Q.

In the equilibrium 

\large N{H_4}H{S_{\left( s \right)}}\,\rightleftharpoons \,N{H_{3\left( g \right)}} + {H_2}{S_{\left( g \right)}}

The forward reaction can be favoured by

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a

Adding NH3

b

Removing NH3

c

Adding H2S

d

Adding NH4HS 

answer is C.

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Detailed Solution

\large N{H_4}H{S_{\left( s \right)}}\,\rightleftharpoons \,N{H_{3\left( g \right)}} + {H_2}{S_{\left( g \right)}}

NH4HS is solid, its addition (or) removal has no influence on equilibrium state.

According to Le-Chatelier's principle

Addition of gaseous reactants (or) removal gaseous products favour forward reaction.

Removal of NH3(g) (or) H2S(g) favour forward reaction.

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