JEE Chemistry States Of Matter MCQs Set A

Question. Which of the following is not a type of van der Waal's forces?
(a) Ion - dipole forces
(b) London forces
(c) Dipole - induced dipole forces
(d) Dipole - dipole forces

Answer: A

Question. Who proposed the concept of dispersion force ?
(a) Fritz London
(b) van der Waal
(c) Gay Lussac
(d) Heitler and London

Answer: A

Question. The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles but their magnitude depends upon
(a) polarisability of interacting particles
(b) mass of interacting particles
(c) charge of interacting particles
(d) strength of permanent dipoles in the particles

Answer: A

Question. Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is
(a) less than unit electronic charge
(b) double the unit electronic charge
(c) equal to unit electronic charge
(d) more than unit electronic charge

Answer: A

Question. Dipole-dipole interaction is stronger than the London forces but is weaker than ion-ion interaction because
(a) only partial charges are involved
(b) only total charges are involved
(c) both
(d) None of these

Answer: A

Question. Induced dipole moment depend upon the
I. dipole moment present in the permanent dipole.
II polarisability of the electrically neutral molecules.
Identify the correct option.
(a) Both I and II are correct
(b) Both I and II are wrong
(c) I is wrong and II is correct
(d)   I is correct but II is wrong

Answer: A

Question. Dipole-induced dipole interactions are present in which of the following pairs :
(a) HCl and He atoms
(b) H₂O and alcohol
(c) Cl₂ and CCl₄
(d) None of these

Answer: A

Question. Which of the following exhibits the weakest intermolecular forces ?
(a) He
(b) HCl
(c) H₂O
(d) NH₃

Answer: A

Question.  Strength of the hydrogen bond is determined by interaction between the
I. lone pair of the electronegative atom and the hydrogen atom of other atom.
II. bond pair of the electronegative atom and the hydrogen atom of other atom.
Identify the correct option
(a) Only I is correct
(b) Only II is correct
(c) Both I and II are correct
(d) Neither I nor II are correct

Answer: A

Question. Which of the following statements regarding thermal energy is correct?
(a) All of the above
(b) Three states of matter are the result of balance between intermolecular forces and the thermal energy of the molecules.
(c) Intermolecular forces tend to keep the molecules together but thermal energy of the molecules tends to keep them apart
(d) Thermal energy is the measure of average kinetic energy of the particles of the matter and is thus responsible for movement of particles

Answer: A

Question. Which of the following is the correct order of thermal energy in three states of matter ?
(a) Solid < Liquid < Gas
(b) Liquid < Solid < Gas
(c) Liquid < Gas < Solid
(d) Gas < Solid < Liquid

Answer: A

Question.  Which of the following are arrangement in the correct order?
I. Gas > Liquid > Solid (Thermal energy)
II. Solid > Liquid > Gas (Intermolecular force)
Select the correct option.
(a) Both I and II
(b) I only
(c) II only
(d) None of these

Answer: A

Question. Which one of the following statements is not correct about the three states of matter i.e., solid, liquid and gaseous ?
(a) Gases like liquids possess definite volumes
(b) Molecules of a solid possess vibratory motion
(c) The density of solid is highest whereas that of gases is lowest
(d) Molecules of a solid possess least energy whereas those of a gas possess highest energy

Answer: A

Question. Which of the following is true about gaseous state ?
(a) Thermal energy >> Molecular attraction
(b) Thermal energy = Molecular attraction
(c) Thermal energy << Molecular attraction
(d) Molecular force >> Those in liquids

Answer: B

Question. The first reliable measurement on properties of gases was made by
(a) Robert Boyle
(b) Gay Lussac
(c) Jacques charles
(d) Avogadro

Answer: A

Question. At constant temperature, for a given mass of an ideal gas
(a) the product of pressure and volume always remains constant
(b) pressure always remains constant
(c) volume always remains constant
(d) the ratio of pressure and volume always remains constant

Answer: A

Question. Boyle’s law states that the
(a) pressure of a gas is inversely proportional the volume at constant temperature
(b) volume is directly proportional to the temperature at constant pressure
(c) None of the above
(d) pressure of a gas is directly proportional to the temperature at constant volume

Answer: A

Question. 600 c.c. of a gas at a pressure of 750 mm of Hg is compressed to 500 c.c. Taking the temperature to remain constant, the increase in pressure, is
(a) 150 mm of Hg
(b) 350 mm of Hg
(c) 250 mm of Hg
(d) 450 mm of Hg

Answer: A

Question. The lowest hypothetical or imaginary temperature at which gases are supposed to occupy zero volume is called _________
(a) absolute zero
(b) constant temperature
(c) Kelvin temperature
(d) Charle's temperature

Answer: A

Question. 500 ml of nitrogen at 27°C is cooled to –5°C at the same pressure. The new volume becomes
(a) 446.66 ml
(b) 771.56 ml
(c) 326.32 ml
(d) 546.32 ml

Answer: A

Question. Air at sea level is dense. This is a practical application of
(a) Boyle’s law
(b) Kelvin’s law
(c) Charle’s law
(d) Brown’s law

Answer: A

Question. Use of hot air balloons in sports and meteorological observations is an application of
(a) Charle’s law
(b) Gay-Lussac’s law
(c) Boyle’s law
(d) Kelvin’s law

Answer: A

Question. An ideal gas will have maximum density when
(a) P = 2 atm, T = 150 K
(b) P = 1 atm, T = 500 K
(c) P = 0.5 atm, T = 600 K
(d) P = 1 atm, T = 300 K

Answer: A

Question. On a ship sailing in pacific ocean where temperature is 23.4°C, a balloon is filled with 2 L air. What will be the volume of the balloon when the ship reaches Indian ocean, where temperature is 26.1°C ?
(a) 2.018 L
(b) 3.5 L
(c) 2.8 L
(d) 1.5 L

Answer: A

Question. At STP molar volume of an ideal gas or a combination of ideal gases is
(a) 22.71098 L mol^–1
(b) 22.4139 L mol^–1
(c) 20.71098 L mol^–1
(d) 24.78 L mol^–1

Answer: A

Question. 4.4 g of a gas at STP occupies a volume of 2.24 L, the gas can be
(a) CO₂
(b) CO
(c) O₂
(d) NO₂

Answer: A

Question. An ideal gas is one which obeys the gas laws under
(a) all experimental conditions
(b) low pressure alone
(c) high temperature alone
(d) a few selected experimental conditions

Answer: A

Question. For an ideal gas, number of moles per litre in terms of its pressure P, gas constant R and temperature T is
(a) P/RT
(b) PT/R
(c) PRT
(d) RT/P

Answer: A

Question. Select one correct statement. In the gas equation, PV = nRT
(a) n moles of the gas have a volume V
(b) P is the pressure of the gas when only one mole of gas is present
(c) V denotes volume of one mole of the gas
(d) n is the number of molecules of a gas

Answer: A

Question. Assertion : At critical temperature liquid passes into gaseous state imperceptibly and continuously.
Reason : The density of liquid and gaseous phase is equal to critical temperature.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.

Answer: A

Question. Assertion : The temperature at which vapour pressure of a liquid is equal to the external pressure is called boiling temperature.
Reason : At high altitude atmospheric pressure is high
(a) Assertion is correct, reason is incorrect
(b) Assertion is incorrect, reason is correct
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Assertion : Liquids tend to have maximum number of molecules at their surface.
Reason : Small liquid drops have spherical shape
(a) Assertion is incorrect, reason is correct
(b) Assertion is correct, reason is incorrect
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Arrange the following in increasing order their intermolecular interaction
(A) HCl (B) SF₆ and (C) NaCl
(a) B, A, C
(b) A, B, C
(c) A, C, B
(d) B, C, A

Answer: A

Question. When a sample of gas is compressed at constant temperature from 15 atm to 60 atm, its volume changes from 76 cm³ to 20.5 cm³. Which of the following statements are possible explanations of this behaviour?
(1) The gas behaves non-ideally
(2) The gas dimerises
(3) The gas is adsorbed into the vessel walls
(a) 1 only
(b) 1 and 2 only
(c) 1, 2 and 3
(d) 2 and 3 only

