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Standard XII

Chemistry

Faraday's First Law

What amount o...

Question

What amount of electricity can deposit $1$ mole of $A l$ metal at cathode when passed through molten $A l C l_{3}$ ?

0.3 F

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1 F

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3 F

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\frac{1}{3} F

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Solution

The correct option is C $3 F$
$A l C l_{3} \to A l^{3 +} + 3 C l^{-}$

At cathode:

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

$3$ mole of electrons corresponds $3 F$ charge

So, required charge $= 3 F$

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What amount of electricity can deposit 1 mole of Al metal at cathode when passed through molten AlCl3?

The correct option is C 3 FAlCl3→Al3++3Cl−At cathode: Al3++3e−→Al3 mole of electrons corresponds 3 F chargeSo, required charge =3 F

What amount of electricity can deposit $1$ mole of $A l$ metal at cathode when passed through molten $A l C l_{3}$ ?

The correct option is C $3 F$
$A l C l_{3} \to A l^{3 +} + 3 C l^{-}$

At cathode:

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

$3$ mole of electrons corresponds $3 F$ charge

So, required charge $= 3 F$