Question

Which one of the following pairs of substances when mixed, produces chlorine gas at room temperature?
A. $NaCl\,\,and\,\,HN{{O}_{3}}(conc)$
B. $NaCl\,\,and\,\,MN{{O}_{2}}$
C. $NaCl\,\,and\,\,{{H}_{2}}S{{O}_{4}}(conc)$
D. $HCl\,(conc)\,and\,\,KMN{{O}_{4}}$

Answer 1

Hint: In this question, we are asked to describe that product which produces chlorine gas at room temperature. To answer this question, we must know about the products that these chemicals give on mixing then we choose the correct option.

Complete Step by Step Solution:
In this question, we have to find chemicals which in reaction give chlorine gas.
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-colored liquid.

$HCl\,(conc)\,and\,\,KMN{{O}_{4}}$ are the pairs that, when assorted, produce chlorine gas at room temperature. The reaction is as follows :-
$2KMn{{O}_{4}}+3{{H}_{2}}S{{O}_{4}}+10HCl\to {{K}_{2}}S{{O}_{4}}+2MnS{{O}_{4}}+8{{H}_{2}}O+5C{{l}_{2}}$

In the above reaction, redox reaction takes place because both oxidation and reduction reaction take place at the same time. Chlorine has an oxidation state of -1 and when reaction takes place, its oxidation state changes from -1 to 0 and it gets oxidised.

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.