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States of Matter — NEET UG Chemistry PYQs

414 previous year questions from States of Matter with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

414 questionsChemistrySolutions on every page
1

A steel cylinder of 8 litres capacity contain hydrogen gas at 12 atm pressure, At same temperature, how many cycle tubes of 4 litre capacity at 2 atmphere can be filled up with thi

MHT CET Medical 2026 Solution View → 2

The volume occupied by a given mass of gas at 298 K is 35 mL at 1 atmospheric pressure. Calculate the volume of the gas if pressure is decreased to 0.75 atmosphere at constant temp

MHT CET Medical 2026 Solution View → 3

A bubble of air is underwater at temperature 15 ^ C and the pressure 1.5 bar . If the bubble rises to the surface where the temperature is 25 ^ C and the pressure is 1.0 bar , what

MHT CET Medical 2026 Solution View → 4

Calculate the work done terms of dm ^3 bar when 200 ml of ethylene gas and 150 ml of HCl gas were allowed to react at 1 bar pressure.

MHT CET Medical 2026 Solution View → 5

A force of 450 N acts on a surface area of 15 cm ^2 . Find the pressure exerted.

MHT CET Medical 2026 Solution View → 6

Calculate the pressure in atm of 48 g oxygen gas in a 2 dm ^3 container at 27 ^ C . [ R = 0.0821 atm dm ^3 K ⁻¹ mol ⁻¹ ]

MHT CET Medical 2026 Solution View → 7

Identify false statement about real gas from following .

MHT CET Medical 2026 Solution View → 8

Find the number of molecules in 0.25 m ^3 of the gas at a pressure 2.0 10^2 kPa and a temperature 300 K . [R = 8.314 J K ⁻¹ mol ⁻¹]

MHT CET Medical 2026 Solution View → 9

Which of the following relations is correct regarding rate of diffusion of a gas?

MHT CET Medical 2026 Solution View → 10

The density of a gas at 27^ C and 1 atm pressure is 2.6 g/dm ^3 . What is molar mass of gas? [R = 0.0821 L atm K ⁻¹ mol ⁻¹]

MHT CET Medical 2026 Solution View → 11

Which amongst the following options is correct graphical representation of Boyle's Law?

NEET 2023 Solution View → 12

The correct option in which the density of argon (Atomic mass =40 ) is highest

NEET 2023 Solution View → 13

The correct van der Waals equation for 1 mole of a real gas is

NEET 2023 Solution View → 14

Four gas cylinders containing He , N ₂, CO ₂ and NH ₃ gases separately are graudally cooled from a temperature of 500 ~K . Which gas will liquify first ? (Given T _ C in K - He : 5

NEET 2022 Solution View → 15

A vessel contains 3.2 ~g of dioxygen gas at STP (273.15 K and 1 atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes one thir

NEET 2022 Solution View → 16

A 10 . 0   L flask contains 64   g of oxygen at 27 ° C . (Assume O 2 gas is behaving ideally). The pressure inside the flask in bar is (Given R = 0 . 0831   L &

NEET 2022 Solution View → 17

Which one is not correct mathematical equation for Dalton's Law of partial pressure? Here P = total pressure of gaseous mixture

NEET 2022 Solution View → 18

Choose the correct option for graphical representation of Boyle's law, which shows a graph of pressure vs. volume of a gas at different temperatures:

NEET 2021 Solution View → 19

Choose the correct option for the total pressure (in atm.) in a mixture of 4 g   O 2 and 2 g   H 2 confined in a total volume of one litre at 0 ° C is [Given R = 0 .

NEET 2021 Solution View → 20

The minimum pressure required to compress 600   dm 3 of a gas at 1 bar to 150   dm 3 at 40 ° C is

NEET 2020 Solution View → 21

A mixture of N 2 and Ar gases in a cylinder contains 7   g of N 2 and 8   g of Ar . If the total pressure of the mixture of the gases in the cylinder is 27 bar, the parti

NEET 2020 Solution View → 22

Assertion : A spherical water drop becomes flat on flat surface. Reason : It becomes flat due to gravity.

AIIMS 2019 Solution View → 23

Assertion : Liquefaction of NH ₃ is easier than CO ₂ . Reason : T_c of CO ₂ is more than that of NH ₃ .

AIIMS 2019 Solution View → 24

Moles of N ₂=0.4 and moles of O ₂=0.1 find p _ N ₂ (Partial pressure) N ₂= ?at atmospherim pressure

JIPMER 2019 Solution View → 25

In an ideal gas equation which is constant?

