Chemistry
Silver halides are used in photographic plates because they are

Totally colourless
Reduced by light
Soluble in hyposolution
Oxidised in air

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

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
this corrosive acid is secreted by ants to drive away their enemies

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