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NDA 2 2024 GAT, question 62

Topic: Chemistry

Q62

Which one among the following is commonly used as an ‘anti-skinning agent’ in paints ?

  1. (a) Gelatin
  2. (b) N-methyl pyrrolidone
  3. (c) Pyridine
  4. (d) Polyhydroxy phenolCorrect answer

Solution.

Answer: (d) Polyhydroxy phenol

  1. A skin forms when oxidation causes the exposed surface of a drying paint to polymerise.
  2. Polyhydroxy phenols act as antioxidants and can retard this process, making them anti-skinning agents.
  3. The other choices do not supply the standard antioxidant class asked for.