Single Choice

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) $$Cu^+$$ undergoes disproportionation to $$Cu$$ and $$Cu^{2+}$$ in aqueous solution. (ii) $$Hg_2Cl_2$$ 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.

ATFF
BFTT
CTFT
DTTT
Correct Answer

Solution

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

Reaction:
$$Na_2S + Na_2[Fe(CN)_5]NO\rightarrow Na_4[Fe(CN)_5]NOS$$(purple colour)

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

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

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

$$2Cu^+ \rightarrow Cu+ Cu^{+2}$$

So all statements are correct.

Option D is correct.

SIMILAR QUESTIONS

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A bromide ion does not interfere with the chromyl chloride test, because when a bromide is present :

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Which of the following reactions takes place in (ii)?

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