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The number of Faradays ($F$) required to produce 20 g of calcium from molten $CaCl_2$ (Atomic mass of Ca = $40\ g\,mol^{-1}$) is:
A
2
B
3
C
4
D
1
Detailed Solution
1 equivalent of any substance is deposited by 1 F of charge.
Equivalent mass of Ca $= \frac{40}{2} = 20$ g
Number of equivalents in 20 g $= \frac{20}{20} = 1$
So 1 F is required.