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Milk can be preserved by adding a few drops of

(a) Formic acid solution
(b) Formaldehyde solution
(c) Acetic acid solution
(d) Acetaldehyde solution

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Answer: Formaldehyde solution
Formaldehyde kills the micro-organisms which spoils the milk by producing lactic acid which coagulate the milk.
answered Mar 16, 2014 by mosymeow_1
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