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Find number of pairs in which difference between total number of electrons is zero.N2O,CO2NO2+,CO2NH3,PH4+Cr6+,Sc3+Se2−,Br−NO2+,O3 (i) (ii) (iii) (iv) (v) (vi)

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answer is 4.

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Isoelectronic species are (i). (ii), (iv) and (v)

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Find number of pairs in which difference between total number of electrons is zero.N2O,CO2NO2+,CO2NH3,PH4+Cr6+,Sc3+Se2−,Br−NO2+,O3 (i) (ii) (iii) (iv) (v) (vi)