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

What is observed when hot concentrated caustic soda solution is added to (a) Zinc and (b) Aluminium oxide ? Write balanced equations.

Name :

(a) a metallic hydroxide soluble in excess of $N{H}_{4}OH$.
(b) a metallic oxide soluble in excess of caustic soda solution. (c) a strong alkali.
(d) a weak alkali.
(e) two colourless metal ions.
(f) two coloured metal ions.
(g) a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
(h) two bases which are not alkalis but dissolve in strong alkalis. (i) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
(j) a colourless cation, not a representative element.