In which of the following reactions, the...

In which of the following reactions, the underlined substance has been reduced ?

A

`underline(CO)+CuOrarrunderline(CO_(2))+Cu`

B

`underline(CuO)+2HClrarrunderline(CuCl_(2))+H_(2)O`

C

`underline(4H_(2)O(g))+3Ferarrunderline(4H_(2)(g))+Fe_(3)O_(4)`

D

`underline(C)+HNO_(3)rarrunderline(CO_(2))+2H_(2)O+4NO_(2)`

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The correct Answer is:

C

In `H_(2)O` (O.N. of H = +1). Since it changes to `H_(2)` gas (O.N. = zero)
`:.` decrease in O.N. is reduction.

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