Freezing

Q. Jasmine noted down the temperature of each day and the state of cocunut oil. What can be the approximate freezing point and melting point of the coconut oil?
$$\begin{array}{cc}\text{Temperature}{(}^0\text{C})& \text{State}\\ \text{26.5}& \text{Liquid}\\ \text{26}& \text{Liquid}\\ \text{24.5}& \text{Liquid}\\ \text{24}& \text{Solid}\\ \text{23}& \text{Solid}\\ \text{22.6}& \text{Solid}\end{array}$$

1. Freezing point = 23 ${}^o$C
   Melting point = 24.5 ${}^o$C
2. Freezing point = 24 ${}^o$C
   Melting point = 24 ${}^o$C
3. Freezing point = 24 ${}^o$C
   Melting point = 26 ${}^o$C
4. Freezing point = 22.6 ${}^o$C
   Melting point = 24 ${}^o$C

Q. Identify the processes A and B:

$\text{Ice}\stackrel{\text{A}}{\to }\text{Water}\stackrel{\text{B}}{\to }\text{Water vapour}$

1. A- heating
   B- cooling
2. A- cooling
   B- heating
3. A- cooling
   B- cooling
4. A- heating
   B- heating

Q. A vapour on cooling changes into ______ and on further cooling it changes into solid.

1. gas
2. liquid
3. solid
4. none of these

Q. At the freezing point, particles slow down, come close and get converted into a _______.

1. liquid
2. solid
3. gas
4. vapor

Q. What is the change of a substance from solid to liquid called

Q.

The phase transition in which a liquid turns into a solid is called as _______

1. freezing

2. melting

3. sublimation

4. evaporation