The water can be made to boil even at $0$ if the pressure of surrounding is:

56 cm of Hg

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5 cm of Hg

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0.1 cm of Hg

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4.6 mm of Hg

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Solution

The correct option is A 56 cm of Hg
The water can be made to boil even at $0^{\circ} C$ .
As we know, the ideal equation for gases is $p V = n R T$ . Now, if $V$ and $n$ are taken constants, $p = c T$ , where $c$ is a constant.
So pressure is directly proportional to the temperature.
Water boils at $100^{\circ} C$ or $373 K$ at $1 a t m$ pressure. So, to obtain boiling at $0^{\circ} C$ or $273 K$ , you need to reduce the pressure to $\frac{273 \times 1}{373} a t m = 0.732 a t m = 56 cm of Hg$ (approx).

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The water can be made to boil even at 0 if the pressure of surrounding is:

The water can be made to boil even at $0$ if the pressure of surrounding is: