Chemistry
Which one of the following organic compound is used to remove stains of iron compounds?

Benzoic acid
Oxalic acid
Cinnamic acid
Phthalic acid

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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
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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