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In which one of the following equilibria...

In which one of the following equilibria `Delta n_(g)` value is zero?

A

`2NOCl(g) hArr 2NO(g) + Cl_(2)(g)`

B

`NI(s) + 4CO(g) hArr Ni(CO)_(4)(g)`

C

`CO_(2)(g) + C(s) hArr 2CO(g)`

D

`H_(2)(g) + Br_(2)(g) harr 2HBr(g)`

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The correct Answer is:
D
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