Assertion (A): Zinc oxide reacts with acids as well as bases to form salt and water.

Reason (R): Zinc oxide is amphoteric in nature.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Name:

(a) two coloured metal ions.

(b) a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.

(c) two bases which are not alkalis but dissolve in strong alkalis.

(d) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

(e) a colourless cation not a representative element.

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

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

(h) a compound containing zinc in the anion.

Name the chloride of a metal which is soluble in excess of ammonium hydroxide. Write equation for the same.

What happens when ammonia solution is added first dropwise and then in excess to the following solutions:

(i) CuSO₄

(ii) ZnSO₄

(iii) FeCl₃

Write balanced equations for these reactions.