A manometer attached to a flask contains with ammonia gas have no difference in mercury level initially as shown in diagram. After sparking into the flask, ammonia is partially dissociated as $2 {NH}_{3} (g) ⟶ N_{2} (g) + 3 H_{2} (g)$ now it have difference of 6 cm in mercury level in two columns, what is partial pressure of H₂(g) at equilibrium?

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9 cm Hg

18 cm Hg

27 cm Hg

None of these

answer is A.

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Detailed Solution

$2 {NH}_{3} (g) ⟶ N_{2} (g) + 3 H_{2} (g) Before sparking 76 0 0 After sparking 76 - 2 x x 3 x at equilibrium$
Increase in pressure 2x = 6 ; x =3 cm Hg
Partial pressure of H₂ =3 x 3 =9 cm Hg

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