1.

The isoelectronic pair is(a) CO, N2(b) O2, NO(c) C2, HF(d) F2, HCl

Answer»

Answer is : (a) CO, N2 and (d) F2, HCl

Isoelectronic species are those species, which have same number of electrons. The total number of electrons in each pair given in the options are as follows

(a) CO, N2

No. of electrons in CO = 6+8 = 14

No. of electrons in N2 = 7+7 = 14

(b) O2, NO

No. of electrons in O2 = 8+8 = 16

No. of electrons in NO = 7+8 = 15

(c) C2, HF

No. of electrons in C2 = 6+6 = 12

No. of electrons in HF = 1+9 = 10

(d) F2, HCl

No. of electrons in F2 = 9+9 = 18

No. of electrons in HCl = 1+17 = 18

Thus, CO and N2, F2 and HCl are isoelectronic pairs.


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