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

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

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Chemistry
What are the components responsible for acid rain?

Sulphur dioxide (SO2) and Nitrogen oxides (NOx)
Nitrogen monoxide (NO) and Carbon monoxide (CO)
Oxides of carbon (COx) and Oxides of nitrogen (NOx)
Carbon dioxide (CO2) and Carbon monoxide (CO)

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