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.

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.

Prashant Kotian · Accepted Answer

Correct answer: B. The green flame indicates the presence of Ba2+. The formation of a brown-red gas (CrO2Cl2) with K2Cr2O7 and conc. H2SO4 confirms the presence of Cl-. Hence, (A) is BaCl2.

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