Why does a sharp glass edge become smooth on heating it up to its melting point in a flame? Explain which property of liquids is responsible for this phenomenon.

When $48 \, L$ of dry $N_2$ gas at $27 \, ^oC$ is passed through $36 \, g$ of water,the weight of water decreases by $1.20 \, g$. What is the vapor pressure of water in $atm$?

At $300 \ K$ and $760 \ torr$ pressure,the density of a mixture of $He$ and $O_2$ gases is $0.543 \ g \ L^{-1}$. The mass percent of oxygen is approximately $(R = 0.0821 \ L \ atm \ K^{-1} \ mol^{-1})$

The vapor pressure of water at $80\,^oC$ is $355.5\, mm\, of\, Hg$. $A$ $100\, mL$ vessel contains $O_2$ saturated with water vapor at $80\,^oC$,and the total pressure is $760\, mm\, of\, Hg$. If the contents are transferred to a $50\, mL$ vessel at the same temperature,what will be the partial pressure of $O_2$ in $mm\, Hg$?

Identify the correct statements from the following.
$I$. Glass is an extremely viscous liquid.
$II$. Increase in temperature decreases the surface tension of liquids.
$III$. Compressibility factor for an ideal gas is zero.

Two statements are given below.
Statement-$I$: Viscosity of liquid decreases with increase in temperature.
Statement-$II$: The units of viscosity coefficient are Pascal sec.
The correct answer is