1.

Statement-1:In the electrolytic reduction of Al_(2)O_(3), cryolite lowes the melting point of the mixture and bring conductivity: Statement-2: Cryolite is an ore of aluminium.

Answer»

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.
Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.
Statement-1 is True, Statement-2 is False.
Statement-1 is True, Statement-2 is True.

Solution :Statement-1: Cyrolite as impurity reduces the MELTING point of `Al_(2)O_(3)` from 2200K to approximately 930K and being ionic compound dissociates to give ions which bring about the conductivity of the electrolyte.
Statement-2: CRYOLITE is `Na_(2)AlF_(4)` and is ore of aluminium. Therefore, (b) is correct.


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