Question

ASSERSION: When $HCl$ in a jar is poured into a jar containing a burning candle, the candle is put out.
REASON: $HCl$ is a fire extinguisher.
A) Both assertion and reason are correct and reason is the correct explanation of assertion.
B) If both assertion and reason are correct but reason is not the correct explanation of the assertion.
C) If the assertion is correct but the reason is incorrect.
D) If the assertion is incorrect but the reason is correct.

Answer 1

Hint: $HCl$ produce $C{{O}_{2}}$ when pour into jar and $C{{O}_{2}}$ is against combustion that’s why the candle in jar is put out. And we know that carbon dioxide works to extinguish the fire due to its heavy molecular mass and cooling capacity.

Complete step by step solution:
When $HCl$ is poured into the jar slowly, then there will be generation of $C{{O}_{2}}$ in the jar that is against combustion. $C{{O}_{2}}$ is non-combustible gas and it is too heavier than oxygen${{O}_{2}}$ then it covers the candle from all the direction and restrict the contact of fuel and oxygen ${{O}_{2}}$. Then it extinguishes the fire in the jar. So, $HCl$is a fire extinguisher.
Our assertion is correct and reason is correct explanation of assertion

Hence option (A) is correct.

Additional Information:
Fire extinguishers contain different chemicals, depending on the application. Handheld extinguishers, which are commonly sold at hardware stores for use in the kitchen or garage, are pressurized with nitrogen or carbon dioxide \[(C{{O}_{2}})~\]to propel a stream of fire-squelching agent to the fire. The active material may be a powder such as potassium bicarbonate\[~(KHC{{O}_{3}})\], liquid water, an evaporating fluorocarbon or the propelling agent itself.
 In cylinders, \[C{{O}_{2}}\] ​ is kept in the liquid form. When released, it expands enormously and cools down. This brings down the temperature of the fuel, which helps in controlling the fire.

Note: Learn \[C{{O}_{2}}\] is a non-combustible gas and used to extinguish fire. Carbon dioxide is not a poisonous gas while carbon monoxide is a poisonous gas that’s why we use carbon dioxide as an extinguisher while in recent studies it is also harmful for our environment.