Compound (T) imparts violet colour to flame. (T) + compound (U) + conc. H2SO4 -> (V) Red gas. (V) pa — Qualitative and Quantitative Analysis Chemistry Question
Question
Compound (T) imparts violet colour to flame. (T) + compound (U) + conc. H2SO4 -> (V) Red gas. (V) passed through NaOH then + AgNO3 -> (W) Red ppt. (W) + NH3 soln. -> (X). (X) + dil. HCl -> (Y) white ppt. Compound (U) + NaOH -Δ-> (Z) gas (gives white fumes with HCl). Identify (T) to (Z):
Answer: B
💡 Solution & Explanation
T is K2Cr2O7 (K+ gives violet flame). U is NH4Cl. They react with conc. H2SO4 to give CrO2Cl2 (V, red gas). CrO2Cl2 + NaOH -> Na2CrO4, which with AgNO3 gives Ag2CrO4 (W, red ppt). Ag2CrO4 dissolves in NH3 to form [Ag(NH3)2]+ (X), which with HCl gives AgCl (Y, white ppt). NH4Cl + NaOH -> NH3 (Z, gas giving white fumes with HCl).
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