Question

Reduction is a gain of electrons.
If true enter 1, else enter 0.

• A. 1

Answer 1

The correct option is A 1
Reduction is gain of electrons by an atom or an ion.
Due to this, the oxidation number of metal decreases.
For examples, cupric ions gain one electron and are reduced to cuprous ions as shown in the reaction below:
$C{u}^{2+}+e^{-}\to C{u}^{+}$
Hence, the oxidation number of copper decreases from $+2$ to $+1$.