At $700$ $m m$ pressure, the density of a gas is $1.2$ $g / L$ . The pressure in $m m$ at which its density will be doubled is:

350

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175

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1050

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1400

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Solution

The correct option is D $1400$
The density of a gas is given by the following expression:

$d = \frac{P M}{R T}$ , where $M$ is molecular weight of the gas.

So, at a constant temperature, density is proportional to pressure.

Now, since density is doubled, pressure must also be doubled.

So, final pressure $= 2 \times 700 m m = 1400 m m$ .

Hence, the correct answer is option $D$ .

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At 700 mm pressure, the density of a gas is 1.2 g/L. The pressure in mm at which its density will be doubled is:

At $700$ $m m$ pressure, the density of a gas is $1.2$ $g / L$ . The pressure in $m m$ at which its density will be doubled is: