Question

The 'pop' sound occurred due to formation of which gas:
a.) Oxygen
b.) Hydrogen
c.) Nitrogen
d.) Carbon dioxide

Answer 1

Hint: Pop sound signifies the presence of any combustible gas , which would immediately catch fire as soon as it is brought in contact with sufficient heat or fire. So using this concept we will find the required gas amongst the four given options and also where this pop sound is heard.

Complete step by step answer:
Hydrogen burns with "pop" sound because it is highly reactive in nature or highly flammable ,whereas Carbon dioxide , Nitrogen ,Oxygen are not flammable. Although we need oxygen for the combustion process. The reaction of hydrogen with oxygen is very fast. We know that heat causes gases to expand , so whenever we bring hydrogen in contact with heat it expands , it is so fast that it breaks the sound barrier and as a result we hear a ‘pop’ sound.
Hence, the 'pop' sound occurred due to formation of Hydrogen.
So, the correct answer is “Option B”.

Note: We can do a small safe test by taking some amount of hydrogen gas in the test tube , bring the mouth of the test tube near a burning splint , confirmation can be made If we hear a pop sound . Hydrogen gas is also used in breaking down crude oil , gasoline and other petroleum products as well. They are used as hydrogenating agents for polyunsaturated fats also called Vanaspati ghee. Also hydrogen can be used as hydrodealkylation and hydrocracking.