TS EAMCET · Chemistry · Classification of Elements and Periodicity in Properties

Assertion (A) : The ionic radii of \(\mathrm{Na}^{+}\)and \(\mathrm{F}^{-}\)are same Reason (R): Both \(\mathrm{Na}^{+}\)and \(\mathrm{F}^{-}\)are isoelectronic species The correct answer is

A (A) and (R) are correct. (R) is the correct explanation of (A)
B (A) and (R) are correct, but (R) is not the correct explanation of \((\mathrm{A})\)
C (A) is correct but (R) is not correct
D (A) is not correct but ( R ) is correct

Verified Solution

Answer & Solution

Correct Answer

(D) (A) is not correct but ( R ) is correct

Step-by-step Solution

Detailed explanation

Ionic radii of \(\mathrm{F}^{-}\)is greater than \(\mathrm{Na}^{+} \mathrm{Na}^{+}\)and \(\mathrm{F}^{-}\)both have ten electrons so they are isoelectronic species.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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