Analytical ChemistryHard
Question
Which of the following statement(s) is/are correct with respect to bromide ions ?
Options
A.KBr on heating with MnO2 and concentrated H2SO4 liberates Br2 and SO2 gases.
B.KBr on heating with concentrated H2SO4 liberates Br2 and SO2 gases.
C.KBr forms HBr with concentrated H3PO4.
D.KBr(s) liberates Br2 on gentle warming with concentrated H2SO4 and K2Cr2O7(s).
Solution
(A) 2KBr + MnO2 + 2H2SO4 → Br2 ↑ + 2K+ + Mn2+ + 2SO42- + 2H2O
(B) 2KBr + 2H2SO4 → Br2 ↑ + SO2 ↑ + SO42- + 2K+ + 2H2O
(C) KBr + H3PO4 → HBr + H2PO4- + K+
(D) 6KBr + K2Cr2O7 + 7H2SO4 → 3Br2 + 2Cr3+ + 2K+ + 7SO42- + 7H2O
(B) 2KBr + 2H2SO4 → Br2 ↑ + SO2 ↑ + SO42- + 2K+ + 2H2O
(C) KBr + H3PO4 → HBr + H2PO4- + K+
(D) 6KBr + K2Cr2O7 + 7H2SO4 → 3Br2 + 2Cr3+ + 2K+ + 7SO42- + 7H2O
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