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What is the percentage composition of quartz in Western bentonite?

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What is the percentage composition of quartz in Western bentonite?

(a) 5%

(b) 10%

(c) 15%

(d) 20%

The question was asked by my school teacher while I was bunking the class.

Question is from Molding Sands Binders topic in division Molding and Core Sands of Casting-Forming-Welding I

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Correct choice is (b) 10%

Easiest explanation: Bentonite is classified into 2 types, namely, Sodium montmorillonite and Calcium montmorillonite. Western bentonite also called Sodium montmorillonite is known to have a percentage composition 10% of quartz.

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