Dipole induced-dipole interactions are present in which of the following pairs?
[A] HCl and He atoms
[B] SF4 and He atoms
[C] H2O and alcohol
[D] Cl2 and CCl4
The interaction energy of London forces is
[A] directly proportional to r6
[B] inversely proportional to 1/r6
[C] inversely proportional to r3
[D] inversely proportional to 1/r3
Which one of the following options is/are correct?
[A] intennolecular forces tend to keep the molecules together.
[B] Thermal energy of the molecules tends to keep them apart
[C] Both of the above
[D] None of the above
The interaction between a polar and non-polar molecule is known as
[A] Dipole-induced dipole interaction
[B] Dipole Dipole interaction
[C] Ion dipole interaction
[D] None of the above
Energy of hydrogen bond varies between
[A] 10 to 100 kJ mol-1
[B] 10 to 50 kJ mol-1
[C] 100 to 150 kJ mol-1
[D] 100 to 200 kJ mol-1
A certain gas takes three times as long to effuse out as helium. Its molecular mass will be
[A] 27 g mol-1
[B] 36 g mol-1
[C] 6 g mol-1
[D] 9 g mol-1
100 ml O2 and H2 are kept at same temperature and pressure. What is true about their number of molecules?
[A] NO2 > NH2
[B] NO2 > NH2
[C] NO2= NH2
[D] NO2 + NH2 = 1 mole
Equal masses of He, O2 and SO2 are taken in a closed container. The ratio of the partial pressures of gases He, O2 and SO2 would be
Dimension of universal gas constant R is
A bubble of air is underwater at temperature 15℃ and the pressure 1.5 bar of the bubble rises to the surface where the temperature is 25℃ and the pressure is 1.0 bar, what will happen to the volume of the bubble?
[A] Volume will become greater by a factor of 1.6
[B] Volume will become greater by a tact or of 1.1
[C] Volume will become smaller by a factor of 0.70
[D] Volume will become greater by a factor of 2.5
A and B are Ideal gases. The molecular weights of A and B are in the ratio of 1:4. The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture?
A mixture contains 16 g of oxygen, 28 g of nitrogen and 8 g of CH4. Total pressure of mixture is 740 mm. What is the partial pressure of nitrogen in the mixture?
[A] 185 mm
[C] 555 mm
A given mass of a gas obeys Boyle’s law at a certain temperature.Which one of the plots will not give a straight line?
[A] V versus 1/P
[B] P versus 1/V
[C] log P versus log V
[D] P versus V
Which of the following is a representation of Charles’ law?
A sample of gas has a volume of 0.2 L measured at 1 atm pressure and 0℃. At the same pressure but at 273℃, its volume becomes
[A] 0.1 L
[B] 0.4 L
[C] 0.8 L
[D] 0.6 L
Equal masses of methane and oxygen introduced into a vessel at 27℃.
What fraction of the total pressure is due to oxygen?
If 10-4 dm3 of water is introduced into a 1 dm3 flask at 300 K, how many moles of water are in the vapour phase when equilibrium is established
(given, vapour pressure of H2O at 300 K is 3170 Pa; R = 8.314 JK-1mol-1)?