A substance which cannot sublime is:

1. iodine
2. camphor
3. sugar
4. dry ice

When you put some ice cubes in a glass droplets of water are formed on the outer wall of the glass. This explains the phenomenon of:

1. melting
2. freezing
3. condensation
4. evaporation

Which one of the following is volatile in nature?

1. common salt
2. petrol
3. water
4. milk

An example of both physical and chemical change is:

1. burning of candle
2. melting of ice
3. cooking of food
4. glowing of bulb