Class 11 Chemistry Chapter 5 States of Matter Questions and Answers
Questions
1
Which of the following changes decrease the vapour pressure of water kept in a sealed vessel?
Answer:B, D
2
Under which of the following two conditions applied together, a gas deviates most from the ideal behaviour?
Answer:B, C
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3
Which of the following figures does not represent 1 mole of dioxygen gas at STP?
Answer:A, D
4
With regard to the gaseous state of matter which of the following statements are correct?
Answer:B, C
5
How does the surface tension of a liquid vary with an increase in temperature?
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?
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.
Answer:Shimla
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
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?
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?
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
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
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?
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:
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℃
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.
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℃
Answer:620℃
19
At the same temperature, the average molar kinetic energy of N2 and CO is
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
Answer:36 u
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