Two thermally insulated vessels 1 and 2 are filled with air at temperatures volume and pressure respectively. If the valve joining the two vessels is opened, the temperature inside the vessel at equilibrium will be
1.
2.
3.
4.
For matter to exist simultaneously in gas and liquid phases :
1. The temperature must be 0 K.
2. The temperature must be less than .
3. The temperature must be less than the critical temperature.
4. The temperature must be less than the reduced temperature.
The value of critical temperature in terms of Vander Waal’s constant a and b is
1.
2.
3.
4.
In Vander Waal’s equation, a and b represent
1. Both a and b represent correction in volume
2. Both a and b represent adhesive force between molecules
3. a represents adhesive force between molecules and b correction in volume
4. a represents correction in volume and b represents adhesive force between molecules
At 0°C the density of a fixed mass of a gas divided by pressure is x. At 100°C, the ratio will be:
1.
2.
3.
4.
At what temperature volume of an ideal gas at 0°C becomes triple keeping the pressure constant :
1. 546°C
2. 182°C
3. 819°C
4. 646°C
If an ideal gas has volume V at 27°C and it is heated at a constant pressure so that its volume becomes 1.5V. Then the value of final temperature will be
1. 600°C
2. 177°C
3. 817°C
4. None of these
A tyre kept outside in sunlight bursts off after sometime because of :
1. Increase in pressure
2. Increases in volume
3. Both (a) and (b)
4. None of these
The figure shows two flasks connected to each other. The volume of the flask 1 is twice that of flask 2. The system is filled with an ideal gas at temperature 100 K and 200 K respectively. If the mass of the gas in flask 1 be m, then what is the mass of the gas in flask 2?
1.
2.
3.
4.