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Q.

Which of the following reactions involve oxidation and reduction? 

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a

NaBr+HCl⟶NaCl+HBr

b

HBr+AgNO3⟶AgBr+HNO3

c

H2+Br2⟶2HBr

d

Na2O+H2SO4⟶Na2SO4+H2O

answer is C.

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Detailed Solution

Since the given reaction is a redox reaction it involves both oxidation and reduction.

H2+Br2⟶2HBr 

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In hydrogen atom the oxidation state is increasing from 0 to +1 while the oxidation state is decreasing from 0 to -1. Hence correct option is C

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