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When a current I was passed through an electrolyte solution for 40 minutes, a ma...


Question

When a current I was passed through an electrolyte solution for 40 minutes, a mass X g of a univalent metal was deposited at the cathode. What mass of the metal will be deposited when a current 2I is passed through the solution for 10 minutes?

Options

A) X/4 g

B) X/2 g

C) 2X g

D) 4X g


The correct answer is B.

Explanation:

From M = zit
Where M = to the mass of the metal liberated
z = Is the electrochemical equivalent
∴ X g = 1 * 1 * 40 * 60
X g = 2400 I
Let Y represent the new mass
Y = 1*2I * 10 * 60
Y = 1200 I
Y/(X g) = 1200 I/2400 I
Y = X/2 g

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Dicussion (1)

  • From M = zit
    Where M = to the mass of the metal liberated
    z = Is the electrochemical equivalent
    ∴ X g = 1 * 1 * 40 * 60
    X g = 2400 I
    Let Y represent the new mass
    Y = 1*2I * 10 * 60
    Y = 1200 I
    Y/(X g) = 1200 I/2400 I
    Y = X/2 g

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