In which of the following reactions the underlined substance is oxidised?

3 M g + N_{2} - - - = M g_{3} N_{2}

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2 K I + B r_{2} - -- - = 2 K B r + I_{2}

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C u O - --- - + H_{2} = C u + H_{2} O

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C O - -- - + C l_{2} = C O C l_{2}

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Solution

The correct option is D $C O - -- - + C l_{2} = C O C l_{2}$
Substance is said to be oxidised when it loses electron during a reaction.
In A) reaction $N$ changes its oxidation state from 0 to -3 so it is reduced.
In B) reaction $B r$ changes its oxidation state from 0 to -1 so it is reduced.
In C) reaction $C u$ changes its oxidation state from +2 to 0 so it is reduced.
In D) reaction $C O$ changes its oxidation state from 0 to +2 so it is oxidised.
D) is the only reaction in which underlined substance is oxidised.

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N a H + H_{2} O \to N a O H + H_{2}

3 M g + N_{2} \to M g_{3} N_{2}

S n C l_{2} + B r_{2} \to S n C l_{2} . B r_{2}

2 C u S O_{4} + 4 K I \to C u_{2} I_{2} + K_{2} S O_{4} + I_{2}

C u O + H_{2} \to C u + H_{2} O

C u O + H_{2} \to C u + H_{2} O

C u O + H_{2} \to C u + H_{2} O

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