid AB added into flask which undergoes dissociation according to 2AB(s)A2(g)+B2(g), Kp=0.06 atm2
The total pressure (in atm) at equilibrium is:

A
0.70
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B
0.6
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C
0.10
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D
none of these
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Solution

The correct option is A 0.70
According to the equation
2AB(s)A2(g)+B2(g)
Hence the pressure will be 0.5+x and x for A2 and b2 respectively.
Therefore,
Kp=pA2.pB2
0.06=(0.5+x)(x)
x=0.1
Hence total pressure
p(total)=pA2+pB2
=(0.5+0.1)+0.1=0.70atm

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