Coordination Compounds · Chemistry · IAT (IISER)
MCQ (Single Correct Answer)
1
Which of the following complexes exhibit(s) magnetic moment close to 2 BM ?
$$
\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]\left(\mathrm{NO}_3\right)_2, \mathrm{~K}_2\left[\mathrm{MnCl}_4\right], \mathrm{K}_4\left[\mathrm{Mn}(\mathrm{CN})_6\right] \text {, and }\left[\mathrm{Ni}(\mathrm{CO})_4\right]
$$
IAT (IISER) 2024
2
The following complex ions absorb in the ultraviolet-visible region of light. Which one of these shows violet colour?
$$ \left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+},\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)\left(\mathrm{NH}_3\right)_5\right]^{3+},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}, \text { and }\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-} $$
IAT (IISER) 2024
3
The products of the reaction between aqueous solutions of $K_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$ and $\frac{1}{2} \mathrm{H}_2 \mathrm{O}_2$ are
IAT (IISER) 2022
4
For the colourless complex $\left[M\left(H_2 O\right)_6\right]^{n+}$, where $M$ is a $3 d$ transition metal, the CORRECT ground state $d$-electron configuration of $M$ is
IAT (IISER) 2022
5
Which one of the following aqueous solutions gives the most intense colour?
IAT (IISER) 2020
6
$$ \text { The number of unpaired electron(s) in the square planar complex }[\text{Ni}(\text{CN})_4]^{2-} \text { is/are } $$ :
IAT (IISER) 2020