Name:
(a) A metallic hydroxide soluble in excess of ${NH}_{4} OH$ .
(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 colourless metal ions.
(g) Two bases which are not alkalis but dissolve in strong alkalis.
(h) A metal that evolves a gas which burns with a pop sound when boiled with alkali solutions. (Also give balanced equation).
(i) A coloured metallic oxide which dissolves in alkalis to yield colourless solution. (Also give balanced chemical equation).
(j) A chocolate brown oxide which becomes colourless on addition of hot caustic soda solution. (Also give balanced chemical equation).

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Solution

(a) Zinc Hydroxide, $Zn {(OH)}_{2}$ or Copper Hydroxide $Cu (OH)_{2}$ is soluble in excess of $NaOH$ .
(b) Zinc Oxide, $ZnO$ is a metallic oxide soluble in excess of caustic soda solution.
(c) Sodium Hydroxide, $NaOH$ is an example of strong alkali.
(d) Calcium Hydroxide, $Ca {(OH)}_{2}$ is a weak alkali.
(e) Ferrous ion $(F^{2 +})$ , Cupric ion $({Cu}^{2 +})$ are two coloured metal ions.
(f) Calcium ion $({Ca}^{2 +})$ , Zinc ion $({Zn}^{2 +})$ are the ions which are colorless in nature.
(g) Lead (II) Hydroxide $[Pb {(OH)}_{2}]$ , Zinc Hydroxide $[Zn {(OH)}_{2}]$ are the two bases which are not alkalis but dissolve in strong alkalis.
(h) Zinc $(Zn)$ is the metal that evolves a gas that burns with a pop sound when boiled with alkali solutions.
The balanced equation is: $Zn + 2 NaOH \to {Na}_{2} {ZnO}_{2} + H_{2}$
(i) Lead (IV) oxide, $PbO$ (yellow in colour) is the etallic oxide which dissolves in alkalis to yield colourless solution.
The balanced equation is: $PbO + 2 NaOH \to {Na}_{2} {PbO}_{2} + H_{2} O$
(j) Lead (IV) oxide, ${PbO}_{2}$ (chocolate brown in colour) becomes colourless on addition of hot caustic soda solution.
The balanced equation is: ${PbO}_{2} + 2 NaOH \to {Na}_{2} {PbO}_{2} + H_{2} O$

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