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___________ are surface active additives.

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___________ are surface active additives.

(a) Oxide inhibitors

(b) Rust inhibitors

(c) Dispersants

(d) Friction modifiers

The question was posed to me during a job interview.

This intriguing question comes from Types of Additives topic in chapter Lubricants of Applied Chemistry

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Right choice is (b) Rust inhibitors

Explanation: The rust inhibitors are the surface active additives. They mainly acts on the surface and makes the metal corrosion free. Mainly from the water corrosion. They form thin film on the surface. It is the oxide film that protects the metal.

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