Chemistry · Periodic trends in properties of elements: atomic and ionic radii, ionization enthalpy, electron gain enthalpy, valence, oxidation states and chemical reactivity
Assertion Sodium metal is stored under Kerosene. Reason Metallic sodium melts wh
Assertion Sodium metal is stored under Kerosene. Reason Metallic sodium melts when exposed to air.
- A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- C. Assertion is correct but Reason is incorrect
- D. Assertion is incorrect but Reason is correct
Step-by-step solution
Sodium metal is highly reactive with moisture and oxygen in air, so it is stored under kerosene to prevent reaction. The reason states that metallic sodium melts when exposed to air, which is incorrect; sodium reacts vigorously with air but does not melt at room temperature (melting point ~97.8°C). Thus, assertion correct, reason incorrect.