Aluminium oxide may be electrolysed at 1000oC to furnish aluminium metal- The cathode reaction is Al3-3e- Al- To prepare 5-12 kg of aluminium metal by this method would require-

The correct option is C 5.49×10^7 C of electricityMass of Al deposited = #160;5.12 kg #160;= #160; #160;5.12 #160;× #160; 10 ^ ...

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Byju's Answer

Standard XII

Chemistry

Faraday's First Law

Aluminium oxi...

Question

Aluminium oxide may be electrolysed at $1000^{o} C$ to furnish aluminium metal. The cathode reaction is $A l^{3 +} + 3 e^{-} \to A l$ . To prepare $5.12 k g$ of aluminium metal by this method would require:

5.49 \times 10^{1} C

of electricity

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5.49 \times 10^{4} C

of electricity

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1.83 \times 10^{7} C

of electricity

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5.49 \times 10^{7} C

of electricity

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Solution

The correct option is C $5.49 \times 10^{7} C$ of electricity
Mass of Al deposited $= 5.12 k g = 5.12 \times 10^{3} g m$
Mass of Al deposited $= \frac{Q (C)}{96500 \frac{C}{m o l e^{-}}} \times mole ratio \times molar mass$ .
Substituting the mass of Al deposited in the above equation:

$5.12 \times 10^{3} g = \frac{Q (C)}{96500 \frac{C}{m o l e^{-}}} \times \frac{1 m o l A l}{3 m o l e^{-}} \times 27 \frac{g}{m o l}$
$Q (C) = 5.49 \times 10^{7} C .$

Hence, option D is correct.

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Similar questions

Q. Aluminium oxide may be electrolysed at

1000^{\circ} C

to furnish aluminium metal (Atomic mass

= 27 a m u; 1 f a r a d a y = 96500 c o u l o m b

). The cathode reaction is:

A l^{3 +} + 3 e^{-} \to A l

To prepare

5.12 k g

of aluminium metal by this method we would require.

Aluminium oxide may be electrolyte at 1000 $^{0}$ C to furnish aluminium metal (Atomic mass = 27 amu, 1 Faraday = 96,500 Coulombs). The cathode reaction is $A l^{3} + 3 e^{-} \to A l^{o}$ . To prepare 5.12 kg of aluminium metal by this method would require:

On passing 0.1 Faraday of electricity through aluminium chloride, the

amount of aluminium metal deposited on cathode is

[MP PMT 1991]

Q. The amount of electricity required to deposit 0.9gof aluminum the electrode reaction is

A l^{3 +} + 3 e^{-} \to A l

(atomic mass of Al = 27)

Q. How many faradays of electricity are required to produce

13

gram of aluminium from aluminium chloride solution? (Given: Molar mass of

A l = 27.0

gram

m o l^{- 1}

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Aluminium oxide may be electrolysed at 1000oC to furnish aluminium metal. The cathode reaction is Al3++3e−→Al. To prepare 5.12 kg of aluminium metal by this method would require:

Aluminium oxide may be electrolysed at $1000^{o} C$ to furnish aluminium metal. The cathode reaction is $A l^{3 +} + 3 e^{-} \to A l$ . To prepare $5.12 k g$ of aluminium metal by this method would require: