Question

A copper voltameter is used to determine the electrochemical equivalent of _______.
(A) metal
(B) copper
(C) A current
(D) A charge

Answer 1

Hint : In order to solve this question, we are going to see what an electrochemical equivalent is and what function a copper voltameter has. After that it is analyzed as to which element’s electrochemical equivalent measurement, the copper voltameter is generally used.
The electrochemical equivalent for an element is given by
$Z{\text{ }} = {\text{ }}\dfrac{{Equivalent{\text{ }}weight}}{{96,485}}$

Complete Step By Step Answer:
A copper voltameter is used to determine the electrochemical equivalent of copper. The scientific instrument used for measuring the quantity of electricity through electrolytic action is a voltmeter or coulometer.
For electric charge measurements, the SI unit is coulomb
The voltmeter should not be confused with a voltmeter as it measures the electric potential.
The electrochemical equivalent is sometimes abbreviated as $Z$ .
The electrochemical equivalent for an element is given by
$Z{\text{ }} = {\text{ }}\dfrac{{Equivalent{\text{ }}weight}}{{96,485}}$
For a chemical element, an electrochemical equivalent is defined as the mass of that element (in grams) transported by $1$ coulomb of electricity. The electrochemical equivalent is measured with a voltmeter. And the element whose electrochemical equivalent is measured using this instrument, i.e. copper voltameter is copper only
Hence, option (B) A copper is the correct answer.

Note :
A voltmeter is of the following types:
-Silver voltameter
-Copper voltameter
-Mercury voltameter
-Sulphuric acid voltameter
Coulometers can be devices that are used to determine an amount of substance by measuring the charges. The devices do a quantitative analysis. This method is called coulometry.