Name
(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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