A small boy mischievously mixed small pebbles into a bag of pulses. What method will you employ to separate the mixture ?
Magnetic separation
Crystallisation
Handpicking
Filtration
Identify the compound from the following.
Carbon dioxide
Iron
Hydrogen
Air
A pure substance is made up of :
only one kind of molecules
two or more kinds of molecules
different types of molecules
none of the above
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
A coagulant is :
special chemical which helps small fine particles to settle down
which helps the substance to sublime
filtering agent
Sieving can be used only when the components of the mixture have :
different sizes
different melting points
different boiling points
different specific gravities
In a mixture , constituents exhibit :
similar properties
only those properties which are characteristic to the mixture
their own properties
no properties
The process by which a solid changes directly into gas is called :
decantation
sublimation
condensation
sedimentation
Sand and water can be separated by :
sieving
magnetic separation
Wheat flour is separated from wheat bran by the method of :
handpicking
winnowing
filtration
