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31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - NEET MCQ


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30 Questions MCQ Test Chemistry Class 11 - 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT)

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) for NEET 2024 is part of Chemistry Class 11 preparation. The 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) below.
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31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 1

If P, V, M, T and R are pressure, Volume, molar mass, temperature and gas constant respectively, then for an ideal gas, the density is given by

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 1

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 2

Pressure remaining the same, the volume of a given mass of an ideal gas increases for every degree centigrade rise in temperature by definite fraction of its volume at [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 2

Charle’s Law - The volume of the given mass of a gas increases or decreases by of its volume at 0°C for each degree rise or fall of temperature at constant pressure.

at constt. Pressure

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31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 3

Correct gas equation is : [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 3

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 4

Root mean square velocity of a gas molecule is proportional to [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 4

According to kinetic gas equatiion

 u = root mean square velocity

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 5

Absolute zero is defined as the temperature

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 5

Absolute zero is the temperature at which kinetic energy of gas molecules becomes zero i.e. all molecular motion ceases.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 6

In vander Waal's equation of state for a non-ideal gas, the term that accounts for intermolecular forces is : [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 6

Vander Waal's equation for 1 mole :

Here,  represent the intermolecularforces. (V – b) is the corrected volume.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 7

A gas is said to behave like an ideal gas when the relation PV/T = constant. When do you expect a real gas to behave like an ideal gas ? [1991]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 7

At low pressure and high temperature: At low pressure volume correction for 1 mole of a gas in negligible, i.e b = 0 thus the gas equation becomes

At higher pressure, the pressure correction for 1 mole of gas in negligible i.e 

or (P + 0) (V – b) = RT
or P (Vm – b) = RT
or PVm = RT + Pb

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 8

In a closed flask of 5 litres, 1.0 g of H2 is heated from 300 to 600 K. Which statement is not correct?

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 8

Here volume is constant. Again the mass of H2 is fixed so the number of moles of the gas do not change. As temperature increases the pressure also increases. The rate of collision among the gas molecules and their energy also increases.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 9

At constant temperature, for a given mass of an ideal gas [1991]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 9

According to Boyle’s law at constant temperature,  = constant

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 10

The root mean square speeds at STP for the gases H2, N2, O2 and HBr are in the order : [1991]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 10

i.e higher will be the molar mass lower will be the value of urms.
Molecular masses of H2, N2, O2 and HBr are 2, 28, 32 and 81. Hence the correct order is HBr < O2 < N2 < H2

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 11

A closed flask contains water in all its three states solid, liquid and vapour at 0°C. In this situation, the average kinetic energy of water molecules will be[1992]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 11

Velocity and hence the K.E is  maximum in the gaseous state.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 12

Which is not true in case of an ideal gas ? [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 12

Molecules in an ideal gas move with different speeds.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 13

The correct value of the gas constant ‘R’ is close to :[1992]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 13

R = 0.082 litre atm K–1 mole–1 .

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 14

An ideal gas can’t be liquefied because [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 14

In the ideal gas, the intermolecular forces of attraction are negligible and hence it cannot be liquefied.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 15

Select one correct statement. In the gas equation, PV = nRT [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 15

In the equation PV = nRT, n moles of the gas have volume V.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 16

At STP, 0.50 mol H2 gas and 1.0 mol He gas

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 16

Average kinetic energy depends only on temperature

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 17

Under what conditions will a pure sample of an ideal gas not only exhibit a pressure of 1 atm but also a concentration of 1 mole litre–1 ? (R = 0.082 litre atm mol–1deg–1) [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 17

Hence 1 = 1 × 0.082 × T is 

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 18

Internal energy and pressure of a gas per unit volume are related as : [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 18

per unit vol.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 19

The ratio among most probable velocity, mean velocity and root mean square velocity is given by
[1993]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 19

Most probable velocity 

Mean velocity 

Root mean square velocity 

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 20

When is deviation more in the behaviour of a gas from the ideal gas equation PV = nRT ? [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 20

At low temperature and high pressure.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 21

The temperature of the gas is raised from 27°C to 927°C, the root mean square velocity is [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 21

 

u2 = 2u1

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 22

In a pair of immiscible liquids, a common solute dissolves in both and the equilibrium is reached.Then the concentration of the solute in upper layer is[1994]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 22

By definition of Nernst distribution law.
When a solute is shaken with two immiscible liquids, having solubility in both, the solute distributes itself between the two liquids in such a way that the ratio of its concentrations in two liquids is constant at a given temperature, provided the molecular state of the solute remains the same in both the liquids.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 23

A liquid can exist only : [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 23

A substance exists as a liquid above its m. pt. and below its b. pt.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 24

500 ml of nitrogen at 27°C is cooled to –5°C at the same pressure. The new volume becomes

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 24

Given initial volume (V1) = 500 ml ; Initial temperature (T1) = 27ºC = 300 K and final temperature (T2) = –5ºC = 268 K.
From Charle’s law :

Where V2 = New volume of gas

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 25

600 c.c. of a gas at a pressure of 750 mm is compressed to 500 c.c. Taking the temperature to remain constant, the increase in pressure, is

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 25

Given initial volume (V1) = 600 c.c.;
Initial pressure (P1) = 750 mm and final volume (V2) = 500 c.c. according to Boyle’s law,

P1V1 = P2V2
 or 750 × 600 = P2 × 500

Therefore increase in pressure = (900 – 750)              

= 150 mm.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 26

Cyclopropane and oxygen at partial pressures 170 torr and 570 torr respectively are mixed in a gas cylinder. What is the ratio of the number of moles of cyclopropane to the number of moles of oxygen (nC3H6/nO2)? [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 26

By Ideal gas equation P1V =  n1RT  

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 27

At which one of the following temperatur e -pressure conditions the deviation of a gas from ideal behaviour is expected to be minimum? [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 27

At low pressure and high temperature real gas nearly behave like ideal gas. Hence deviation is minimum from ideal behaviour.

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 28

From a heated mixture of nitrogen, oxygen and carbon, two compounds (out of the many obtained) are isolated. The rates of diffusion of the two isolated compounds are almost identical.The two compounds are [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 28

Rate of diffusion depend upon molecular weight

r1 = r2 if M1 = M2

Hence compounds are N2O and CO2 as both have same molar  mass i.e 22

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 29

If 500 ml of gas A at 400 torr and 666.6 ml of B at 600 torr are placed in a 3 litre flask, the pressure of the system will be [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 29

Applying Boyle's law P1V1 = P2V2 for both gase

31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 30

A gaseous mixture contains H2 and O2 in the molar ratio 8 : 1. The ratio of H2 : O2 by weight in this mixture would be [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: States of Matter - 2 (Old NCERT) - Question 30

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