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Q.

The reaction A + B ⇌  C  +  D is studied in a one litre vessel at 2500C.  The initial concentration of A was 3n and that of B was n. When equilibrium was attained, equilibrium concentration of C was found to the equal to the equilibrium concentration of B. What is the concentration of D at equilibrium ?

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a

n/2

b

3n - 1/2

c

n - n/3

d

n

answer is A.

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Detailed Solution

A   +   B   ⇌    C    +    Dt = 0  ;    3n        n            0           0t =∞; 3n - x   n - x         x           xGiven [B]=[C] n-x=x  x = n2,   i.e.,  Deq. = n2
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