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The reaction A + B hArr C + D is studied...

The reaction `A + B hArr C + D` is studied in a one litre vessel at `250^(@)C` . 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 ?

A

(A) `n//2`

B

(B) `(3n-1//2)`

C

(C) `(n-n//3)`

D

(D) `n`

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