Question

How would you distinguish between the following pairs of substances on the basis of the chemical tests given in brackets? (1)Sodium Chloride and Potassium Chloride (flame test) (2) Zinc Carbonate and Lead Carbonate (dry heating)​

Answer 1

Answer:

Sodium nitrate gives colourless vapours of nitric acid which condenses to from nitric acid. Sodium sulphite gives colourless gas with smell of burning sulphur which is acidic in nature which means that SO 2

is released.

Answer 2

Answer:

(1) Dil a glass rod in diluted and acidified paste of the salt and burn in flame if gives lilac color them potassium chloride if golden yellow then sodium chloride

(2) Heat the hydrated salt

ZnCO3 + heat - ZnO (white) + heat - ZnO ( yellow )

PbCO3 + heat - PbO (yellow)+ heat - PbO (red)