NEET 2015 Chemistry question

Which of the following pairs of ions are isoelectronic and isostructural ?

(1)
(2)
(3)Correct
(4)

Answer: (3)

Solution

Count electrons: = 17 + 24 + 1 = 42; = 16 + 24 + 2 = 42; = 6 + 24 + 2 = 32; = 7 + 24 + 1 = 32. The isoelectronic pairs are (, ) with 42 electrons each and

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Question ID VK-091663