Formalin is a 40 per cent solution of:

methanal

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methanol

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methanoic acid

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none of these

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Solution

The correct option is A methanal
A saturated water solution of about 40% formaldehyde by volume or 37% by mass is called "100% formalin".
A typical commercial grade formalin may contain 10-12% methanol in addition to various metallic impurities.

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