Question

Out of the following gases, choose the one which suits perfect according to the questions asked below:
 [Methane, Hydrogen, Nitrogen, Ammonia, Nitrogen dioxide, Chlorine]
A. Gas which burns in air or oxygen forming water.
B. A hydrocarbon which contributes towards the greenhouse effect.
C. A greenish yellow gas that turns moist starch iodide paper blue black.
D. A reddish brown gas liberated on heating lead nitrate crystals.
E. A basic gas which turns red litmus solution blue.

Answer 1

Hint: Different applications of common gases are asked in this question. For example, in (E), a bgas that would turn red litmus blue but be basic in nature, so it should have a lone pair of electrons available for donation.

Complete step by step answer:
- Chemistry is a vast subject and let us study the applications of chemistry in everyday life. Chemical principles are involved in everything from weather patterns to brain functioning to the operation of a computer. Different chemical composition of atmospheres make different weather at different places on the earth as well as on different planets too. For example, higher concentration of oxides of sulphur and nitrogen in the atmosphere causes acid rain, similarly greenhouse gases lead to extreme weather events such as drought, flooding, high wind and storm. Here principles of geo-chemistry are involved.
- Now let us come to our question.
A. Gas which burns in air or oxygen forming water is hydrogen as ${{H}_{2}}(g)+{{O}_{2}}(g)\to 2{{H}_{2}}O(l)$.
B. A hydrocarbon which contributes towards the greenhouse effect is methane $C{{H}_{4}}$
C. A greenish yellow gas that turns moist starch iodide paper blue black is chlorine $C{{l}_{2}}$
D. A reddish brown gas liberated on heating lead nitrate crystals is nitrogen dioxide gas $N{{O}_{2}}$
E. A basic gas which turns red litmus solution blue is ammonia gas $N{{H}_{3}}$, as it is basic gas.

Note: It is to be noted that nitrogen dioxide is reddish brown in colour and it forms the main constituent during fog in winters. This reddish brown smog is called photochemical smog. Moreover, ammonia gas is basic because the nitrogen in ammonia has a lone pair of electrons that are available for donation.