Question

The reaction in which oxidation and reduction occurs simultaneously is called.

• A. Electrolysis
• B. Redox
• C. Oxidation
• D. Ionisation

Answer 1

The correct option is B

Redox

Explanation for correct option.

(B) - Redox

When oxidation-reduction takes place simultaneously in a reaction it is called a redox reaction.

$$\begin{gathered} \hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\mathrm{Reduction}(\mathrm{removal}{\mathrm{ofO}}_{2)} \\ \mathrm{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_} \\ \downarrow \downarrow \\ \mathrm{CuO}+{\mathrm{H}}_2\to \mathrm{Cu}+{\mathrm{H}}_2\mathrm{O} \\ \downarrow \mathrm{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}\uparrow \\ \mathrm{Oxidation}(\mathrm{addition}\mathrm{of}{\mathrm{O}}_2) \end{gathered}$$

Explanation for incorrect options.

(A) - Electrolysis

Electrolysis is a process of splitting of water solution into its constituents by passing an electric current through it.

Electrolysis of water: It refers to the splitting of water (${\mathrm{H}}_2\mathrm{O}$) into oxygen (${\mathrm{O}}_2$) and hydrogen gas (${\mathrm{H}}_2$) when an electric current is passed through water.

(C) - Oxidation

Oxidation is defined as a chemical process that involves the addition of oxygen or removal of hydrogen from an element or a compound in a reaction.

Definition of oxidation.

It is defined as a chemical process that involves the addition of oxygen or the removal of hydrogen from an element or a compound in a reaction.

Addition of oxygen

$$\begin{gathered} 4\mathrm{Fe}+3{\mathrm{O}}_2\to 2{\mathrm{Fe}}_2{\mathrm{O}}_3 \\ \mathrm{iron}\mathrm{oxygen}\mathrm{iron}\mathrm{oxide} \end{gathered}$$

Removal of hydrogen

$$\begin{gathered} {\mathrm{H}}_2\mathrm{S}+{\mathrm{Cl}}_2\to 2\mathrm{HCl}+\mathrm{S} \\ \mathrm{Hydrogen}-\mathrm{Chlorine}\mathrm{Hydrogen}-\mathrm{Sulphur} \\ \mathrm{sulphide}\mathrm{sulphide} \end{gathered}$$

(D) Ionisation.

Ionisation is defined as the process in which an atom or molecule acquires a positive or negative charge by gaining or losing electrons by chemical changes is called ionisation.

Therefore option (B) is the correct answer. ie., redox