Explain why the following statements are not correct: [4 MARKS]
(a) Nitrogen can be obtained in the pure state by removing $C O_{2}$ and $O_{2}$ from air.
(b) Ammonium salts, on heating, give ammonia.

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Solution

Each Part: 2 Marks

(a) Nitrogen cannot be obtained in the pure state by removing $C O_{2}$ and $O_{2}$ from air because the nitrogen so obtained contains noble gases (about 1% by volume).
(b) Ammonium salts decompose to give ammonia only when they are heated with caustic alkali such as slaked lime $[C a (O H)_{2}]$ or caustic soda (NaOH) or caustic potash (KOH).

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