A gas is found to have the formula $(C O)_{x}$ , If its vapor density is 70 then the value of $x$ must be:

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Solution

The correct option is D 5
Molecular weight $= 2 \times$ Vapor density $= 140$
Formula mass of $C O$ $= 28$
$x = \frac{140}{28} = 5$

So, the correct option is $B$

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