Question

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.
(c) a compound containing zinc in the anion.​

Answer 1

(a) PbO

(b) ZnO

(c) K2ZnO2

Answer 2

a) A yellow monoxide that dissolves in hot and concentrated caustic alkali is PbO (Lead (II) oxide).

When heated, PbO appears orange, while when cool, it appears buff-yellow. The tetragonal form is red or orange, whereas the orthorhombic form is yellow or orange.

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

ZnO is an inorganic chemical used in a variety of manufacturing processes. Because it is an amphoteric molecule, it may be acidic and basic, depending on the circumstances.

c) A compound containing zinc in the anion is K₂ZnO₂ (Potassium Zincate).

K₂ZnO₂ is a chemical with zinc as its anion. Other examples include Na₂ZnO₂ (Sodium Zincate), Aluminum Zincate, and a variety of others.