Question

Which of the neutral gas burns with a pop sound near a burning splint?
(A)- \[C{{O}_{2}}\]
(B)- \[{{H}_{2}}\]
(C)- \[{{O}_{2}}\]
(D)- All of the above

Answer 1

Hint: The gas which burns with a pop sound is a colourless and odourless gas. This gas is made by the lightest and most abundant element and is a major component of carbon cycle. This gas in its solid state is known as dry ice.

Complete answer:
-When we say, we burn a gas on a burning splint, what it actually means is that gas is actually undergoing a chemical reaction where it combines with oxygen to form a product.
-If we take our first option A, \[C{{O}_{2}}\] is formed when any carbon form such as coal is burned in supply of oxygen.
\[C\left( s \right)\text{ }+\text{ }{{O}_{2}}\left( g \right)\text{ }\to \text{ }C{{O}_{2}}\left( g \right)\]
But neither coal nor \[C{{O}_{2}}\] gives pop sound near a burning splint.
-If we take our option C that is \[{{O}_{2}}\], but we know that it is necessary for each and every combustion process. And it doesn’t give any pop sound because it is present in air and helping that splint to burn.
-So then we come to our option B, that is \[{{H}_{2}}\]. When we burn hydrogen, a lot of energy is released by hydrogen when it combusts, and most of this energy is released in the form of heat. Heat causes gases to expand, and since a lot of heat is released the gaseous mixture (hydrogen, oxygen remaining from and water vapour liberated from the reaction) and the air adjacent to it expand very quickly, so quickly that the gas molecules break the sound barrier.
That is the “pop” sound that we hear.

So, from the above discussion we came to know that our correct option is B.

Note:
When we burn one kilogram of fuel like hydrogen, gasoline and diesel hydrogen gives 120 megajoules of energy per kilogram of fuel. Whereas, fuel like gasoline and diesel are only able to give half of it that is 60 megajoules of energy.