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Question

Determine the oxidation number of underlined atoms in following.

3I2+6NaOHNaIO3+5NaI+3H2O

A
0, +5, -1
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B
0, +4, -2
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C
0, +3, -1
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D
None of these
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Solution

The correct option is C 0, +5, -1
The oxidation number of underlined atoms 3I2+6NaOHNaIO3+5NaI+3H2O are 0,+5,1 respectively. Let X be the oxidation number of iodine in 3I2.
2X=0
X=0
Let X be the oxidation number of iodine in NaIO3.
1+X+3(2)=0
X=+5
Let X be the oxidation number of iodine in NaI.
1+X=0
X=1

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