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NEETChemistryClassification of Elements and Periodicity in Properties

Given below are two statements : one is labelled as Assertion and the other is labelled as Reason. Assertion: The ionic radii of O 2 - and Mg 2 + are same. Reason: Both O 2 - and Mg 2 + are isoelectronic species. In the light of the above statements, choose the correct answer from the options given below.

Options

  1. ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. BBoth Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. CAssertion is true but Reason is false.
  4. DAssertion is false but Reason is true.

Correct answer

D. Assertion is false but Reason is true.

Step-by-step solution

Both Mg 2 + and O - 2 have 10 electrons each and they are isoelectronic species. But the size of O - 2 is greater than Mg 2 + as size ∝ 1 z e z e of Mg 2 + = 12 10 = 1 . 2 z e of O - 2 = 8 10 = 0 . 8 z e = Number of protons Number of electrons

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