The evaporation of a formalin solution leaves a white solid called:

paraformadehyde

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ketone

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aldehyde

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none of the above

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Solution

The correct option is A paraformadehyde
Commercial solution of formaldehyde in water is called as formalin and was used as disinfectant but it is highly toxic and volatile. Paraformaldehyde is one of the polymer of formaldehyde and has same chemical properties formed when formalin is evaporated.

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