JIPMER 2019 Solution View → 26

If V =1 litre, 10 mole of H ₂ and 10 mole of N ₂ gas are mixed at temperature 26^ C , then calculate pressure of the gas.

JIPMER 2019 Solution View → 27

A gas at 350   K and 15 bar has a molar volume 20 per cent smaller than that for an ideal gas under the same conditions. The correct option about the gas, and its compressibil

NEET 2019 Solution View → 28

The volume occupied by 1.8 ~g of water vapour at 374^ C and 1 bar pressure will be [Use R =0.083 bar L K ⁻¹ ~mol ⁻¹ ]

NEET 2019 Solution View → 29

Two separate bulbs contain gas A and gas B . The density of gas A is twice as that of B . The molecular mass of A is half as that of B . If temperature is constant, the ratio of th

AIIMS 2018 Solution View → 30

Assertion : Greater the value of van der Waals' constant ' a ' greater is the liquefaction of gas. Reason : ' a ' indirectly measures the magnitude of attractive forces between the

AIIMS 2018 Solution View → 31

When 1 ~g of gas A at 4 bar pressure is added to 2 ~g of gas B , the total pressure inside the container becomes 6 bar. Which of the following is true?

AIIMS 2018 Solution View → 32

Gas in a cylinder is maintained at 10 ~atm pressure and 300 ~K temperature. The cylinder will explode if pressure of gas goes beyond 15 atm. What is the maximum temperature to whic

AIIMS 2018 Solution View → 33

In van der Waals equation at constant temperature 300 ~K , if a=1.4 ~atm ~L ~mol ⁻² , V=100 ~mL , n=1 ~mole , then what is the pressure of the gas?

AIIMS 2018 Solution View → 34

A 100 mL flask contained H ₂ at 200 torr, and a 200 mL flask contained He at 100 torr. The two flask were then connected so that each gas filled their combined volume. Assume, no c

JIPMER 2018 Solution View → 35

Given, van der Waal's constant for NH 3 ,   H 2 ,   O 2 and CO 2 are respectively 4 . 17 ,   0 . 244 ,   1 . 36   and   3 . 59 . Which one of the

NEET 2018 Solution View → 36

The correction factor 'a' to the ideal gas equation corresponds to which of the following?

NEET 2018 Solution View → 37

The density of a gas A is thrice that of a gas B at the same temperature. The molecular weight of gas B is twice that of A . What will be the ratio of the pressures acting on B and

AIIMS 2017 Solution View → 38

The compressibility of a gas is less than unity at STP, therefore

JIPMER 2017 Solution View → 39

A 20   litre container at   400   K contains CO 2 g at pressure 0 . 4   atm and an excess of SrO (neglect the volume of solid SrO ). The volume of the container

NEET 2017 Solution View → 40

Assertion : Critical temperature of CO ₂ is 304 ~K , it cannot be liquified above 304 ~K . Reason : At a certain temperature, volume 1 pressure

AIIMS 2016 Solution View → 41

Temperature of a gas is t ~K . What would be the temperature at which volume and pressure, both will reduced to half of the initial values?

JIPMER 2016 Solution View → 42

Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen escape in the time required for one-ha

NEET 2016 Solution View → 43

0.40 g of helium in a bulb at a temperature of T ~K had a pressure of p atm. When the bulb was immersed in water bath at temperature 50 K more than the first one, 0.08 g of gas had

JIPMER 2015 Solution View → 44

Given that the reduced temperature, = T T_C the reduced pressure, = F F_C the reduced volume, = V V_C Thus, it can be said that the reduced equation of state may be given as

JIPMER 2015 Solution View → 45

A gas such as carbon monoxide would be most likely to obey the ideal gas law at:

NEET 2015 Solution View → 46

Equal masses of H 2 ,   O 2 and methane have been taken in a container of volume V at temperature 27 o C in identical conditions. The ratio of the volumes of gases H 2 : O 2 :

NEET 2014 Solution View → 47

Assertion : At critical point the densities of substance in gaseous and liquid states are same. Reason : Critical temperature is the temperature at which the real gas exhibit ideal

AIIMS 2013 Solution View → 48

The average kinetic energy of an ideal gas per molecule in SI units at 25^ C will be

JIPMER 2013 Solution View → 49

What is the density of N ₂ at 227^ C and 5.00 ~atm pressure? ( R =0.082 ~L ~atm ~K ⁻¹ . . mol ⁻¹ )

NEET 2013 Solution View → 50

Assertion : In a pressure cooker, the water is brought to boil. The cooker is then removed from the stove. Now on removing the lid of pressure cooker, the water starts boiling agai

AIIMS 2012 Solution View → 51

Arrange the following gases in order of their critical temperature. NH ₃, H ₂ O , CO ₂, O ₂

