JEE MAIN - Chemistry (2021 - 22th July Evening Shift - No. 10)
The set having ions which are coloured and paramagnetic both is :
Cu2+, Cr3+, Sc+
Cu2+, Zn2+, Mn4+
Sc3+, V5+, Ti4+
Ni2+, Mn7+, Hg2+
Explanation
$$\left. \matrix{
C{u^{2 + }}:[Ar]3{d^9}4{s^0} \hfill \cr
C{r^{3 + }}:[Ar]3{d^3}4{s^0} \hfill \cr
S{c^ + }:[Ar]3{d^1}4{s^1} \hfill \cr} \right]$$All are coloured and paramagnetic due to presence of unpaired electrons
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