Which of the following are isoelectronic species, Chemistry

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Which of the following are isoelectronic species

                 I= CH+3, II-NH2, III- NH+4, IV-NH3

(1) I, II, III             

(2) II, III, IV 

(3) I, II, IV     

(4) I and II

Ans:  II, III, IV

 


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