AIIMS 2012 Solution View → 52

50 ~mL of each gas A and of gas B takes 150 and 200 ~s respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is 36 , the molecular m

NEET 2012 Solution View → 53

A certain gas takes three times as long to effuse out as helium. Its molecular mass will be

NEET 2012 Solution View → 54

For real gases van der Waals' equation is written as (p+ a n^2 V^2 )(V-n b)=n R T where, a and b are van der Waals' constants. Two sets of gases are I. O ₂, CO ₂, H ₂ and He II. CH

NEET 2012 Solution View → 55

Equal volumes of two monoatomic gases, A and B , at same temperature and pressure are mixed. The ratio of specific heats (c_p / c_V ) of the mixture will be

NEET 2012 Solution View → 56

In the van der Waals equation, ' a ' signifies

AIIMS 2011 Solution View → 57

56 g of nitrogen and 96 g of oxygen are mixed isothermally and at a total pressure of 10 atm . The partial pressures of oxygen and nitrogen (in atm) are respectively

JIPMER 2011 Solution View → 58

By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?

NEET 2011 Solution View → 59

Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49 u . Molecular mass of B will be

NEET 2011 Solution View → 60

A bubble of air is underwater at temperature 15^ C and the pressure 1.5 ~bar . If the bubble rises to the surface where the temperature is 25^ C and the pressure is 1.0 ~bar , what

NEET 2011 Solution View → 61

A gaseous mixture was prepared by taking equal moles of CO and N ₂ . If the total pressure of the mixture was found 1 atmosphere, the partial pressure of the nitrogen ( N ₂ ) in th

NEET 2011 Solution View → 62

Two flasks X and Y have capacity 1 ~L and 2 ~L respectively and each of them contains 1 mole of a gas. The temperatures of the flasks are so adjusted that average speed of molecule

AIIMS 2010 Solution View → 63

Equal weight of CO and CH ₄ are mixed together in an empty container at 300 ~K . The fraction of total pressure exerted by CH ₄ is

AIIMS 2010 Solution View → 64

The density of a gas is found to be 1.56 ~g / L at 745 mm pressure and 65^ C . What is the moleculer mass of the gas?

JIPMER 2010 Solution View → 65

The pressure exerted by 6.0 ~g of methane gas in a 0.03 ~m ^3 vessel at 129^ C is (Atomic masses : C =12.01, H =1.01 and R =8.314 JK ⁻¹ ~mol ⁻¹ )

NEET 2010 Solution View → 66

The variation of volume V , with temperature T , keeping pressure constant is called the coefficient of thermal expansion ( ) of a gas. i.e., = 1 V ( V T )_P . For an ideal gas is

AIIMS 2009 Solution View → 67

Assertion : Compressibility factor for hydrogen varies with pressure with positive slope at all pressure. Reason : Even at low pressure, repulsive forces dominate for hydrogen gas

AIIMS 2009 Solution View → 68

The most probable velocity (in cm / s ) of hydrogen molecule at 27^ C will be

JIPMER 2009 Solution View → 69

The mean free path of electrons in a metal is 4 10⁻⁸ ~m . The electric field which can give on an average 2 eV energy to an electron in the metal will be in units of V / m :

NEET 2009 Solution View → 70

The energy absorbed by each molecule ( A ₂ ) of a substance is 4.4 10⁻¹⁹ ~J and bond energy per molecule is 4.0 10⁻¹⁹ ~J . The kinetic energy of the molecule per atom will be :

NEET 2009 Solution View → 71

The root mean square speed of the molecules of diatomic gas is (u ). When the temperature is doubled, the molecules dissociate into two atoms. The new rms speed of the atom is

AIIMS 2008 Solution View → 72

Assertion : If ( H ₂ ) and ( Cl ₂ ) enclosed separately in the same vessel exert pressure of 100 and (200 ~mm ) respectively, their mixture in the same vessel at the same temperatu

AIIMS 2008 Solution View → 73

A gas mixture contains ( O ₂ ) and ( N ₂ ) in the ratio of (1: 4 ) by weight. The ratio of their number of molecules is

JIPMER 2008 Solution View → 74

The volume of a gas measured at (27^ C ) and 1 atm pressure is 10 L. To reduce the volume to 2 L at 1 atm pressure, the temperature required is

JIPMER 2008 Solution View → 75

If a gas expands at constant temperature, it indicates that

NEET 2008 Solution View → 76

In (P ) versus (V ) graph, the horizontal line is found in which ____ exists.

