railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Chemistry Equilibrium

Which of the following statements is INCORRECT about vinegar?

1
Vinegar is a combination of acetic acid and water.
2
It can be used as a food preservative.
3
It is a combination of acetic acid and formic acid.
4
It is produced by 2-step fermentation.
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