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Common bitumen is generally of which nature?

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Common bitumen is generally of which nature?

(a) Anionic

(b) Cationic

(c) Neutral charge

(d) No charge

The question was posed to me in a job interview.

I want to ask this question from Rocks as Materials for Construction topic in division Engineering Properties of Rocks of Engineering Geology

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The correct option is (a) Anionic

Easy explanation: Common bitumen is generally anionic in character. Any aggregate having electrolytic property will behave as hydrophobic or water repelling and vice-versa. This holds well in aggregates.

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