A salt (T) gives a violet colour to a flame. A compound (U) with concentrated H2SO4 yields a red gas/vapour (V); treatment with NaOH then AgNO3 gives a red precipitate (W), which on adding NH3 solution dissolves to (X); (W) with dilute HCl gives a white precipitate (Y); (U) on heating with

Question

A salt (T) gives a violet colour to a flame. A compound (U) with concentrated H2SO4 yields a red gas/vapour (V); treatment with NaOH then AgNO3 gives a red precipitate (W), which on adding NH3 solution dissolves to (X); (W) with dilute HCl gives a white precipitate (Y); (U) on heating with NaOH releases a gas (Z) that gives white fumes with HCl, and (U) sublimes on heating. Identify (T) to (Z).

Accepted Answer

T = K2Cr2O7, U = NH4Cl, V = CrO2Cl2, W = Ag2CrO4, X = [Ag(NH3)2]+, Y = AgCl, Z = NH3. K2Cr2O7 gives the chromyl chloride (CrO2Cl2) test; the chromate eventually gives red Ag2CrO4, while NH4Cl sublimes and liberates NH3 with NaOH.

Solution

Related JEE Main Chemistry questions