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Question

An electric current is passed through an aqueous solution of lithium bromide.
What are produced at the cathode and anode respectively?


A
At cathode : H2(g)
At anode : O2(g)
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B
At cathode : Li(s)
At anode :
Br2(l)
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C
At cathode : Br2(l)
At anode : Li(s)
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D
At cathode : O2(g)
At anode : H2(g)
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Solution

The correct option is A At cathode : H2(g)
At anode : O2(g)

Ions present in given soltion are H+, OH, Li+and Br and their standard reduction potential are
Ions Half Reduction reaction E(ev)
H+ H+(aq.)+e12H2(g) 0
OH 2H2O(l) +O2(g) +4e4OH(aq.) 0.40
Li+ Li+(aq.) +eLi (s) -3.04
Br Br2 + e12Br(aq.) 1.09

The cation that has a more postive reduction potential ( E) gets reduced.
The anion that has a more negative reduction potential ( E) gets oxidised.
In an aqueous solution, the reaction at anode and cathode can be represented as:
At the anode H2O2H+ +12O2(g) +e oxygen gas is produced

At cathode H2O+e12H2(g)+OH hydrogen gas is produced

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