The diagram shows an experimental set-up for the laboratory preparation of a pungent smelling gas. The gas is alkaline in nature.

(i) Name the gas collected in the jar.
(ii) Write the balanced equation for the above preparation.
(iii) How is the gas being collected?
(iv) Name the drying agent used.
(v) How will you find that the jar is full of gas?

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Solution

(i) The gas collected in the jar is ammonia.
(ii) $2 {NH}_{4} Cl + Ca {(OH)}_{2} \overset{∆}{\to} {CaCl}_{2} + 2 H_{2} O + 2 {NH}_{3}$
(iii) The gas is collected by the downward displacement of air.
(iv) Quicklime is used as the drying agent.
(v) When the jar is full of ammonia, small amounts of gas emerge from the jar and a strong smell of ammonia is detected.

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