MHT CET · Chemistry · Electrochemistry

How many faraday of electricity are required to deposit 10 g of calcium from molten calcium chloride using insert electrodes? (Molar mass of calcium $= 40 g m o l^{- 1}$ )

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

Verified Solution

Answer & Solution

Correct Answer

(A) 0.5 F

Step-by-step Solution

Detailed explanation

2 moles of electrons are required to deposit 1 mole of calcium
Mass of calcium deposited

= 10 g

Molar mass of calcium

= 40 g m o l^{- 1}

∴ N o o f m o l e s = \frac{10}{40 g m o l^{- 1}} = 0.25 m o l

2F are required for 1 mole of calcium
'x' F are required for 0.25 mole of calcium

∴ x = 0.25 \times 2 = 0.5

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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How many faraday of electricity are required to deposit 10 g of calcium from molten calcium chloride using insert electrodes? (Molar mass of calcium =40 g mol-1 )

Step-by-step Solution

How many faraday of electricity are required to deposit 10 g of calcium from molten calcium chloride using insert electrodes? (Molar mass of calcium $= 40 g m o l^{- 1}$ )