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Standard X

Chemistry

Application of Electrolysis

In the electr...

Question

In the electrolysis of molten $A l_{2} O_{3}$ with inert electrodes:

Al is oxidized at anode to

A l^{3 +}

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O_{2}

gas is produced at anode

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O^{2 -}

is reduced at cathode

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O

is oxidized at anode

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Solution

The correct option is A $O_{2}$ gas is produced at anode
The electrodes are inert so that they do not involve the electrode reactions but transfer electrons through them. Since the silvery metal i.e. $A l$ is produced at cathode.
At cathode: $A l^{3 +} + 3 e^{-} ⟶ A l$
At anode, $O_{2}$ bubbles off.
At anode; $2 O^{2 -} ⟶ O_{2} + 4 e^{-}$
The cell reaction: $2 A l_{2} O_{3} ⟶ 4 A l + 3 O_{2}$

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Q. Match list I with list II.

List I List II

A) Electrolysis of aq. $N a_{2} S O_{4}$ using Pt electrodes	1) 1 Faraday
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C) The amount of electricity required to deposit 27 grams of Aluminium at cathode from molten $A l_{2} O_{3}$ is	3) $H_{2 (g)} /$ Pt
D) A gas in contact with an inert electrode	4) $O_{2}$ at anode $H_{2}$ at cathode

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In the electrolysis of molten Al2O3 with inert electrodes:

In the electrolysis of molten $A l_{2} O_{3}$ with inert electrodes: