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Question

In which of the following reaction, Boron does not act as reducing agent ?

A
B+CO2
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B
B+Mg
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C
B+SiO2
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D
B+HNO3
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Solution

The correct option is B B+Mg
Boron does not act as a reducing agent in the reaction
2B+3MgMg3B2
In this reaction, Mg is oxidized to Mg2+. Hence, B acts as an oxidising agent. B itself is reduced.
Note: B reduces SiO2 to Si and CO2 to C.
4B+3SiO23Si+2B2O3
4B+3CO23Si+2B2O3

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