Question

The amount of substance deposited due to passage of $1\text{F}$ of electricity is called

• A. Atomic weight
• B. Equivalent weight
• C. Electrochemical equivalent
• D. Molecular weight

Hint:

Don't confuse "Equivalent weight" with "Electrochemical equivalent ($z$)."

• Equivalent weight: Deposited by $1\text{ Faraday}$ ($96500\text{ C}$).

• Electrochemical equivalent: Deposited by 1 Coulomb ($1\text{ Ampere}$ for $1\text{ second}$).

Answer 1

The Correct Option is B

1. Faraday's Second Law: The law states that when the same quantity of electricity is passed through different electrolytes, the masses of the substances deposited are proportional to their chemical equivalent weights ($E$).

2. Defining the Faraday ($1\text{F}$): $1\text{ Faraday}$ ($96500\text{ C}$) is the charge carried by one mole of electrons.

3. Theoretical Relationship: According to the formula $m = \frac{E \cdot Q}{96500}$: If we pass exactly $Q = 96500\text{ C}$ (which is $1\text{F}$): $$m = \frac{E \cdot 96500}{96500} = E$$ Therefore, the mass of the substance deposited by $1\text{ Faraday}$ of electricity is numerically equal to its

Equivalent weight.