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1
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which among the following is diamagnetic?

A
$$\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$$
B
$$\left[\mathrm{Co}\left(\mathrm{F}_6\right)\right]^{3-}$$
C
$$\left[\mathrm{NiCl}_4\right]^{2-}$$
D
$$\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$$
2
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The complex $$\left[\mathrm{PtCl}_2(\mathrm{en})_2\right]^{2+}$$ ion shows

A
structural isomerism
B
geometrical isomerism only
C
optical isomerism only
D
geometrical and optical isomerism
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The blue colouration obtained from the Lassaigne's test of nitrogen is due to the formation of

A
$$\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3$$
B
$$\mathrm{Fe}_2\left[\mathrm{Fe}(\mathrm{CN})_6\right]_5$$
C
$$\mathrm{K}_2\left[\mathrm{Fe}(\mathrm{CN})_6\right]_5$$
D
$$\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3$$
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Aqueous $$\mathrm{CuSO}_4$$ changes its colour from sky blue to deep blue on addition of $$\mathrm{NH}_3$$ because

A
$$\mathrm{Cu}^{2+}$$ forms hydrate
B
$$\mathrm{Cu}^{2+}$$ changes to $$\mathrm{Cu}^{+}$$
C
$$\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+}$$ is labile complex and changes to $$\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+}$$ as $$\mathrm{NH}_3$$ is stronger ligand than $$\mathrm{H}_2 \mathrm{O}$$
D
$$\mathrm{Cu}^{+}$$ changes to $$\mathrm{Cu}^{2+}$$
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