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Case Based Questions Test: States of Matter (Old NCERT) - NEET MCQ


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8 Questions MCQ Test NCERT Based Tests for NEET - Case Based Questions Test: States of Matter (Old NCERT)

Case Based Questions Test: States of Matter (Old NCERT) for NEET 2024 is part of NCERT Based Tests for NEET preparation. The Case Based Questions Test: States of Matter (Old NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Case Based Questions Test: States of Matter (Old NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Case Based Questions Test: States of Matter (Old NCERT) below.
Solutions of Case Based Questions Test: States of Matter (Old NCERT) questions in English are available as part of our NCERT Based Tests for NEET for NEET & Case Based Questions Test: States of Matter (Old NCERT) solutions in Hindi for NCERT Based Tests for NEET course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt Case Based Questions Test: States of Matter (Old NCERT) | 8 questions in 16 minutes | Mock test for NEET preparation | Free important questions MCQ to study NCERT Based Tests for NEET for NEET Exam | Download free PDF with solutions
Case Based Questions Test: States of Matter (Old NCERT) - Question 1
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Real gases do not obey the gas equation PV = nRT. The extent of deviation is measured in terms of compressibility factor (Z). The Van Der Waal’s equation describes the behaviour of real gases. The liquefaction of the gases depends upon the value of Van Der Waal’s constant 'a' and 'b'. Answer the given questions (i) to (iv).

Q. Which set of conditions represent easiest way to liquefy a gas?

Detailed Solution for Case Based Questions Test: States of Matter (Old NCERT) - Question 1
At low temperature the kinetic energy of the gas molecule decreases and they cannot raise force of attraction. The gas molecules come closer and changes into liquid state. When pressure increases, the molecules of gases closer together due to decrease in volume.
Case Based Questions Test: States of Matter (Old NCERT) - Question 2
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Real gases do not obey the gas equation PV = nRT. The extent of deviation is measured in terms of compressibility factor (Z). The Van Der Waal’s equation describes the behaviour of real gases. The liquefaction of the gases depends upon the value of Van Der Waal’s constant 'a' and 'b'. Answer the given questions (i) to (iv).

Q. If Vo and Vi are the observed and ideal gas molar volume respectively, then Z for the gas is:

Detailed Solution for Case Based Questions Test: States of Matter (Old NCERT) - Question 2
Z for the gas is V0/Vi.
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Case Based Questions Test: States of Matter (Old NCERT) - Question 3
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Real gases do not obey the gas equation PV = nRT. The extent of deviation is measured in terms of compressibility factor (Z). The Van Der Waal’s equation describes the behaviour of real gases. The liquefaction of the gases depends upon the value of Van Der Waal’s constant 'a' and 'b'. Answer the given questions (i) to (iv).

Q. If V is the molar volume of the gas and gas obeys Van Der Waal’s equation, the intercept of the plot PV(y-axis) versus P (x-axis) is:

Detailed Solution for Case Based Questions Test: States of Matter (Old NCERT) - Question 3

At intercepts : V → ∞, PV = RT + Pb, This equation is a straight line equation. (Y = mx + c).

Case Based Questions Test: States of Matter (Old NCERT) - Question 4
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Real gases do not obey the gas equation PV = nRT. The extent of deviation is measured in terms of compressibility factor (Z). The Van Der Waal’s equation describes the behaviour of real gases. The liquefaction of the gases depends upon the value of Van Der Waal’s constant 'a' and 'b'. Answer the given questions (i) to (iv).

Q. The compressibility of a gas is less than unity at STP. Therefore:
Detailed Solution for Case Based Questions Test: States of Matter (Old NCERT) - Question 4

(Z = compressibility factor)

For one mole of real gas P = 1 atm, T = 273 K, R = 82.1 cm3 atm K−1 mol−1

Case Based Questions Test: States of Matter (Old NCERT) - Question 5
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Viscosity is the internal resistance to the flow possessed by a liquid. The internal resistance depends upon the intermolecular attractive forces. Liquids which flow rapidly have low internal resistance, small intermolecular forces and low viscosity. Glass is an extremely viscous liquid, hence, its properties resemble to that of solids.

Assertion: Effusion rate of Oxygen is smaller than nitrogen.

Reason: Molecular size of Nitrogen is smaller than Oxygen.
Detailed Solution for Case Based Questions Test: States of Matter (Old NCERT) - Question 5
Molecular mass of oxygen is greater than nitrogen. Effusion rate (γ) ∝ 1/√m it does not depend on molecular size.
Case Based Questions Test: States of Matter (Old NCERT) - Question 6
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Viscosity is the internal resistance to the flow possessed by a liquid. The internal resistance depends upon the intermolecular attractive forces. Liquids which flow rapidly have low internal resistance, small intermolecular forces and low viscosity. Glass is an extremely viscous liquid, hence, its properties resemble to that of solids.

Assertion: Vapour pressure is the characteristic property of liquids.

Reason: It does not depend upon the quantity of the liquid.
Detailed Solution for Case Based Questions Test: States of Matter (Old NCERT) - Question 6
Vapour pressure of a liquid depends on the temperature and nature of the liquid.
Case Based Questions Test: States of Matter (Old NCERT) - Question 7
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Viscosity is the internal resistance to the flow possessed by a liquid. The internal resistance depends upon the intermolecular attractive forces. Liquids which flow rapidly have low internal resistance, small intermolecular forces and low viscosity. Glass is an extremely viscous liquid, hence, its properties resemble to that of solids.

Assertion: Viscosity of the liquid decreases with decrease in temperature.

Reason: Kinetic energy of the molecules increases with increase in temperature.
Detailed Solution for Case Based Questions Test: States of Matter (Old NCERT) - Question 7
Viscosity of the liquid decreases with increase in temperature. The kinetic energy of the molecules increases which can overcome the intermolecular force between the molecules of the liquids.
Case Based Questions Test: States of Matter (Old NCERT) - Question 8
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Viscosity is the internal resistance to the flow possessed by a liquid. The internal resistance depends upon the intermolecular attractive forces. Liquids which flow rapidly have low internal resistance, small intermolecular forces and low viscosity. Glass is an extremely viscous liquid, hence, its properties resemble to that of solids.

Assertion: Viscosity of water is higher than ethanol.

Reason: Intermolecular forces in water are greater than ethanol.
Detailed Solution for Case Based Questions Test: States of Matter (Old NCERT) - Question 8
We found in an experiment using Ostwald's method that ethanol is more viscous than water, which is already surprising as water has stronger intermolecular bonds than ethanol as @MaxW pointed out. The mixture of both substances furthermore is significantly more viscous than both individual substances.
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