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 Cu2+ in aqueous solution (ii) Hg2Cl2

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) Cu+ undergoes disproportionation to Cu and Cu2+ in aqueous solution (ii) Hg2Cl2 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.

Prashant Kotian · Accepted Answer

Correct answer: D. Step 1: In Group III qualitative analysis, the group reagent consists of NH4OH in the presence of NH4Cl. Step 2: Ammonium chloride (NH4Cl) suppresses the dissociation of the weak base NH4OH via the common ion effect of NH4+, reducing the concentration of OH- ions so that only the less soluble Group III hydroxides precipitate, while the more soluble Group IV hydroxides (Ni2+, Co2+, Zn2+, Mn2+) remain in solution. Step 3: Therefore, treating the solution with excess NH4Cl prevents the unwanted co-precipitation of Group IV cations, matching option (b).

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