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The percentage of formaldehyde in formalin is:

1. \( 40 \% \)
2. 30\%
3. \( 20 \% \)
4. 10\%

Correct answer: \( 40 \% \)

Solution

Formalin is the common laboratory solution of formaldehyde, and its standard concentration is about 37–40%. Therefore, the correct option is 40%.

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