p-Block elementsHard

Question

Calcium is obtained by :

Options

A.electrolysis of molten CaCl2 
B.electrolysis of a solution of CaCl2 in water
C.reduction of CaCl2 with carbon
D.roasting of limestone

Solution

Ca2+ + 2e- → Ca (at cathode), If electrolysis is carried out in aqueous medium, H2 will be liberated instead of Ca . Because Ca. is highly electropositiyve metal, so it can′t be reduced by C.

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