Question

The electrochemical equivalent $\text{Z}$ of any element can be obtained by multiplying the electrochemical equivalent of hydrogen with
A. Atomic weight
B. Molecular weight
C. Chemical equivalent
D. A constant

Answer 1

Hint: According to Faraday’s second law of electrolysis, the electrochemical equivalent of a substance is directly proportional to its respective chemical equivalent. By using this law we can determine the value of the electrochemical equivalent, $Z$ of any element.

Formula used: Mathematical expression of Faraday’s second law is:
$\dfrac{{{\text{Z}}_{\text{1}}}}{{{\text{Z}}_{\text{2}}}}\text{=}\dfrac{{{\text{E}}_{\text{1}}}}{{{\text{E}}_{\text{2}}}}$
Here ${{Z}_{1}}\And {{Z}_{2}}$ are the electrochemical equivalent of substances $1\And 2$
${{E}_{1}}\And {{E}_{2}}$ are chemical equivalents of deposited substances$1\And 2$
Electrochemical equivalent,$Z=\dfrac{M}{F\times {{n}_{f}}}$
Here $M=$ Atomic weight of the deposited substance
$F=$ Faraday and ${{n}_{f}}=$ n-factor

Complete Step by Step Answer:
The electrochemical equivalent is defined by the mass of a chemical substance deposited or evolved during the process of electrolysis by the passage of a certain amount of current and it is usually expressed in grams per coulomb.
Let another element is $X$
According to Faraday’s second law of electrolysis, $\dfrac{{{Z}_{X}}}{{{Z}_{H}}}=\dfrac{{{E}_{X}}}{{{E}_{H}}}$
${{Z}_{X}}=\dfrac{{{E}_{H}}}{{{E}_{X}}}\times {{Z}_{H}}$
The electrochemical equivalent of any other element(X) is obtained by multiplying the electrochemical equivalent of Hydrogen with the chemical equivalent.
Thus, the correct option is (C).

Additional information: Electrolysis is a method in which electrical energy is converted to chemical energy through a chemical reaction. The electrolysis process is used widely in metallurgical processes for example purification or extraction of metals from ores and deposition of metals from solution. Other applications of electrolysis are electroplating, manufacturing of chemicals, electro-deposition of rubber, electro-facing, anodizing, etc.

Note: Faraday’s law of electrolysis is used to express quantitative magnitudes of electrolytic effects. Faraday’s second law of electrolysis is very useful for the calculation of chemical equivalents of different electrolysis. During the electrolysis process, the amount of substances oxidized or reduced at the respective electrodes.