DIRECTIONS : These are Assertion-Reason type questions. Each of these question contains two statements: Statement-1 (Assertion) and Statement-2 (Reason). Answer these questions from the following four options.

Statement – 1 : Greater the value of van der Waal’s constant ‘a’ greater is the liquefaction of gas.

Statement – 2 : ‘a’ indirectly measures the magnitude of attractive forces between the molecules.

Statement - 1 is true, Statement - 2 is true, Statement - 2 is a correct explanation for Statement - 1
Statement - 1 is True, Statement - 2 is True; Statement - 2 is NOT a correct explanation for Statement-1
Statement - 1 is True, Statement - 2 is False
Statement - 1 is False, Statement - 2 is True

Solution

Considering the attractive forces between gas molecules pressure in ideal gas equation (PV = nRT) is corrected by introducing a factor of ^an²⁄_V² where ‘a’ is a van der Waal’ss constant.

Statement – 1 : 1 mol of H2 and O2 each occupy 22.4 L of volume at 0°C and 1 bar pressure.

Statement – 2 : Molar volume for all gases at the same temperature and pressure has the same volume.

Statement - 1 is true, Statement - 2 is true, Statement - 2 is a correct explanation for Statement - 1
Statement - 1 is True, Statement - 2 is True; Statement - 2 is NOT a correct explanation for Statement-1
Statement - 1 is True, Statement - 2 is False
Statement - 1 is False, Statement - 2 is True

Solution

At STP one mole of each gas occupies 22.4L

Statement – 1 : Jet aeroplane flying at high altitude need pressurization of the cabin.

Statement – 2 : Oxygen is not present at higher altitude.

Statement - 1 is true, Statement - 2 is true, Statement - 2 is a correct explanation for Statement - 1
Statement - 1 is True, Statement - 2 is True; Statement - 2 is NOT a correct explanation for Statement-1
Statement - 1 is True, Statement - 2 is False
Statement - 1 is False, Statement - 2 is True

Solution

The air pressure decreases with increase in altitude. So the partial pressure of oxygen is not sufficient for breathing at higher altitude and thus pressurization is needed to increase the concentration of oxygen.

DIRECTIONS : Read the passage given below and answer the questions that follow :

1 mole of CCl₄ vapours at 77°C occupies a volume of 35 litre. vander Waal’s constants are a = 20.39 L² atm mol^-2 and b = 0.1383 L mol^-1.

At T = 500K, P = 40 atm, the state will be liquid
At T = 300K, P = 50 atm, the state will be gas
At T < 300K, P > 20 atm, the state will be gas
At 300K < T < 500 K, P > 50 atm, the state will be liquid

Solution

Inside the dome showing graph state is liquid.

DIRECTIONS : Read the passage given below and answer the questions that follow :

1 mole of CCl₄ vapours at 77°C occupies a volume of 35 litre. vander Waal’s constants are a = 20.39 L² atm mol^-2 and b = 0.1383 L mol^-1.

Calculate Z under high pressure region –

1.20
1.30
1.25
1.004

Solution

DIRECTIONS : Read the passage given below and answer the questions that follow :

1 mole of CCl₄ vapours at 77°C occupies a volume of 35 litre. vander Waal’s constants are a = 20.39 L² atm mol^-2 and b = 0.1383 L mol^-1.

Calculate Z under low pressure region –

0.98
0.90
0.84
0.80

Solution

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