MCQ
Which ion is not coloured
- A$C{r^{3 + }}$
- B$C{o^{2 + }}$
- C$C{r^{2 + }}$
- ✓$C{u^ + }$
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Reason : Half-filled s orbital has greater stability.

(Take $pH_2 = 1\,atm$ ), $T = 298\,K$.