States of Matter

If a gas expands at constant temperature, it indicates that

1. kinetic energy of molecules remains the same
2. number of the molecules of gas increases
3. kinetic energy of molecules decreases
4. pressure of the gas increases

The surface tension of which of the following liquids is maximum ?

1. C2H5OH
2. CH3OH
3. H2O
4. C6H6

Van der Waals real gas acts as an ideal gas at which conditions?

1. High temperature, low pressure
2. Low temperature, high pressure
3. High temperature, high pressure
4. Low temperature, low pressure

The beans are cooked earlier in pressure cooker because

1. boiling point increases with increasing pressure
2. boiling point decreases with increasing pressure
3. extra pressure of pressure cooker softens the beans
4. internal energy is not lost while cooking in pressure cooker

Which of the following expressions correctly represents the relationship between the average molar kinetic energy, KE, of CO and N2 molecules at the same temperature?

1. KECO = KEN2
2. KECO > KEN2
3. KECO < KEN2
4. cannot be predicted unless volumes of the gases are given