Question

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.

Answer 1

(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, ${\mathrm{Al}}_2{\mathrm{O}}_3$