The beans are cooked 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
The compressibility factor for H2 and He is usually:
1. >1
2. =1
3. <1
4. either of these
Boyle's law is applicable in :
1. Isobaric process
2. Isochoric process
3. Isothermal process
4. Adiabatic process
The correct value of the gas constant 'R' is close to
1. 0.082 L atm K
2. 0.082 L atm K-1 mol-1
3. 0.082 L atm-1 K mol-1
4. 0.082 L-1 atm-1 K mol
The number of molecules present in 1 mL of gas or vapor at STP is:
1. called Loschmidt's number
2. equal to 2.617 x 1019 per mL
3. both (1) and (2)
4. none of the above
600 cc of a gas at a pressure of 750 mm is compressed to 500 cc. Taking the temperature to remain constant, the increase in pressure is:
1. 150 mm
2. 250 mm
3. 350 mm
4. 450 mm
An ideal gas expands according to PV=constant. On expansion, the temperature of the gas:
1. Will rise.
2. Will drop.
3. Will remain constant.
4. Cannot be determined because the external pressure is not known.
The correct statement for an ideal gas equation is -
1. n is the number of molecules of a gas.
2. V denotes the volume of 1 mole of the gas.
3. n moles of a gas has a volume V.
4. p is the pressure of the gas when only one mole of the gas is present.
The ratio among most probable velocity, mean velocity, and root mean square velocity is given by
1. 1:2:3
2. 1:
3.
4.
The compressibility of a gas is less than unity at STP. Therefore:
1. Vm > 22.4 litre
2. Vm < 22.4 litre
3. Vm = 22.4 litre
4. Vm = 44.8 litre