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Question

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(a) a metallic hydroxide soluble in excess of NH4OH.
(b) a metallic oxide soluble in excess of caustic soda solution.
(c) a strong alkali
(d) a weak alkali
(e) two coloured metal ions.
(f) two bases which are not alkalis but dissolve in strong alkalis.
(g) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

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Solution

Disclaimer: Any one of substances mentioned below are sufficient to answer this question.

(a) Metallic hydroxides soluble in excess of NH4OH are, Zn(OH)2 and Cu(OH)2.

(b) Metallic oxides soluble in excess of caustic soda solution is lead oxide, PbO, Al2O3 and ZnO.

(c) Strong alkali are NaOH and KOH.

(d) Weak alkali is NH4OH.

(e) Coloured metal ions are Cr3+ (green), Fe2+(green), Fe3+ and ​Cu2+.

(f) Bases that are not alkalis but dissolve in strong alkalis are Al(OH)3, Pb(OH)2 and Zn(OH)2. These hydroxides are amphoteric in nature.

(g) A coloured metallic oxide that dissolves in alkalis to yield colourless solutions is lead oxide. It is yellow in colour; on dissolution in alkalis such as NaOH, it yields colourless solutions.


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