which substance is used in lotions and cosmetics?\no ammonium hydroxide\no acetic acid\no formic acid\no…

Answer:

None of the above options are commonly used in lotions and cosmetics in a major way. However, if we had to choose from the given options, none of them are typical main - ingredients. But acetic acid can be used in some cosmetic formulations in very small amounts as a pH adjuster. So, if forced to choose, it would be acetic acid.

Brief Explanations:

Ammonium hydroxide is a strong base and not a common cosmetic ingredient. Formic acid is a strong and corrosive acid, not suitable for cosmetics. Zinc hydroxide is not a typical cosmetic ingredient either. Acetic acid can be used in small amounts to adjust the pH of cosmetic products.