Inert gases are mixed in iodine vapours. Then there are _____ between them.

• H-bonding

• van der Waals forces

• electrostatic forces

• metallic bonds

Critical temperatures for A, B, C and D gases are 25°C, 10°C, -80°C and 15°C respectively. Which gas will be liquefied more easily?

• A

• B

• C

• D

Assertion : If H₂ and Cl₂ enclosed separately in the same vessel exert pressure of 100 and 200 mm respectively, their mixture in the same vessel at the same temperature will exert a pressure of 300 mm.

Reason : Dalton's law of partial pressures states that total pressure is the sum of partial pressures.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Which is the correct relation for diffusion of gases :

• r $\propto$ d

• r $\propto$ $\sqrt{\mathrm{d}}$

• r $\propto$ $\frac{1}{\sqrt{\mathrm{d}}}$

• none of these

If the r.m.s. speed of a gaseous molecule is x m/sec at a pressure P atm , then what will be the r.m.s. speed at a pressure 2P atm and constant temperature ?

• x

• 2x

• 4x

• x/4

The solution obtained by adding water to alcohol, shows :

• +ve deviation from Raoult's law

• ideal behaviour

• -ve deviation from Raoult's law

• application of Henry's law

If P is pressure and $\mathrm{\rho }$ is density of a gas, then P and $\mathrm{\rho }$ are related as :

• P $\propto$ $\mathrm{\rho }$

• P $\propto \left(\frac{1}{\mathrm{\rho }}\right)$

• P $\propto {\mathrm{\rho }}^2$

• P $\propto \left(\frac{1}{{\mathrm{\rho }}^2}\right)$

Intermolecular hydrogen bonding is strongest in

• methylamine

• phenol

• formaldehyde

• methanol

At a certain temperature, the value of the slope of the plot of osmotic pressure ($\mathrm{\pi }$) against concentration (C in molL^-1) of a certain polymer solution is 291R. The temperature at which osmotic pressure is measured, is (R is gas constant) 

• 271°C

• 18°C

• 564 K

• 18 K

The RMS velocity of CO gas molecules at 27°C is approximately 1000 m/s. For N₂ molecules at 600 K, the RMS velocity is approximately

• 2000 m/s

• 1414 m/s

• 1000 m/s

• 1500 m/s