Q.1. At 400 K, the root mean square (rms) speed of a gas X (molecular weight = 40) is equal to the most probable speed of gas Y at 60 K. The molecular weight of the gas Y is (2009)
Ans. 4
Sol.
Given vrms = vmp
⇒ My
Q.2. To an evacuated vessel with movable piston under external pressure of 1 atm, 0.1 mol of He and 1.0 mol of an unknown compound (vapour pressure 0.68 atm. at 0°C) are introduced.
Considering the ideal gas behaviour, the total volume (in litre) of the gases at 0°C is close to (2011)
Ans. 7
Sol. PHe = 1 – 0.68 = 0.32 atm, n = 0.1
= 7
Q. 3. The diffusion coefficient of an ideal gas is proportional to its mean free path and mean speed. The absolute temperature of an ideal gas is increased 4 times and its pressure is increased 2 times. As a result, the diffusion coefficient of this gas increases x times. The value of x is (JEE Adv. 2016)
Ans. 4
Sol. Diffusion coefficient ∝ λ µ
Since
∴ Diffusion coefficient
Thus
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1. What are the three states of matter? |
2. What is the difference between a solid and a liquid? |
3. How does a substance change from a solid to a liquid? |
4. What causes a substance to change from a liquid to a gas? |
5. How does pressure affect the states of matter? |
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