States of Matter
Question
Question 1 : The vapour pressure of water at 300 K in a closed container is 0.4 atm. If the volume of container is doubled, its vapour pressure at 300 K will be
1. 0.2 atm
2. 0.4 atm
3. 0.6 atm
4. 0.8 atm
Answer
Correct Anaswer : 2
Explanation:
Vapour pressure depends on T only and it does not depend on container volume.
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Question 2 : Name the liquid with higher vapour pressure in the following pairs:
(a) Alcohol, glycerin (b) Petrol, kerosene (c) mercury, water.
1. Alcohol, Petrol, Water
2. Petrol, Water, Alcohol
3. Alcohol, Water, Petrol
4. None of these
Answer
Correct Anaswer : 1
Explanation:
The vapour pressure of the liquid is inversely proportional to the magnitude of the intermolecular forces of attraction present. Based on this, the liquid with higher vapour pressure in the different pairs is: (a) Alcohol, (b) Petrol, (c) Water.
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Question 3 : The rate of diffusion methane is twice that of X. The molecular mass of X is
1. 64.0
2. 32.0
3. 40
4. 80
Answer
Correct Anaswer : 1
Explanation:
64.0
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Question 4 : The state of matter that shows the uniformity of behavior :
1. Gas
2. Liquid
3. Solid Liquid
4. None of the Above
Answer
Correct Anaswer : 1
Explanation:
Of the three states of matter, the gaseous state is the simplest and shows greatest uniformity in behaviour. Gases show almost similar behaviour irrespective of their chemical nature. This state is characterized by:
Gases maintain neither the volume nor the shape. They completely fill the container in which they are placed.
They expand appreciably on heating. Gases are highly compressible. The volume of the gas decreases when the pressure increases. They diffuse rapidly into space. Gases exert equal pressure in all directions.
All gases are colourless except a few e.g. chlorine (greenish yellow) bromine (reddish brown), nitrogen dioxide (reddish brown)
The behaviour of gases can be described by certain quantitative relationships called gas laws. They give the relationship between mass, pressure, volume and temperature.
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Question 5 : A gas deviates from ideal behavior at a high pressure because its molecules:
1. Attract one another
2. Show the Tyndall Effect
3. Have kinetic energy
4. Are bound by covalent bonds
Answer
Correct Anaswer : 1
Explanation:
The basic concept of the kinetic-molecular theory give us the information why real gases deviate from ideal behavior. The molecules of an ideal gas are assumed to occupy no space and have no attractions for one another. Real molecules, however, do have finite volumes, and they do attract one another. So, a gas deviates from ideal behavior at a high pressure because its molecules attract one another.
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