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A manometer attached to a flask contains, NH3 gas have no difference in mercury level initially

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A manometer attached to a flask contains, NH3 gas have no difference in mercury level initially as shown in diagram After the sparking into the flask, it have difference of 19 cm in mercury level in two columns Calculate % dissociation. 

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After sparking → due to reaction, number of moles increases

∴ Pressure gas (V and T are constant)

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