Question
Consider the following pairs: I. Pigment TiO _2 II. Drier Turpentine III. Thinner Naphthenates IV. Antiskinning agent Polyhydroxy phenol How many of the pairs given above are correctly matched?
NDA
General Ability
General Science
2026
NDA 2026 (Phase 1)
NDA General Ability Question (2026) — Solution
Options
- A. One
- B. Two
- C. Three
- D. All the four
Answer
B. Two
Step-by-step solution
Pigments provide colour and hiding power to the paint. TiO _2 is a widely used white pigment. Pair I is correctly matched. Driers accelerate the drying of the paint film by catalysing the oxidation of the drying oil. Common driers are naphthenates, resinates, and linoleates of metals like cobalt, manganese, and lead. Pair II is incorrectly matched. Thinners are volatile solvents added to reduce the viscosity of the paint, making it easier to apply. Turpentine is a common thinner. Pair III is incorrectly matched. Antiskinning agents are added to prevent the formation of an insoluble skin on the surface of the paint during storage. Polyhydroxy phenols are commonly used for this purpose. Pair IV is correctly matched. Thus, exactly two pairs (I and IV) are correctly matched. Answer: Two
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