Answer: A

Question. Three different gases X, Y and Z of molecular masses 2, 16 and 64 were enclosed in a vessel at constant temperature till equilibrium is reached. Which of the following statement is correct?
(a) Gases will form homogenous mixture
(b) Gas Z will be at the bottom and X will be at the top
(c) Gas Y will be at the top of the vessel
(d) Gas Z will be at the top of the vessel

Answer: A

Question. Consider the case of hot air balloon, density of air at 20° C is 1.2Kg/m³, if the air was heated to 99°C, density of air becomes 0.94kg/m³. What would be the volume (in m³) at 20°C if the volume at 99°C is 2800 m³ and how much air (in kg) has been escaped at 99°C , if the air in inflated balloon was heated to 99°C (if the inflated volume of balloon was found to be 2800m³) respectively are
(a) 2243, 728
(b) 2687, 593
(c) 3495.3, 596
(d) 2956, 771

Answer: A

Question. 16 g of oxygen and 3 g of hydrogen are mixed and kept at 760 mm of Hg pressure and 0° C. The total volume occupied by the mixture will be nearly
(a) 44800 ml
(b) 33.6 litres
(c) 22.4 litres
(d) 448 litres

Answer: A

Question. The density of neon will be highest at
(a) 0ºC, 2 atm
(b) 273ºC, 2 atm.
(c) S.T.P.
(d) 273ºC, 1 atm

Answer: A

Question. At constant temperature, for a given mass of an ideal gas
(a) The product of pressure and volume always remains constant.
(b) Pressure always remains constant.
(c) Volume always remains constant.
(d) The ratio of pressure and volume always remains constant

Answer: A

Question. 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
(a) 200 torr
(b) 550 torr
(c) 100 torr
(d) 366 torr

Answer: A

Question. What is the partial pressure (mmHg) of nitrogen if total atmospheric pressure is 760mmHg ?
(a) 592.8
(b) 159
(c) 300
(d) 230

Answer: A

Question. An evacuated glass vessel weights 50 g when empty, 144.0 g when filled with a liquid of density 0.47 g ml^–1 and 50.5 g when filled with an ideal gas at 760 mm Hg at 300 K. The molar mass of the ideal gas is
(Given R = 0.0821 L atm K^–1 mol^–1)
(a) 61.575
(b) 130.98
(c) 47.87
(d) 123.75

Answer: A

Question.  The pressure of a 1:4 mixture of dihydrogen and dioxygen enclosed in a vessel is one atmosphere. What would be the partial pressure of dioxygen ?
(a) 0.25 atm
(b) 0.008 Nm^–2
(c) 0.8 × 10⁵ atm
(d) 8 × 10⁴ Nm^–1

Answer: A

Question. A neon-dioxygen mixture contains 70.6 g O₂ and 167.5 g neon. If pressure of the mixture of gases in the cylinder is 25 bar. What is the partial pressure of O₂ and Ne in the mixture respectively ?
(a) 5.75 bar, 19.75 bar
(b) 19.75 bar, 5.25 bar
(c) 5.25 bar, 10 bar
(d) 19.75 bar, 10 bar

Answer: A

Question. For a person travelling to the peak of the mountain which of the following statement(s) is/are correct ?
(i) Oxygen level goes on decreasing.
(ii) Gas law can be applied to this situation.
(a) Both (i) and (ii)
(b) Only (i)
(c) Only (ii)
(d) Neither (i) nor (ii)

Answer: A

Question. Pressure in well inflated tyres of automobiles is almost constant, but on a hot summer day this increases considerably and tyre may burst if pressure is not adjusted properly. During winters, on a cold morning one may find the pressure in the tyres of a vehicle decreased considerably. Which of the following law explain the above observations?
(a) Gay Lussac's Law
(b) Avogadro Law
(c)   Charle's Law
(d) Boyle's Law

Answer: A

Question. What is the ratio of pressure of the 2gm of hydrogen to that of 4 gm of helium at temperature of 298K, 20ml volume? (consider the ideal behaviour)
(a) 1 : 1
(b) 1 : 2
(c) 2 : 1
(d) 2 : 2

Answer: A