Pick out the liquid-in-gas type of mixture from the following.
Dissolved carbon dioxide in water
Droplets of water in air
Oxygen dissolved in water
All of the above
Identify the compound from the following.
Carbon dioxide
Iron
Hydrogen
Air
In a mixture , constituents exhibit :
similar properties
only those properties which are characteristic to the mixture
their own properties
no properties
Which of the following mixtures will be the most difficult do separate ?
Iron fillings + sand
Sand + water
Saw dust + stones
Nitrogen + hydrogen
A coagulant is :
special chemical which helps small fine particles to settle down
which helps the substance to sublime
filtering agent
none of the above
Pure substances possess :
variable melting points and boiling points
nonuniform composition
variable properties
fixed melting points and boiling points
Wheat flour is separated from wheat bran by the method of :
handpicking
sieving
winnowing
filtration
The heterogeneous mixture of soot particles in air is a mixture of :
solid-in-solid
solid-in-gas
gas-in-solid
gas-in-gas
Alloys are the examples of mixtures of :
The process by which a solid changes directly into gas is called :
decantation
sublimation
condensation
sedimentation
