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Question

In a reaction 4 moles of electrons are transferred to one mole of HNO3 when acted as an oxidant. The possible reduction product is?

A
(1/2) mole of N2
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B
(1/2) mole of N2O
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C
1 mole of NO2
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D
1 mole of NH3
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Solution

The correct option is A (1/2) mole of N2O
(1/2) mole of N2O
Oxidation state of nitrogen in HNO3
Let the oxidation state of nitrogen in HNO3 be x.
1+x+(3×2)=0
x5=0
x=5
Hence, Oxidation state of nitrogen in HNO3=+5
As given that 4 moles of electrons are transferred to one mole of HNO3 i.e., the oxidation no. of nitrogen in reduction product becomes +1.
Hence, the possible reduction product is (1/2) mole of N2O as the oxidation no. of nitrogen is +1 in N2O.

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