KVPY SA Exam 2013 Question Paper

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Question : 40 of 80

Marks: +1, -0

The equilibrium constant,

K_c

for

3 C _2H _2 (g) ⇌ C_6H _6 (g)

is

4 \L ^2 \mol^^{-2}

. If the equilibrium concentration of benzene is

0.5 \mol \L^{-1}

, that of acetylene in

\mol \L^{-1}

must be

0.025
0.25
0.05
0.5

Solution:

\K_c=[\C_6\H_6]/[\C_2\H_2]^3

4=0.5/[\C_2\H_2]^3

⇒[\C_2\H_2]^3=0.5/4=1/8

⇒[\C_2\H_2]=1/2=0.5

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