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Among the following groupings which represents the collection of isoelectronic species?

a) \[NO^{+},C_2^{2-},O_2^-,CO\]
b) \[N_{2},C_2^{2-},CO,NO\]
c) \[CO,NO^{+},CN^{-},C_2^{2-}\]
d) \[NO,CN^{-},N_{2},O_2^-\]

Answer: c
Explanation: The species \[CO,NO^{+},CN^{-},C_2^{2-}\]   Contain 14 electrons each.

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