Which of the following involve oxidation...

Which of the following involve oxidation and reduction?

`2Na+2H_(2)Orarr2NaOH+H_(2)`

`2CuI_(2)rarr2Cu+l_(2)`

`NH_(4)CI+NaOHrarrNaCI+NH_(3)+H_(2)O`

`4KCN+Fe(CN)_(6)rarrK_(4)[Fe(CN)_(6)]`

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The correct Answer is:

A, C

In both the reactions, there is change in O.N of the species

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Which of the following undergoes oxidation and reduction simultaneously in the presence of 50% NaOH ?

acetaldehyde

Acetone

Benzoic acid

Benzaldehyde

`NaBr+HClrarrNaCl+HBr`

`HBr+AgNO_(3)rarrAgBr+HNO_(3)`

`H_(2)+Br_(2)rarr2HBr`

`Na_(2)O+H_(2)SO_(4)rarrNa_(2)SO_(4)+H_(2)O`

`H_2 + Br_2 to 2 HBr`

`HBr + AgNO_3 to AgBr + HNO_3`

`NaBr + HCl to NaCl + HBr`

`Na_2O + H_2SO_4 to Na_2SO_4 + H_2O`