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Q. Which of the following is isoelectronic with $ CO_2 $ ?

UPSEEUPSEE 2006

Solution:

Isoelectronic species are those species which have equal number of electrons. Hence, $CO_2$ is isoelectronic with $N_2O$.
Number of electron in $CO_2= 22 $
Number of electron in $N_2O = 22 $