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Question

A manometer attached to a flask contains ammonia gas and has the same mercury level initially as shown in the diagram. Ammonia is partially dissociated as 2NH3(g)N2(g)+3H2(g) after which there is a difference of 4 cm in the mercury levels in the two columns. What is the partial pressure of H2(g) at equilibrium?

A
6 cm Hg
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B
9 cm Hg
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C
12 cm Hg
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D
27 cm Hg
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Solution

The correct option is A 6 cm Hg
Initially2NH3(g)N2(g)+3H2(g)Equilbrium760 0762xx 3x
Increase in pressure: 2x=4; x=2 cm Hg
Partial pressure of H2=3×2=6 cm Hg

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