Question

12. Assertion: Oxygen has less negative electron gain enthalpy
than Sulphur
Reason: Oxygen is more electronegative than Sulphur

Answer 1

Answer:

both assertion and reason are correct statements , reason is correct for assertion

Explanation:

Answer 2

Answer:

The correct answer is Both assertion and reason is correct and reason is the correct explanation for the assertion.

Explanation:

• As the size of the atom increases, the distance between the nucleus and the large shell also increases. This is the known as shielding effect. This decrease the force of attraction between the nucleus and the incoming electron. Hence the electron gain enthalpy become less negative.

• Sulphur has very much large size than oxygen atom. Therefore the electron density will be more higher in oxygen than the sulphur. And due to, very compactly pact the edition of electrons in oxygen is very difficult.
• As the oxygen has small size the shielding effect is very less, whereas in the case of sulfur the shielding effect is high because it is large in shape than oxygen. Therefore, oxygen is more electronegative than sulphur and sulphur is more Electro positive than oxygen.
  Therefore ,  Oxygen has less negative electron gain enthalpy.
  
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