Decantation is a :
process of transferring the clear liquid without disturbing the sediments
process of separating an insoluble solid from a liquid using filter paper
process of settling down heavier , insoluble particles from a mixture
process by which a solid changes directly into the vapour state
Mixtures in which components can be distingushed are called :
heterogeneous
homogenous
pure substances
solutions
Identify the compound from the following.
Carbon dioxide
Iron
Hydrogen
Air
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
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
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
Winnowing is useful only when :
two solids have different melting points
two solids have different boiling points
two solids have different magnetic properties
two solids have different weights
Sand and water can be separated by :
decantation
sieving
sublimation
magnetic separation
Alloys are the examples of mixtures of :
solid-in-gas
gas-in-solid
gas-in-gas
solid-in-solid
Pure substances possess :
variable melting points and boiling points
nonuniform composition
variable properties
fixed melting points and boiling points
