IAT (IISER) 2024 | Coordination Compounds Question 1 | Chemistry

Which of the following complexes exhibit(s) magnetic moment close to 2 BM ? $$ \left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]\left(\mathrm{NO}_3\right)_2, \mathrm{~K}_2\left[\mathrm{MnCl}_4\right], \mathrm{K}_4\left[\mathrm{Mn}(\mathrm{CN})_6\right] \text {, and }\left[\mathrm{Ni}(\mathrm{CO})_4\right] $$

$\mathrm{K}_4\left[\mathrm{Mn}(\mathrm{CN})_6\right]$ and $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$

$K_2\left[\mathrm{MnCl}_4\right]$ and $K_4\left[\mathrm{Mn}(\mathrm{CN})_6\right]$

$\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]\left(\mathrm{NO}_3\right)_2$ and $\mathrm{K}_2\left[\mathrm{MnCl}_4\right]$

Only $K_4\left[\mathrm{Mn}(\mathrm{CN})_6\right]$

IAT (IISER) 2024

MCQ (Single Correct Answer)

-1

The following complex ions absorb in the ultraviolet-visible region of light. Which one of these shows violet colour?

$$ \left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+},\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)\left(\mathrm{NH}_3\right)_5\right]^{3+},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}, \text { and }\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-} $$

$\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)\left(\mathrm{NH}_3\right)_5\right]^{3+}$

$\left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+}$

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$

$\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}$

IAT (IISER) 2022

MCQ (Single Correct Answer)

-1

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

$\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]$ and KOH

$\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]$ and $\mathrm{H}_2 \mathrm{O}$

$\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right], \mathrm{H}_2 \mathrm{O}$ and $\mathrm{H}_2 \mathrm{O}$

$\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_5(\mathrm{OH})\right]$ and HCN

IAT (IISER) 2022

MCQ (Single Correct Answer)

-1

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

$\left(t_{2 g}\right)^3\left(e_g\right)^0$

$\left(t_{2 g}\right)^6\left(e_g\right)^4$

$\left(t_{2 g}\right)^6\left(e_g\right)^2$

$\left(t_{2 g}\right)^4\left(e_g\right)^2$

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