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Question

The reaction A+BC+D is studied in a one litre vessel at 250C. The initial concentration of A was 3n and that of B was n. When equilibrium was attained, the equilibrium concentration of C was found to the equal to the equilibrium concentration of B.


What is the concentration of D at equilibrium :

A
n/2
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B
(3n - 1/2)
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C
(n - n/3)
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D
n
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Solution

The correct option is D n/2
A+BC+D
t=0 3n n 0 0
t= 3n-x n-x x x

nx=x

2x=n

x=n2 i.e.[D]eq.=n2

So, the correct option is A

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