Match the followings.

Column 1	Column 2
Reaction of hydrogen sulphide with chlorine	Reduction
Splitting of water into hydrogen and oxygen	Oxidation
Reaction of copper oxide with carbon.	Electrolysis
Formation of hydrogen from water and coke.(carbon)	Bosch process

(A) Reaction of hydrogen sulphide with chlorine- (II) Oxidation

Definition of oxidation.

It 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.

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

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

(B) Splitting of water into hydrogen and oxygen - (III) Electrolysis

Electrolysis is the process of splitting up a solution (electrolyte) into its constituents by passing an electric current through it.

(C) Reaction of copper oxide with carbon - (I) Reduction

Definition of reduction.

It is the reverse of oxidation. ie. removal of oxygen or the addition of hydrogen to an element or a compound.

Removal of oxygen.

$$\begin{gathered} \mathrm{CuO}+\mathrm{C}\to \mathrm{Cu}+\mathrm{CO} \\ \mathrm{Copper}\mathrm{oxide}\mathrm{carbon}\mathrm{copper}\mathrm{Carbon}\mathrm{monoxide} \end{gathered}$$

Addition of hydrogen.

${\mathrm{N}}_2+3{\mathrm{H}}_2\to 2{\mathrm{NH}}_3$

Redox reaction

(D) Formation of hydrogen from water and coke. (carbon) -(IV) Bosch process

Hydrogen is produced industrially by the process called Bosch process.

$$\begin{gathered} \mathrm{C}+{\mathrm{H}}_2\mathrm{O}\stackrel{{1200}^0\mathrm{C}}{\to }(\mathrm{CO}+{\mathrm{H}}_2)+{\mathrm{H}}_2\mathrm{O}\stackrel{\mathrm{iron}\mathrm{chromate}}{\to }(\mathrm{CO}+{\mathrm{H}}_2) \\ \mathrm{Coal}\mathrm{Steam}\mathrm{water}\mathrm{gas}30\mathrm{atm}\downarrow \mathrm{cold}\mathrm{water} \\ {\mathrm{CO}}_2+{\mathrm{H}}_2 \end{gathered}$$

Column I	Column II
The reaction of hydrogen sulphide with chlorine	Oxidation
Splitting of water into hydrogen and oxygen	Electrolysis
The reaction of copper oxide with carbon.	Reduction
Formation of hydrogen from water and coke. (carbon)	Bosch process