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Calcination

Which one of ...

Question

Which one of the following processes is/are not used, for the manufacture of calcium?

Reduction of CaO with carbon

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Reduction of CaO with hydrogen

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Electrolysis of a mixture of an hydrous

C a C l_{2}

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Electrolysis of molten

C a (O H)_{2}

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Solution

The correct options are
A Reduction of CaO with carbon
B Reduction of CaO with hydrogen
D Electrolysis of molten $C a (O H)_{2}$
Electrolysis of $C a C l_{2}$ : $C a C l_{2} \to C a^{+ 2} + 2 C l^{-}$ .
The anode reaction is $2 C l^{-} \to C l_{2} + 2 e^{-}$ .
The cathode reaction is $C a^{2 +} + 2 e \to C a (s)$ .
So only Electrolysis of a mixture of an hydrous $C a C l_{2}$ is used for the preparation of Ca.
Hence options A,B & D are correct.

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