When water boils, its temperature :
remains constant
first decreases then increases
keeps on increasing as long as heating is continued
may decrease or increase depending, on the place where the experiment is being carried out.
CNG stands for
Compressed natural gas
Compound natural gas
Compressed neo gas
Combined Natural gas
When we put some crystals of potassium permanganate in a beaker containing water, we observe that after sometime whole water has turned pink. This is due to
boling
melting of potassium permanganate crystals
sublimation of crystals
diffusion
The amount of heat energy that is required to change 1kg of a solid into liquid at atmospheric pressure at its melting point is known as
Fusion point
Latent heat of fusion
Condensation
Evaporation
Which of the following statements about the liquid state is incorrect?
Liquids cannot be compressed.
Liquids have the maximum fluidity
Liquids have a definite volume but take the shape of the vessel in which it is kept
Liquids have weak interparticle forces in comparison to solids
A solid can be converted into gas by
Heating
Melting
Sublimation
Matter around us exist in different states.They are
One
Two
Three
Four
Which of these choices will not change the state of matter?
Temperature
Crushing a crystal
Pressure
Heat
The force of attraction between the particles is greater in
Oxygen
Liquid state
Solid state
Gaseous state
In the determination of boiling point of water, it is advised to put the bulb of the thermometer in the steam rather than in water, it is to :
reduce the error due to atmospheric pressure.
make sure that boiling point obtained is accurate even when water sample contains non - volatile impurities dissolved.
reduce the error due to expansion of glass because of heat.
obtain the boiling point in a shorter time.
