Which of the following is used in the preparation of chlorine ?
A. Only $Mn{{O}_{2}}$
B. Only $KMn{{O}_{4}}$
C. Both $Mn{{O}_{2}}$and $KMn{{O}_{4}}$
D. Either $Mn{{O}_{2}}$and $KMn{{O}_{4}}$

Hint: In this question, we have to choose the option which is used in the preparation of chlorine. Chlorine is used in our daily life. It is used in the home as well as in the laboratories. It is prepared with the help of either $Mn{{O}_{2}}$ and .$KMn{{O}_{4}}$. It can also be prepared by other methods.

Complete Step by Step Solution:
We know chlorine exists as a yellow-green gas at room temperature. It has a pungent, irritating smell similar to bleach that is detectable at low concentrations. The density of chlorine gas is approximately 2.5 times greater than air, which will tend to initially remain near the ground in areas with little air movement.

Chlorine is not flammable, but may react explosively or form explosive compounds with many objects. It is slightly water soluble, and reacts with moisture to form hypochlorous acid $HClO$ and hydrochloric acid $HCl$.Chlorine is commonly pressurised and cooled for storage and shipment as an amber-coloured liquid.

Chlorine can be prepared by taking either $Mn{{O}_{2}}$and $KMn{{O}_{4}}$ and is prepared according to the following reactions :-
$2KMn{{O}_{4}}+3{{H}_{2}}S{{O}_{4}}+10HCl\to {{K}_{2}}S{{O}_{4}}+2MnS{{O}_{4}}+8{{H}_{2}}O+5C{{l}_{2}}$$Mn{{O}_{2}}+4HCl\to MnC{{l}_{2}}+2{{H}_{2}}O+C{{l}_{2}}$
Thus, Option (D) is correct.

Note: Chlorine has many uses. It is used to purify water and is used for sanitation purposes. Along with that, it is used as a bleaching agent in the manufacturing of paper and cloth. It is used in the preparation of chlorides, pesticides, synthetic rubbers and refrigerants.