Question

Explosion of crackers takes place due to application of ____ on them.
A. temperature
B. pressure
C. heat
D. none of these

Answer 1

Hint:When the cracker is ignited, the gunpowder inside the cracker reacts with the oxygen to form heat and light which results in increasing the pressure inside it.The reaction involved in the explosion of the cracker is combustion reaction.

Complete step by step answer:During the explosion of the cracker the explosive reactant changes its state from solid form to gaseous form along with the formation of bright light, heat and explosive sound. As the composition of the reactant and the state changes along with its physical properties and chemical properties, the explosion of crackers are considered as a chemical change.
In the explosion of crackers the main reaction involved is the combustion reaction. The combustion reaction is defined as the reaction where the compound reacts with the oxygen which results in the formation of light and heat.
The ignition of crackers results in a big explosion with the release of heat and light by the sudden reaction with the atmospheric oxygen which results in the increase of pressure inside the cracker and due to this explosion takes place. Due to the explosion, the gases are formed which are hot and can expand. This property of gases is due to Charles law which states that when the temperature of the gas present inside increases the volume also increases if the pressure remains constant.
Thus, Explosion of crackers takes place due to application of pressure on them.
Therefore, the correct option is B.

Note: In combustion reaction it is necessary that one of the reactants should be oxygen. The explosive sound of the cracker is due to the expansion of gases whose rate is faster than the speed of sound.