Question

How would you distinguish between the following pairs of substances on the
basis of the chemical tests given in brackets?
(i)Sodium Chloride and Potassium Chloride (flame test)
(ii) Zinc Carbonate and Lead Carbonate (dry heating)​

Answer 1

Answer:

1. On heating sodium chloride in a non luminous flame of a burner, the flame turns Golden yellow(persistent) whereas on heating potassium chloride in a non luminous flame, the flame turns lilac (non-persistent)
2. Zinc Carbonate on heating gives a compound which is yellow when hot and white when cold. Lead Carbonate on heating gives a buff yellow compound which decrepitates, melts and fuses with the glass.

Explanation: