Question

The reaction between ${{\text{H}}_{\text{2}}}$ and ${\text{C}}{{\text{l}}_{\text{2}}}$ in the direct sunlight is explosive.
True
False

Answer 1

Hint When hydrogen gas reacts with chlorine gas it produces hydrogen chloride. This reaction is exothermic in nature as heat is released in this reaction. It is not carried out in presence of direct sunlight.

Complete Step-by-Step Solution:
When a chlorine atom combines with the hydrogen atom to produce hydrogen chloride in presence of sunlight, a high amount of heat energy is released. This reaction is given as-
\[{{\text{H}}_{\text{2}}}{\text{ + C}}{{\text{l}}_{\text{2}}}\xrightarrow{{{\text{uv light}}}}{\text{2HCl}}\]
Since this reaction is exothermic in nature, it is not carried out in direct sunlight. In direct sunlight, the formed product hydrogen chloride gets protonated which results in an explosion.
This reaction is a free radical substitution reaction in which the chlorine radical reacts with hydrogen radical to form hydrogen chloride. So to prevent the explosion, the container in which the reaction occurs is placed only for a short time in presence of sunlight then after some time the container is removed from sunlight and placed in a dark room. Since the chlorine radical was already formed so the reaction continues even in the absence of sunlight.
The properties of hydrogen chloride are as follows-
a)It is a colourless gas with a pungent odour.
b)It is heavier than air.
c)In the form of liquid, it is known as hydrochloric acid.
d)Hydrochloric acid is a strong acid which completely dissociates in water.
e)It is corrosive in nature.

Answer- Hence the correct answer is A.

Note: The uses of Hydrogen chloride are given as follows-
a)It is used as a solvent in the synthesis of organic compounds.
b)It is used in the manufacture of chlorine, fertilizers and dyes.
c)It is used to clean metal products.
d)It is used as a reagent in the laboratory.
e)It is used in electroplating.
f)It is also used in the textile and rubber industry.