Question

2.
Which one of the following is not an example of a pure substance?
oxygen
air
copper
carbon dioxide
3.
The process of loading helps to-
slow down the rate of sedimentation
speed up the rate of sedimentation
speed up the rate of decantation
slow down the rate of decantation
4. Transferring the clear liquid, into another container, leaving behind the residue,
is called
sedimentation
decantation
condensation
crystallisation
5.
A substance, that sublimes easily, is-
naphthalene
salt
sugar
chalk​

Answer 1

Answer:

2 . air

3 . speed up the rate of decantation

4 . decantation

5 .chalk

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