NEET · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties

Which of the following orders of ionic radii is correctly represented ?

A \(H^- > H^+ > H\)
B \(Na^+ > F^- > O^{2-}\)
C \(F^- > O^{2-} > Na^+\)
D None of the above

Verified Solution

Answer & Solution

Correct Answer

(D) None of the above

Step-by-step Solution

Detailed explanation

Cations lose electrons and are smaller in size than the parent atom, whereas anions add electrons and are larger in size than the parent atom. Hence, the order is \(\mathrm{H}^{-}>\mathrm{H}\) \(>\mathrm{H}^{+}\) For isoelectronic species, the ionic radii decreases with increase in atomic number

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.

Same subject

Match List \(I\) with List \(II\).

List \(I\) (Conversion)	List \(II\) (Number of Faraday required)
\(A\). \(1 \mathrm{~mol}\) of \(\mathrm{H}_2 \mathrm{O}\) to \(\mathrm{O}_2\)	\(l\). \(3 \mathrm{~F}\)
\(B\). \(1 \mathrm{~mol}\) of \(\mathrm{MnO}_4^{-}\)to \(\mathrm{Mn}^{2+}\)	\(II\). \(2 F\)
\(C\). \(1.5 \mathrm{~mol}\) of \(\mathrm{Ca}\) from molten \(\mathrm{CaCl}_2\)	\(III\). \(1F\)
\(D\). \(1 \mathrm{~mol}\) of \(\mathrm{FeO}\) to \(\mathrm{Fe}_2 \mathrm{O}_3\)	\(IV\). \(5 \mathrm{~F}\)

Choose the correct answer from the options given below:

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