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Question

The redox reaction among the following is:

A
formation of ozone from atmospheric oxygen in the presence of sunlight
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B
reaction of [Co(H2O)6]Cl3 with AgNO3
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C
reaction of H2SO4 with NaOH
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D
combination of dinitrogen with dioxygen at 2000 K
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Solution

The correct option is D combination of dinitrogen with dioxygen at 2000 K
Combination of dinitrogen with dioxygen at 2000K

N2(g)+O2(g)2NO(g)

Oxidation state of N in N2=0
Oxidation state of N in NO=+2

Oxidation state of O in O2=0
Oxidation state of O in NO=2

Here, the oxidation state of N is changing from zero or native state to +2 state and for oxygen it is changing from 0 to 2 state. Therefore N is getting oxidised and O is getting reduced. Hence, combination of dinitrogen with dioxygen is a redox reaction.


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