Question

What happens-
(i) Molten alumina is electrolysed
(ii) Silver bromide is kept in sunlight
(iii) Magnesium carbonate is heated

Answer 1

Answer:

(i) Molten alumina is electrolysed

Ans- Pure alumina is a bad conductor of electricity. The fusion temperature of pure alumina is about 2000∘C and at this temperature when electrolysis is carried out on the fused mass, the metal formed vaporizes, as the boiling point of aluminium is 1800∘C.

(ii) Silver bromide is kept in sunlight

Ans- When silver bromide is exposed tosunlight, decomposition reaction takes place, which results in the formation ofsilver and bromide gas. This is an example of photolytic decomposition reaction.

(iii) Magnesium carbonate is heated.

Ans- MgCO3, when heated to an elevated temperature, decomposes when magnesium carbonate. After a 20.29 g sample of impure carbonate was reacted, 15.90 g of impure strong MgO material was left after decomposition.

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