Analytical ChemistryHard
Question
A colourless solution of a compound gives a precipitate with AgNO3 solution but no precipitate with a solution of Na2CO3. The action of concentrated H2SO4 on the compound liberates a suffocating reddish brown gas. The compound is :
Options
A.Ba(CH3COO)2
B.CaCl2
C.NaI
D.NaBr
Solution
Ag+ + Br- → AgBr ↓ (pale yellow) ; NaBr + Na2CO3 → No reaction.
2NaBr + 2H2SO4 → Br2 (reddish brown) + SO2 + SO42- + 2Na+ + 2H2O.
2NaBr + 2H2SO4 → Br2 (reddish brown) + SO2 + SO42- + 2Na+ + 2H2O.
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