Which of the following acid is used in Ink?
Correct answer: D. Tannic
- A. Valeric
- B. Acetic
- C. Formic
- D. Tannic
Explanation
Tannic acid is used in traditional ink formulations, especially iron-gall ink, where it reacts with iron salts to produce a dark pigment. Acetic, formic, and valeric acids have different household and industrial uses.
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Chemical principles appear in acids, bases, salts, solutions, oxidation, combustion, corrosion and neutralisation, along with the composition and uses of common substances. Coverage includes soaps and detergents, fertilizers, medicines, food preservatives, polymers, fuels and water treatment, while distinguishing physical changes from chemical reactions.
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