Which of the following reagents will not be useful in separating a mixture of Zn2+ and Cu2+? — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Heating a chloride salt like NaCl with conc. H2SO4 and K2Cr2O7 produces orange-red chromyl chloride (CrO2Cl2) vapours (B). Step 2: Passing CrO2Cl2 vapours into NaOH solution forms a yellow solution of sodium chromate (Na2CrO4) (C). Step 3: Therefore, the yellow solution (C) is Na2CrO4, which corresponds to option (a).