Chemistry
The function of sedimentation tank in sewage treatment is to:

Disinfect the sewage
Remove suspended solids
Aerate the sewage
Remove water content

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Chemistry
The Latin word formica means ant. The name formic acid is derived from this Latin word because

this corrosive acid is secreted by ants to drive away their enemies
this acid, in ancient times, was used to eliminate ant-hills
this acid was first obtained by the distillation of ants
ants are attracted by the odour of this acid

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Chemistry
A solution is

A homogeneous mixture of two or more substances
A mixture of two liquids
A solid dissolved i water
A solid dissolved in a liquid

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