A solution of aluminium chloride is electrolyzed for 30 minutes using a current 2A. The amount of aluminium deposited at the cathode is _______. [Given: molar mass of aluminium and chlorine are 27 g and 35.5 g respectively. Faraday constant = 96500 C ]

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Solution

Q.
A solution of aluminium chloride is electrolyzed for 30 minutes using a current 2A. The amount of aluminium deposited at the cathode is _______.

[Given: molar mass of aluminium and chlorine are 27 g ${mol}^{- 1}$ and 35.5 g ${mol}^{- 1}$ respectively. Faraday constant = 96500 C ${mol}^{- 1}$ ] [2025]

1 1.660 g

2 0.441 g

3 0.336 g

4 1.007 g

Ans.
(3)

Equivalent mass of Al (E) $= \frac{M}{3} = \frac{27}{3} {geq}^{- 1} = 9 {geq}^{- 1}$

Current $(I)$ = 2 A

Time $(t) = 30 min = 30 \times 60 s$

Mass of Al deposited = $\frac{E I t}{96500} = \frac{9 \times 2 \times 30 \times 60}{96500} g = 0.336 g$

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