Question

Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.
(i) $C{u}^{+}$ undergoes disproportionation to $Cu$ and $C{u}^{2+}$ in aqueous solution.
(ii) $H{g}_{2}C{l}_2$ does not impart chromyl chloride test.
(iii) Sulphide ions react with sodium nitroprusside to form a purple coloured complex. In this reaction, oxidation state of iron changes.

• A. TFF
• B. FTT
• C. TFT
• D. TTT

Answer 1

The correct option is D TTT

Sulphide ions react with sodium nitroprusside to form a purple coloured complex.

Reaction:

$N{a}_{2}S+N{a}_2\left[Fe\right(CN{)}_5]NO\to N{a}_4[Fe\left(CN{)}_5\right]NOS$(purple colour)

Chromyl chloride test is given by ionic chlorides only. Chloride of $H{g}^{+}$does not respond to chromyl chloride test due to covalent character, which allows to ionise only slightly.

In an aqueous medium, $C{u}^{2+}$ is more stable than $C{u}^{+}$. This is because although energy is required to remove one electron from $C{u}^{+}$ to $C{u}^{2+}$, high hydration energy of $C{u}^{2+}$ compensates for it.

Therefore, $C{u}^{+}$ ion in an aqueous solution is unstable. It disproportionates to give $C{u}^{2+}$ and $Cu$.

$2C{u}^{+}\to Cu+C{u}^{+2}$

So all statements are correct.

Option D is correct.