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Which of the following is bentonite?

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in Casting-Forming-Welding I by (687k points)
Which of the following is bentonite?

(a) Kaolinite

(b) Sodium Montmorillonite

(c) Illite

(d) Limonite

I got this question by my college director while I was bunking the class.

My question comes from Molding Sands Binders in section Molding and Core Sands of Casting-Forming-Welding I

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Best answer
The correct choice is (b) Sodium Montmorillonite

The explanation is: Bentonite sands are one of the most useful additive in casting sands, as it helps in enhancing its properties. Bentonite is classified into 2 types, namely, Sodium montmorillonite and Calcium montmorillonite.

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