How many Faradays of electricity are required to deposit 10 g of calcium from molten calcium chloride using inert electrodes ?
( molar mass of calcium = `40 g mol^(-1)`)

Options

A. 0.5 F
B. 1 F
C. 0.25 F
D. 2 F

Answer

A

Explanation

`CaCl_(2) overset(delta)to Ca^(2+)+2Cl^(-)`
At cathode `Ca^(2+)+2e^(-) to Ca`
For one mole (i.e. 40 g) `Ca^(2+)` to deposit requires 2F of electricity then for 10g it will be 0.5 F of electricity.