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(a) A bottle of liquor ammonia should be...

(a) A bottle of liquor ammonia should be cooled before opening. Give reason.
(b) Why cone. `H_2 SO_4`, anhydrous `CaCl` and `P_4 O_10` cannot be used as dehydrating agents for ammonia.

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(a) Liquor ammonia hsd high vapour pressure at room temperature. Hence, to reduce the vapour pressure inside the bottle in order to avoid bumping, it has to be cooled.
(b) Conc. `H_2 SO_4`, anhydrous `CaCl_2`and `P_4 O_10` react with ammonia and hence do not behave as dehydrating agent.
`H_2 SO_4 + 2 NH_3 rarr (NH_4)_2 SO_4`
`CaCl_2 + 8 NH_3 rarr CaCl_2. 8 NH_3`
`P_4 O_10 +12 NH_3 + 6 H_2 O rarr 4(NH_3)_3 PO_4`.
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