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Question

...BrO3(aq)+...Br(aq)+...H+(aq)...Br2(l)+...H2O
After balancing the above equation. What is the ratio of coefficient BrO3 to Br ?

A
1 : 5
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B
1 : 3
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C
1 : 2
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D
1 : 1
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E
2 : 3
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Solution

The correct option is A 1 : 5
The unbalanced chemical equation is
BrO3(aq)+Br(aq)+H+(aq)Br2(l)+H2O
The oxidation number of bromine increases from -1 (in Br ion) to 0 (in Br2 ).
Increase in the oxidation number is 1.
The oxidation number of bromine decreases from +5 (in BrO3 ) to 0 (in Br2 ).
Decrease in the oxidation number of bromine is 5.
Balance increase in oxidation number with decrease in oxidation number.
BrO3(aq)+5Br(aq)+H+(aq)3Br2(l)+H2O
Hence, the ratio of BrO3 to Br is 1: 5.

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