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Class 11 Chemistry Chapter 5 States of Matter Questions and Answers

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Free download in PDF Class 11 Chemistry Chapter 5 States of Matter Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER and other competitive exams. MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern. The States of Matter is one of the fundamental concepts of Chemistry. These short solved questions or quizzes are provided by Gkseries./p>

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(1) Which of the following changes decrease the vapour pressure of water kept in a sealed vessel?
[A] Decreasing the quantity of water
[B] Adding salt to the water
[C] Decreasing the volume of the vessel to one-half
[D] Decreasing the temperature of the water
Answer: B, D
(2) Under which of the following two conditions applied together, a gas deviates most from the ideal behaviour?
[A] Low pressure
[B] High pressure
[C] Low temperature
[D] High temperature
Answer: B, C

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(3) Which of the following figures does not represent 1 mole of dioxygen gas at STP?
[A] 16 grams of gas
[B] 22.7 litres of gas
[C] 6.022 × 1023 dioxygen molecules
[D] 11.2 litres of gas
Answer: A, D
(4) With regard to the gaseous state of matter which of the following statements are correct?
[A] Complete order of molecules
[B] Complete disorder of molecules
[C] Random motion of molecules
[D] Fixed position of molecules
Answer: B, C
(5) How does the surface tension of a liquid vary with an increase in temperature?
[A] Remains the same
[B] Decreases
[C] Increases
[D] No regular pattern is followed
Answer: Decreases
(6) Increase in kinetic energy can overcome intermolecular forces of attraction. How will the viscosity of liquid be affected by the increase in temperature?
[A] Increase
[B] No effect
[C] Decrease
[D] No regular pattern will be followed
Answer: Decrease
(7) Atmospheric pressures recorded in different cities are as follows:

Cities Shimla Bangalore Delhi Mumbai

p in N/m2 1.01×105 1.2×105 1.02×105 1.21×105

Consider the above data and mark the place at which liquid will boil first.

[A] Shimla
[B] Bangalore
[C] Delhi
[D] Mumbai
Answer: Shimla
(8) What is the SI unit of viscosity coefficient (η)?
[A] Pascal
[B] Nsm–2
[C] km–2 s
[D] N m–2
Answer: Nsm–2
(9) Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases. Gases H2 He O2 N2 Critical temperature in Kelvin 33.2 5.3 154.3 126 From the above data what would be the order of liquefaction of these gases?

Start writing the order from the gas liquefying first

[A] H2, He, O2, N2
[B] He, O2, H2, N2
[C] N2, O2, He, H2
[D] O2, N2, H2, He
Answer: O2, N2, H2, He
(10) As the temperature increases, the average kinetic energy of molecules increases. What would be the effect of the increase of temperature on pressure provided the volume is constant?
[A] increases
[B] decreases
[C] remains the same
[D] becomes half
Answer: increases
(11) 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] 0.8×105 atm
[B] 0.008 Nm–2
[C] 8×104Nm–2
[D] 0.25 atm
Answer: 8×104Nm–2
(12) Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is
[A] more than unit electronic charge
[B] equal to unit electronic charge
[C] less than unit electronic charge
[D] double the unit electronic charge
Answer: less than unit electronic charge
(13) The interaction energy of the London force is inversely proportional to the sixth power of the distance between two interacting particles but their magnitude depends upon
[A] charge of interacting particles
[B] mass of interacting particles
[C] polarisability of interacting particles
[D] strength of permanent dipoles in the particles.
Answer: polarisability of interacting particles
(14) Which of the following property of water can be used to explain the spherical the shape of rain droplets?
[A] viscosity
[B] surface tension
[C] critical phenomena
[D] pressure
Answer: surface tension
(15) A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude:
[A] pressure increases
[B] temperature decreases
[C] pressure decreases
[D] temperature increases
Answer: pressure decreases
(16) Find the fraction of the total pressure exerted by hydrogen if it is mixed with ethane in an empty container at 25℃
[A] 15/16
[B] 1/16
[C] 1/2
[D] 1
Answer: 15/16
(17) If 1.204 x 1021 molecules of H2SO4 are removed from 392 mg of H2SO4, find the moles of H2SO4 left.
[A] 4 x 10-3
[B] 1.5 x 10-3
[C] 1.2 x 10-3
[D] 2 x 10-3
Answer: 2 x 10-3
(18) Find the temperature at which the rate of effusion of N2 is 1.625 times to that of SO2 at 500℃
[A] 620℃
[B] 173℃
[C] 110℃
[D] 373℃
Answer: 620℃
(19) At the same temperature, the average molar kinetic energy of N2 and CO is
[A] KE1 > KE2
[B] KE1 < KE2
[C] KE1 = KE2
[D] insufficient information given
Answer: KE1 = KE2
(20) Find the molecular mass of a gas that takes three times more time to effuse as compared to He with the same volume
[A] 9 u
[B] 64 u
[C] 27 u
[D] 36 u
Answer: 36 u

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