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Question: Answered & Verified by Expert
Assertion : Dinegative anion of oxygen $\left(\mathrm{O}^{2-}\right)$ is quite common but dinegative anion of sulphur $\left(\mathrm{S}^{2-}\right)$ is less common.
Reason : Covalency of oxygen is two.
ChemistryClassification of Elements and Periodicity in PropertiesAIIMSAIIMS 2002
Options:
  • A If both the assertion and reason are true and reason is a correct explanation of the assertion.
  • B If both assertion and reason are true but assertion is not a correct explanation of the assertion.
  • C If the assertion is true but the reason is false.
  • D If both assertion and reason are false.
Solution:
2486 Upvotes Verified Answer
The correct answer is: If both assertion and reason are true but assertion is not a correct explanation of the assertion.
Oxygen is second most electronegative element after fluorine. So it can easily gain electrons to form dinegative anion $\left(\mathrm{O}^{2-}\right)$ while sulphur is not so electronegative element as oxygen.

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