Assertion(A): The compressibility factor 'Z' is equal to the ratio of the molar volume of a real gas and the molar volume of an ideal gas.
Reason(R): 'Z' depends upon the pressure of real gas.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true and R is false.
4. A and R both are false.
Subtopic:  Compressibility Factor |
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Assertion(A): Above critical temperature liquid phase does not exist.
Reason(R): At critical temperature gas always shows non-ideal behaviour.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true and R is false.
4. A and R both are false.

Subtopic:  Liquefaction of Gases & Liquid |
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Assertion(A): The compressibility factor for hydrogen varies with pressure with a positive slope at all pressures.
Reason(R): Even at low pressures, repulsive forces dominate in hydrogen gas.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true and R is false.
4. A and R both are false.
Subtopic:  Compressibility Factor |
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Assertion: Liquids tend to have a maximum number of molecules at their surface.

Reason: Small liquid drops have a spherical shape.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true and the reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but the reason is true.

Subtopic:  Liquefaction of Gases & Liquid |
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Assertion: At the critical temperature, the liquid passes into a gaseous state imperceptible and continuously.

Reason: The density of the liquid and gaseous phase is equal to critical temperature.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true and the reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but the reason is true.

Subtopic:  Liquefaction of Gases & Liquid |
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Assertion: Gases do not liquefy above their critical temperature, even on applying high pressure.

Reason: Above the critical temperature, the molecular speed is high and intermolecular attractions cannot hold the molecules together because they escape because of high speed.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true and the reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but the reason is true.

Subtopic:  Liquefaction of Gases & Liquid |
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Assertion: The temperature at which the vapor pressure of a liquid is equal to the external pressure is called boiling temperature.

Reason: At high altitudes atmospheric pressure is high.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true and the reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but the reason is true.

Subtopic:  Liquefaction of Gases & Liquid |
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Assertion: At constant temperature, pV vs p plot for real gases is not a straight line.

Reason: At high pressure, all gases have Z>1 but at an intermediate pressure most gases have Z<1.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true and the reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but the reason is true.

Subtopic:  Compressibility Factor |
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Assertion: Three states of matter are the result of a balance between intermolecular forces and the thermal energy of the molecules.

Reason: Intermolecular forces tend to keep the molecules together but the thermal energy of molecules tends to keep them apart.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true and the reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but the reason is true.

Subtopic:  Introduction to States of Matter |
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Assertion: Critical temperatures for carbon dioxide and methane are 31.1 °C and –81.9 °C  respectively.

Reason: The intermolecular forces of attraction are stronger in CO2 than CH4

1.  Both assertion and reason are true and reason is the correct explanation of assertion
2.  Both assertion and reason are true, but reason is not the correct explanation of assertion
3.  Assertion is true, but reason is false
4.  Both Assertion and reason are false

Subtopic:  Liquefaction of Gases & Liquid |
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