Question

Give reasons for the following :
(a) Alumina is dissolved in cryolite for electrolysis instead of being electrolyzed directly.
(b) Zinc oxide can be reduced to metal by heating with carbon but Cr2O2 cannot be reduced by heating with carbon​

Answer 1

Answer:

(a) Lumina is dissolved in cryolite for electolysis instead of being electolyzed directly why. Because cryolite decrease the melting point of the mixture from 2323 K to 1140 K and it also increases the electrical conductivity of Al2O3. Thus it help in efficient electrolysis of alumina.

(b) Oxides of moderates reactive metals such as Zn can be reduced by carbon because carbon has more affinity for oxygen than zinc due to which ZnO is reduced to Zn and carbon combines with oxygen to form CO.

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Answer 2

Answer:

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