A colourless inorganic compound (A) imparts a green colour to the flame. Its solution gives a white — Qualitative and Quantitative Analysis Chemistry Question

Question

A colourless inorganic compound (A) imparts a green colour to the flame. Its solution gives a white ppt. (B) with H2SO4. When heated with K2Cr2O7 and conc. H2SO4, a brown red vapour/gas (C) is formed. The gas/vapour when passed through aqueous NaOH solution, it turns into a yellow solution (D) which forms yellow precipitate (E) with CH3COOH and (CH3COO)2Pb. With reference to above information, answer the following questions.