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
ants are attracted by the odour of this acid
this acid was first obtained by the distillation of ants
this acid, in ancient times, was used to eliminate ant-hills

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Chemistry
The BOD values of water indicate the

Amount of organic debris
Amount of ozone used for biochemical oxidation
Amount of oxygen used for biochemical oxidation
Amount of oxygen used for biochemical reduction

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