Which of the following arrangements represents the increasing ord… - Vidyadip

MCQ

Which of the following arrangements represents the increasing order ( smallest to largest) of ionic radii of the given species $O^{2-}, S^{2-}, N^{3-}, P^{3-}$ ?

✓
${O^{2 - }}\, < \,{N^{3 - }}\, < \,\,{S^{2 - }}\, < \,\,{P^{3 - }}$
B
${O^{2 - }}\, < \,{P^{3 - }}\, < \,\,{N^{3 - }}\, < \,{S^{2 - }}$
C
${N^3}\, < \,{O^{2 - }}\, < \,\,{P^{3 - }}\, < \,{S^{2 - }}$
D
${N^{3 - }}\, < \,{S^{2 - }}\, < \,\,{O^{2 - }}\, < \,{P^{3 - }}$

✓

Answer

Correct option: A.

${O^{2 - }}\, < \,{N^{3 - }}\, < \,\,{S^{2 - }}\, < \,\,{P^{3 - }}$

a
For isoelectronic species ionic radii decreases as the charge on ion decreases. Further on moving down in a group ionic radii increases. Hence the correct order is

${O^{2 - }}\, < \,{N^{3 - }}\, < \,\,{S^{2 - }}\, < \,\,{P^{3 - }}$

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