The set having ions which are coloured and paramagnetic both is :
Solution
$$\left. \matrix{
C{u^{2 + }}:[Ar]3{d^9}4{s^0} \hfill \cr
C{r^{3 + }}:[Ar]3{d^3}4{s^0} \hfill \cr
S{c^ + }:[Ar]3{d^1}4{s^1} \hfill \cr} \right]$$All are coloured and paramagnetic due to presence of unpaired electrons
About this question
Subject: Chemistry · Chapter: d and f Block Elements · Topic: Properties of Transition Metals
This question is part of PrepWiser's free JEE Main question bank. 155 more solved questions on d and f Block Elements are available — start with the harder ones if your accuracy is >70%.