Give a reason why gas exerts pressure on the walls of the container.

Classify the following processes into osmosis or diffusion:
$(a)$ Swelling up of a raisin on keeping in water.
$(b)$ Spreading of virus on sneezing.
$(c)$ Earthworm dying on coming in contact with common salt.
$(d)$ Shrinking of grapes kept in thick sugar syrup.
$(e)$ Preserving pickles in salt.
$(f)$ Spreading of smell of cake being baked throughout the house.
$(g)$ Aquatic animals using oxygen dissolved in water during respiration.

When suffering from a fever,which will lower your body temperature more effectively: ice or ice-cold water? Why?

How can the interconversion of states of matter be achieved?

Define the melting point of a solid. At what temperature in the Kelvin scale does ice melt? In the experiment to determine the melting point of ice,why does the temperature not rise until all the ice melts,even though heat is continuously supplied? What is this heat energy called?

Which condition out of the following will increase the evaporation of water?