Boiling

Q.

The vapour pressure of water at 300 K in a closed container is 0.4 atm. If the volume of container is doubled, its vapour pressure at 300 K will be:

1. 0.2 atm

2. 0.8 atm

3. 0.6 atm

4. 0.4 atm

Q.

Two liquids A and B have boiling points of $350K$ and $375K$ respectively. Which of the two has the greater intermolecular force of attraction?

Q. If saturated vapours are compressed slowly at cons†an t temperature to one fourth the initial volume, the vapour pressure will

Q.

Liquid X has a stronger intermolecular force than liquid Y. Will it boil at a lower or higher temperature than Y?

Q. 16 At 1.23atm &727^° C total equilibrium pressure partially dissociate in SO3, SO2 and O2 SO3(g) >SO2(g)+1/2O2(g) If the density of equilibrium mixture is 0.9gm/lit so what is the dissociation value 1)1/3 2)2/3 3)1/4 4)1/5

Q.

Supercooled liquids and Bose-Einstein condensates are the same.

1. True

2. False

Q. Boiling point of a liquid does not depend upon its intermolecular forces of attraction.

1. True
2. False

Q. What is the relation between pressure, volume and work.

Q. in 3l container, 3.094g of o2 is collected over water.Pressure of moist water at 27 degree celcius\lbrack vapour pressure of water is 27mm at 27 degree celcius and volume of water is negligable\rbrack

Q. What is the entropy of super cooled liquids at zero Kelvin

Q.

The vapour pressure of water at 300 K in a closed container is 0.82 atm. If the volume of container is doubled, its vapour pressure at 300 K will be

1. 2.43 atm

2. 56.3 atm

3. 0.82 atm

4. 8.45 atm

Q. N2O4 AT 2 ATM IS INTRODUCED IN A 12L RIGID VESSEL AT 300 K .TEMP. IS INCRESED TO 600K DUE TO WHICH 50% OF N2O4 DISSOCIATE INTO NO2.CALCULATE FINAL PRESSURE OF SYSTEM

Q. The distillation technique most suited for separating glycerol from spent-lye in the soap industry is:

1. Fractional distillation
2. Steam distillation
3. Distillation under reduced pressure
4. Simple distillation

Q. A gas cylinder can withstand pressure of 20 atm. At 27°C gas has pressure of 15 atm. If temperature of room start rising due to sudden fire. Minimum temperature at which cylinder will explode is Options: 375°C 127°C 300°C 210°C

Q.

Which of the following is TRUE for alkanes?

1. (a)Boiling point increases with increase in carbon content

2. (a)Melting point increases with increase in carbon content.

3. (a)The densities increase with increase in molecular masses.

4. (a)Alkanes are less reactive than alkenes and alkynes

Q. Why in the definition of enthalpy of fusion the melting of one mole of solid substance is at STANDARD STATE and in molar enthalpy of vaporization and enthalpy of sublimation it is written that it is at constant temperature and under STANDARD PRESSURE so what is there a difference in definitions

Q. how many electrons are present in 1.6 gram of methane ch4 ?

Q.

vapour pressure of water , acetone, ethanol at 293K are 2.34 , 12.36 and 5.85 kPa respectively. which of these have the lowest and highest boiling point?

Q. which conditions will increase the boiling point of water at cons†an ttemperature and pressure?

Q. why the process of boiling is not possible in closed container?

Q.

The normal boiling point of a liquid is that temperature at which vapour pressure of the liquid is equal to:

1. Zero

2. 380 mm of Hg

3. 760 mm of Hg

4. 100 mm of Hg

Q. Water boils in a closed container.

1. True
2. False

Q. why is rate of evaporation in a closed vessel constant at a certain temperature while rate of condensation is not?

Q. does equilibrium of ice water occur only at 0 degree celcius and 1 atm?

Q. L.P.G. cylinder can withstand a pressure of 14.9 atmosphere. The pressure gauge of the cylinder indicates 12 atmosphere at 27°C. Due to a sudden fire in the building the temperature rises. At what temperature will the cylinder explode.

Q. Barring Helium, the melting and boiling points of every noble gas lie within a range of 10 degrees Celsius – True or false?

1. True
2. False