Assertion (A): Sodium metal is stored under kerosene.
Reason (R): Metallic sodium melts when exposed to air.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Answer
Sodium is a very reactive metal. It is kept in kerosene to prevent it from coming in contact with oxygen and moisture.
If this happens, it will react with the moisture present in air and form sodium hydroxide. This is a strong exothermic reaction , and a lot of heat is generated.
Also, Metallic sodium does not melt when exposed to air.
Thus,
- Assertion is true
- Reasoning is false , as metallic sodium does not melt when exposed to air
So, the correct answer is (c)
