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.

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Solution

(a) A yellow monoxide that dissolves in a hot, concentrated alkali: Lead monoxide, PbO.
(b) An insoluble white oxide that dissolves when fused with caustic soda or caustic potash: Aluminium oxide, ${Al}_{2} O_{3}$

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