The electrochemical equivalent of a metal is 3.3 × 10⁻⁷ kg per Coulomb. The mass of the metal liberated at the cathode when a 3 A current is passed for 2 seconds will be (a) 6.6 × 10⁻⁷ kg (b) 9.9 × 10⁻⁷ kg (c) 19.8 × 10⁻⁷ kg (d) 1.1 × 10⁻⁷ kg

Answer: (c). m = ZIt. m = 3.3 × 10⁻⁷ × 3 × 2 = 19.8 × 10⁻⁷ kg. So the answer is (c) 19.8 × 10⁻⁷ kg.

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Electrical Power & Heating Effect

The electrochemical equivalent of a metal is $3.3 \times 10^{-7}\text{ kg}$ per Coulomb. The mass of the metal liberated at the cathode when a $3\text{ A}$ current is passed for $2$ seconds will be

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Answer: (c)

$m = ZIt$ .
$m = 3.3 \times 10^{-7} \times 3 \times 2 = 19.8 \times 10^{-7}\text{ kg}$ .
So the answer is (c) $19.8 \times 10^{-7}\text{ kg}$ .

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