Question

The unit for Electrochemical Equivalent is
A. Coulomb per gram
B. gram per Coulomb
C. Coulomb per sq.cm
D. gram per 1Ampere

Answer 1

Hint: The electrochemical equivalent, sometimes abbreviated $$Eq$$ or $$Z$$, of a chemical element is the mass of that element (in grams) transported by 1Coulomb of electric charge. The electrochemical equivalent of an element is measured with a voltmeter.
the weight of a substance (such as an element) deposited or evolved during electrolysis by the passage of a specified quantity of electricity and usually expressed in gram per Coulomb, the value for silver as the usual standard being $$0.001118gram$$.

Complete step by step answer:Electrochemical equivalent is the mass deposited in electrolysis by passage of 1 Coulomb of charge.
The electrochemical equivalent of a substance may be defined as the mass of the substance deposited to one of the electrodes when a current of 1 Ampere is passed for 1 second, i.e. a quantity of electricity of 1 Coulomb is passed.
The formula for finding electrochemical equivalent is as follows:
$$Z={\displaystyle \frac{M}{q}}$$
where, '$$M$$' is the mass of substance and
'$$q$$' is the charge passed.
Hence, its S.I. unit is gram per Coulomb
Also $$q=it$$
Hence, $$Z={\displaystyle \frac{M}{it}}$$
where ' $$i$$' is the current applied and
'$$t$$' is the time.

Hence, the correct option is B.

Note:Electrochemical equivalent is totally differ from chemical equivalent. Electro-chemical equivalent is the ratio between chemical equivalent weight and the Faraday number it's representation formula is Electrochemical equivalent $$={\displaystyle \frac{E}{F}}$$. It is that mass of the substance due to passage of deposited or removed by the process of electrolysis. Electrochemical equivalent: Electrochemical equivalent on the other hand, refers to the mass of substance deposited when a current of 1 Ampere is passed for 1 second during electrolysis. (or the mass of a substance deposited when 1 Coulomb of electricity is passed through).
While the chemical equivalent is the weight of the 1 gram of substance that can combine with or displace with $$1g$$ of the hydrogen. Formula $${\displaystyle \frac{weight}{valency}}$$ is the chemical formula. Chemical equivalent of an element is the value obtained by dividing the atomic weight of the given element by its valency.