Boiling

Q.

Liquid a has higher vapour pressure than liquid b. Which liquid out of a and b will have lower boiling point.

Q. If boiling point of some oil is $300{}^0$C, then what will be the boiling point of the oil on Kelvin scale?

1. 100 K
2. 373 K
3. 573 K
4. 273 K

Q. Which of the following factor reduces the rate of evaporation?

1. Humidity
2. Surface area
3. Temperature
4. Wind speed

Q. During the process of fusion, the kinetic energy of the particles _______________.

A) decreases
B) increases
C) remains same

Q. Three containers each having a volume of 1 m${}^3$ contain 1 m${}^3$ of substance X, Y and Z. X is a solid, Y is a liquid and Z is a gas. X, Y and Z are then carefully transferred without spillage to another three containers having a volume of is 5 m${}^3$ each. The new volumes of X, Y and Z will be:

1. X = Y= Z = 5 m${}^3$
2. X = 5 m${}^3$, Y = Z = 1 m${}^3$
3. X = Y= Z = 1 m${}^3$
4. X = Y = 1 m${}^3$, Z = 5 m${}^3$

Q. Evaporation is a phenomenon that occurs:

1. only at boiling point
2. below boiling point
3. only above boiling point
4. at melting point

Q. The process of conversion of gas into liquid on cooling is called as:

1. evaporation
2. condensation
3. diffusion
4. sublimation

Q. Some amount of common salt is dissolved in a beaker full of water. How does this affect the boiling point of water?

Q. Steam results in more severe burns than boiling water.

1. True
2. False

Q. At higher altitude:

1. Boiling point of liquid increases
2. Boiling point of liquid decreases
3. Boiling point of liquid remains unaffected
4. Melting point of solid increases

Q.

1. True
2. False

Q. What are the factors affecting evaporation?

Q. Differentiate between evaporation and boiling. [3 MARKS]

Q. Which of the given graph correctly depicts the relation between pressure at a place and boiling point of water?​

Q.

Which of the given options correctly depicts the relationship between the boiling point of tap water and distilled water?

1. ${(B.P)}_{\mathrm{tap}}>{(B.P)}_{\mathrm{distilled}}$

2. ${(B.P)}_{\mathrm{distilled}}>{(B.P)}_{\mathrm{tap}}$

3. ${(B.P)}_{\mathrm{tap}}={(B.P)}_{\mathrm{distilled}}$

Q.

What happens when you pour some acetone on your palm?

1. The particles lose energy and evaporate, causing the palm to feel cool.

2. The particles gain energy from the palms and evaporate, causing the palm to feel cool.

3. The particles lose energy from the palms and condensate causing the palm to feel hot.

4. The particles gain energy from the palms and evaporate, causing the palm to feel hot.

Q. It is known that boiling takes place at a constant temperature, whereas evaporation takes place at all temperatures. So can we say that during the process of boiling, evaporation takes place? Explain why as well.