Find the number of chemical species which are iso-electronic .
`CN^(-), NO^(+), N_2, C_2^(2-), O_2^(2+)`

Find the number of ions/molecules which are isoelectronic with O_(3)^(2+) . N_(2)^(2-),F_(2)^(2+),NO^(+),overset(Theta)"C"N,CO

Which of the following pair of species are iso-electronic ?

Consider the following species and find the total number of species which have fractional bond order : O_(2)^(+) , CO,B_(2) , O_(2)^(-) , NO^(+) , He_(2)^(+) , C_(2)^(2+) , CN^(-) , N_(2)^(-)

Find the number of species which have net zero dipole moment PCl_(5),SF_(4),H_(2)O,SnCl_(2),Cl_(2)

In O_2 (O-O) the number of electrons which are paired is

Identify the chemical species having identical bond order: O_(2)^(2+), N_(2), O_(2), O_(2)^(2-) .

If Hund rule violate, then find the total number of species among following which whill be dimagnetic: B_(2), O_(2), N_(2)^(-), C_(2), NO, OF, N_(2)^(2-), BN

Number of Chemical species having bond between nitrogen atoms N_(2)O_(4), N_(2)O_(5), N_(2)H_(4), N_(2)O, N_(2)O_(3), NH_(4)NO_(3), H_2N_2

Find number of species which produce elemental sulphur when treated with H_(2)S, Fe^(3+),Fe^(2+), SO_(2), H_(2)O, O_(3), HNO_(3)