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On adding NH4HS in following equilibrium...

On adding `NH_4HS` in following equilibrium `NH_4HS(s)` `leftrightarrow` `NH_3(g)+H_2S(g) `

A

Total pressure in container increases

B

Partial pressure of `NH_3` increases, but partial pressure of `H_2S` decreases

C

`K_p` increases

D

No effect is observed

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