MCQ
Which of the following is paramagnetic?
- A$[Fe(CN)_6]^{4-}$
- B$[Ni(CO)_4]$
- C$[Ni(CO)_4]^{2-}$
- ✓$[CoF_6]^{3-}$

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Given :
Molar mass $N =14\,g\,mol ^{-1} ; O =16\,g\,mol ^{-1} ; C =12\,g\,mol ^{-1} ; H =1\,g\,mol ^{-1}$;
Choose the correct answer from the options given below:
$X$ and $Y$ are