Name a white insoluble oxide that dissolves in hot and concentrated caustic alkali.

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Solution

Part 1: Name of oxide
ZnO (Zinc oxide) is the white insoluble oxide that dissolves in hot and concentrated caustic alkali (conc.NaOH).
Part 2: Balanced reaction with NaOH
$ZnO (s) + 2 NaOH (aq) \overset{∆}{\to} {Na}_{2} {ZnO}_{2} (aq) + H_{2} O (l) (Zinc oxide) (Conc . Sodium hydroxide) (Sodium zincate) Water (White) (Colourless, soluble)$
Final answer - Zinc oxide is a white insoluble oxide that dissolves in hot and concentrated caustic alkali.

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Q. 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.

Name:
(a) A yellow monoxide that dissolves in hot and concentrated alkali.
(b) A white insoluble oxide that dissolves when fused with caustic soda or caustic potash.

Name:

(a) A yellow monoxide that dissolves in hot and concentrated caustic alkali.

(b) A white, insoluble oxide that dissolves when fused with caustic soda or caustic potash.

Name a yellow monoxide that dissolves in hot and concentrated caustic alkali.

Name a white insoluble oxide that dissolves when fused with caustic soda or caustic potash.

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