When a burning splinter is brought near the gas jar containing hydrogen gas a popping sound is observed. It is due to
exothermic
endothermic
exothermic and endothermic
none of these
When a burning splinter is brought near the gas jar containing hydrogen gas a popping sound is observed. It is due to
exothermic
endothermic
exothermic and endothermic
none of these
The correct option is A exothermic
Combustion of Hydrogen
Hydrogen (H2) is a highly combustible gas and therefore, burns in air. The burning of Hydrogen is an explosive reaction. When a burning splinter is brought near a test tube containing Hydrogen gas, it starts to burn.
The chemical equation for the combustion is:
(Hydrogen) (Oxygen) (Water vapour)
This reaction is explosive as a lot of energy is released during the reaction. The heat in the reaction causes the gaseous mixture to expand. The quick expansion of gas produces a pop sound. If the amount of Hydrogen is not controlled in the reaction, it will cause a huge explosion.
Reactions in which energy is released from the system are called exothermic reactions. Since burning of Hydrogen produces a large amount of heat, it is an exothermic reaction. Option (A) is correct.
Reactions in which energy is absorbed by system are called endothermic reactions. Since energy is not absorbed by Hydrogen during burning, it is not an endothermic reaction. Option (B) and (C) are incorrect.
Therefore, the correct option is (A) exothermic.
exothermic
Combustion of Hydrogen
Hydrogen (H2) is a highly combustible gas and therefore, burns in air. The burning of Hydrogen is an explosive reaction. When a burning splinter is brought near a test tube containing Hydrogen gas, it starts to burn.
The chemical equation for the combustion is:
(Hydrogen) (Oxygen) (Water vapour)
This reaction is explosive as a lot of energy is released during the reaction. The heat in the reaction causes the gaseous mixture to expand. The quick expansion of gas produces a pop sound. If the amount of Hydrogen is not controlled in the reaction, it will cause a huge explosion.
Reactions in which energy is released from the system are called exothermic reactions. Since burning of Hydrogen produces a large amount of heat, it is an exothermic reaction. Option (A) is correct.
Reactions in which energy is absorbed by system are called endothermic reactions. Since energy is not absorbed by Hydrogen during burning, it is not an endothermic reaction. Option (B) and (C) are incorrect.
Therefore, the correct option is (A) exothermic.
