Q65 / 180 · NEET 2020 (Phase 1) · Chemistry

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
$4$
Correct answer
D
$1$

Solution

{Ca}^{+ 2} + 2 e^{-} \to Ca (s)

Valency Factor

= 2

As per Faraday's

1^{st}

law, Charge passed in Faraday

=

Number of gram equivalent of product.

= \frac{20}{40} \times 2 = 1 F

Hence, the correct answer is option: 'D'.

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