JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties
Which of the following arrangements represents the increasing order ( smallest to largest) of ionic radii of the given species \(O^{2-}, S^{2-}, N^{3-}, P^{3-}\) ?
- A \({O^{2 - }}\, < \,{N^{3 - }}\, < \,\,{S^{2 - }}\, < \,\,{P^{3 - }}\)
- 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 & Solution
Correct Answer
(A) \({O^{2 - }}\, < \,{N^{3 - }}\, < \,\,{S^{2 - }}\, < \,\,{P^{3 - }}\)
Step-by-step Solution
Detailed explanation
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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