A gaseous mixtures contains $N_{2}, O_{2}$ and $C O_{2}$ . It is passed over heated $M g$ , then overheated $C u$ and finally into aqueous $K O H$ , then:

N_{2}

remains unreacted

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N_{2}

and

O_{2}

remains unreacted

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N_{2}

and

C O_{2}

remains unreacted

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all gases are consumed

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Solution

The correct option is C all gases are consumed
(a) Mg reacts with $N_{2}$ as well as $O_{2}$ .
$3 M g + N_{2} Δ \to M g_{3} N_{2}$
(b) $O_{2}$ if left unreacted in (a) reacts with $C u$ .
$C u + O_{2} Δ \to 2 C u O$
(c) $K O H$ absorbs $C O_{2}$
$2 K O H + C O_{2} \to K_{2} C O_{3} + H_{2} O$
So it consumed all the gases
Hence option D is correct.

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