1. Do you expect permanganate ion (MnO 4 - ) to oxidize bromide ion to bromine l
ID: 974076 • Letter: 1
Question
1. Do you expect permanganate ion (MnO4-) to oxidize bromide ion to bromine liquid in acidic solution?
A. The oxidation of bromide ion by permanganate ion is a spontaneous reaction.
B. The oxidation of bromide ion by permanganate ion is not a spontaneous reaction.
A. The oxidation of bromide ion by dichromate ion is not a spontaneous reaction.
B. The oxidation of bromide ion by dichromate ion is a spontaneous reaction.
2. Will dichromate ion (Cr2O72-) oxidize bromide ion to bromine liquid in acidic solution?A. The oxidation of bromide ion by dichromate ion is not a spontaneous reaction.
B. The oxidation of bromide ion by dichromate ion is a spontaneous reaction.
12(s) 2e21 (aq) Fe3(a)eFe2(aq) Hg^2-(aq) + 2e2Hg(l) Ag (aq) Ag(s) Hg2+(aq) + 2e Hg() CIO"(aq) + H2O() + 2e C1"(aq) + 20H-(aq) 2Hg2+(aq) + 2e Hg22+(aq) NO3 (a)4H (a) 3e NOg) 2H200) Br2(1) + 2e-_-2Br-(aq) Og(g) + 4H+(aq) + 4e 2H20(1) Cr2072-(aq) + 14H+(aq) + 6e--2Cr3+(aq) + 7H20(/) Cl2(g) + 2e 2C(aq) MnO4 (a)8H (aq) + 5eMn2 (a)4H2O0) H2O2(aq) + 2H+(aq) + 2e-_-2H20(/) S20s(a) 2e2SO42(aq) F2(g) + 2e-_ 2F-(aq) 0.54 0.80 0.80 0.85 0.90 0.90 0.96 1.07 1.23 1.33 1.36 1.49 1.78 2.01 2.87Explanation / Answer
MnO4- + 8H+ + 5e- ---> Mn2+ + 4H2O , Eo = 1.49
Br2---> 2Br- , Eo = 1.07
standard reduction potentil of MnO4- in acidic medium is higher than Br2 reduction
hence MnO4- prefers reduction and is capable of oxidising Br- to Br2
Eo cell = 1.49 - (1.07) = 0.42 V
hence oxidation of bromide ion is sponatnous
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