Equal volumes of all gases under similar conditions of temperature and pressure contain equal numbers of molecules. This statement was made by
John Dalton
Berzilius
Avogardo
Gay-Lussac
Which one of the following is not a property of a gas?
Definite volume
Can be compressed
Definite mass
No definite shape
When the temperature of a liquid is increased a little, what happens to its particles?
They stop vibrating.
They move so far apart that the liquid becomes a gas.
They start vibrating more.
They come closer together.
Which among the following can exist in vapour state
oxygen
hydrogen
carbon dioxide
water
Sublimation occurs when
a gas changes into a solid
a solid changes into a liquid
a liquid changes into a gas
a solid changes into a gas
The diagram shows the changes in state of water (H2O). What is the process W called?
Condensation
Melting
Freezing
Boiling
When two gases mix together, they are said to
evaporate
condense
diffuse
melt
