States of Matter: Gases and liquids Test

Result

States of Matter: Gases and liquids Test - 1

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Weekly Quiz Competition

Question 1
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Separation of a mixture of gases on the basis of the difference in their rates of diffusion is called

A
hydrolysis

B
atmolysis

C
electrolysis

D
osmosis

Solution

Separation of a mixture of gases on the basis of the difference in their rates of diffusion is called atmolysis.
This is done by allowing the mixture to diffuse through a porous substance and the gas with a faster rate of diffusion will diffuse out first.
Question 2
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Which gas has the same rate of diffusion as that of CO₂ at the same temperature and pressure?

A
N₂O

B
NO₂

C
CO

D
N₂

Solution

Both N₂O and CO₂ have the same rate of diffusion because both have the same molecular weight.
Question 3
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Which of the following options represents Avogadro's number?

A
The number of molecules present in 1 L of gas at NTP

B
The number of molecules present in 22.4 mL of gas at NTP

C
The number of molecules present in 22.4 L of gas at 298 K and 1 atm pressure

D
The number of molecules present in one mole of gas at any temperature and pressure

Solution

Avogadro's number is the number of molecules present in one mole of gas at any temperature and pressure.
Question 4
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A mixture of N₂ and O₂ in the ratio 4 : 1 by volume is heated in an open mouthed flask from 27^oC to 127^oC. Which of the following statements is/are true?

A
Mole fraction of nitrogen in the final mixture in the flask at 127^oC is 0.8.

B
Fraction of the original mixture that remains in the flask is 1.75.

C
Molar ratio of nitrogen and oxygen becomes 3 : 1.

D
All of the above

Solution

Since the molar ratio is the same as the volume ratio, mole fraction of nitrogen is 4/(4 + 1) = 0.8.