Formalin is the commercial name of :

formic acid

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fluoroform

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40

% aqueous solution of methanal

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paraformaldehyde

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Solution

The correct option is B $40$ % aqueous solution of methanal
A saturated water solution, of about 40% formaldehyde by volume or 37% by mass, is called formalin.

Hence, the correct option is $C$

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