AIIMS 2007 Solution View → 77

Critical temperatures for (A, B, C ) and (D ) gases are (25^ C , 10^ C ,-80^ C ) and (15^ C ) respectively. Which gas will be liquefied more easily?

AIIMS 2007 Solution View → 78

Dominance of strong repulsive forces among the molecules of the gas ( Z= compressibility factor)

AIIMS 2006 Solution View → 79

A certain sample of gas has a volume of 0.2 L measured at 1 atm pressure and 0^ C . At the same pressure but 273^ C , its volume will be :

JIPMER 2006 Solution View → 80

Assertion : Compressibility factor for hydrogen varies with pressure with positive slope at all pressures. Reason : Even at low pressures, repulsive forces dominate hydrogen gas.

AIIMS 2005 Solution View → 81

Ratio of molecular weights of A and B is 4 25 then ratio of rates of diffusion will be

JIPMER 2005 Solution View → 82

a / V ^2 given in van der Waal's equation is for

JIPMER 2005 Solution View → 83

When the temperature of an ideal gas is increased from 27^ C to 927^ C , the kinetic energy will be

JIPMER 2005 Solution View → 84

The surface tension of which of the following liquid is maximum?

NEET 2005 Solution View → 85

Assertion : Effusion rate of oxygen is smaller than nitrogen. Reason : Molar mass of nitrogen is smaller than oxygen.

AIIMS 2004 Solution View → 86

If P is pressure and is density of a gas, then P and are related as

AIIMS 2002 Solution View → 87

Under which conditions van der Waals real gas acts as an ideal gas?

NEET 2002 Solution View → 88

How do experiments by Boyle demonstrate the compressibility of gases?

NEET Solution View → 89

What does the Maxwell-Boltzmann distribution of speeds provide information about?

NEET Solution View → 90

In gravity-free environments, how do drops behave?

NEET Solution View → 91

What is the condition under which a substance always remains in one phase?

NEET Solution View → 92

Which gas law is associated with the statement that the product of pressure and volume is constant?

NEET Solution View → 93

What is the significance of Boyle temperature or Boyle point for real gases?

NEET Solution View → 94

What disappears at the critical temperature of a substance?

NEET Solution View → 95

Why are perfectly elastic collisions important for the behavior of gases?

NEET Solution View → 96

What happens to gases before they reach the temperature of Absolute zero?

NEET Solution View → 97

What is the mean square speed a direct measure of?

NEET Solution View → 98

What is the reason for the decrease in viscosity as temperature rises in a liquid?

NEET Solution View → 99

What does the equation p1V1/T1 = p2V2/T2 represent?

NEET Solution View → 100

What is the relationship between pressure, volume, temperature, and moles described by the ideal gas equation?

NEET Solution View → 101

How is surface tension defined in terms of force and length?

NEET Solution View → 102

What shape satisfies the condition of having the lowest energy state for a liquid?

NEET Solution View → 103

What does the term "A" represent in the equation F ∝ ηA × du/dz?

NEET Solution View → 104

At what temperature does the graph of volume vs. temperature (in Celsius) intercept the temperature axis when extended to zero volume for all gases?

NEET Solution View → 105

If a gas at constant temperature undergoes expansion, what happens to its volume and pressure, according to Boyle's law?

NEET Solution View → 106

What quantity is required to determine the average translational kinetic energy of a gas particle in a straight line?

NEET Solution View → 107

By how much does the volume of a gas increase for each degree rise in temperature, according to Charles and Gay Lussac's experiments?

NEET Solution View → 108

What is the effect of increased temperature on the effectiveness of intermolecular attraction?

NEET Solution View → 109

What is the rearranged form of the ideal gas equation in terms of density and molar mass?

NEET Solution View → 110

What happens to real gases when intermolecular forces are practically negligible?

NEET Solution View → 111

What is the main parameter that affects the distribution of molecular speeds?

NEET Solution View → 112

What is the relationship between temperature and the distribution of molecular speeds?

NEET Solution View → 113

What is the mathematical representation of Dalton's law of partial pressure?

NEET Solution View → 114

In laminar flow, how does the velocity change from one layer to the next as you move away from the fixed surface?

NEET Solution View → 115

What would happen to gases if there were a loss of kinetic energy during collisions?

NEET Solution View → 116

What is the primary characteristic of gas particles?

NEET Solution View → 117

What is the purpose of plotting pV vs. p for gases at constant temperature?

NEET Solution View → 118

Which gas law describes the relationship between pressure and volume at constant temperature?

NEET Solution View → 119

What does STP stand for in the context of gases?

NEET Solution View → 120

How does the most probable speed change with increasing temperature?

NEET Solution View →
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