UPS 3 SK015 SEMESTER I SESSION 2020/2021

Which of the following statements is NOT a statement of the Kinetic Molecular Theory?

• The unit for temperature is in Kelvin.

• Volume of gas molecules are negligible.

• The collisions between the gas particles are elastic.

• The volume occupied by a gas increases with temperature.

Under what condition does hydrogen gas deviates from an ideal gas behaviour?

• Temperature : Low

  Pressure : High

• Temperature : High

  Pressure : Low

• Temperature : Low

  Pressure : Low

• Temperature : High

  Pressure : High

At a fixed volume. The gas pressure in a vessel is 2.0 atm at 25 ⁰C. Find the pressure if it is heated to 250 ⁰C.

[Ideal gas constant, R = 8.314 J mol^-1 K^-1 ; R = 0.08206 L atm mol^-1 K^-1]

[Pressure : 1 atm = 760 mmHg = 760 torr = 101 325 Pa = 101 325 N m^-2]

[Temperature 0 ⁰C = 273.15 K]

• 1.14 atm

• 3.51 atm

• 20.0 atm

• 35.1 atm

A sample of gas exert 1000 torr of pressure at 333 K has the mass of 3.00 g. If the molar mass of the gas sample is 28 g/mol, calculate the volume occupied by this gas.

[Ideal gas constant, R = 8.314 J mol^-1 K^-1 ; R = 0.08206 L atm mol^-1 K^-1]

[Pressure : 1 atm = 760 mmHg = 760 torr = 101 325 Pa = 101 325 N m^-2]

[Temperature 0 ⁰C = 273.15 K]

• 2.23 L

• 2.42 L

• 22.3 L

• 240 L

A mixture of 40.0 g oxygen and 25.0 g nitrogen gas are placed in a closed vessel of 8.10 L at 25 ⁰C. Calculate the total pressure of the mixture.

[Ideal gas constant, R = 8.314 J mol^-1 K^-1 ; R = 0.08206 L atm mol^-1 K^-1]

[Pressure : 1 atm = 760 mmHg = 760 torr = 101 325 Pa = 101 325 N m^-2]

[Temperature 0 ⁰C = 273.15 K]

• 0.38 atm

• 0.54 atm

• 6.47 atm

• 6.65 atm

Which of the following statements is not true about gas?

• When the ideal gas molecules collide, there is no kinetic energy loss.

• Pressure exerted by the real gas is more than that of an ideal gas.

• The attractive forces between gas molecules for an ideal gas are negligible.

• At a constant pressure and number of mole, the volume occupied by an ideal gas is directly proportional to temperature.

Under the same temperature and pressure, the particles in a sample of liquid ____________________________.

• have the same strength of intermolecular forces.

• have the same tendency to evaporate.

• have the same average kinetic energy

• have the same vapour pressure.

Which of the following quantities is independant to the strength of attractive forces between liquid molecules?

• solubility

• surface tension

• viscosity

• vaporisation

• I only

• I and II

• II and III

• I, II and III

• I only

• I and II

• II and III

• I, II and III