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Which of the following is a perfect composition of clay (Bentonite) used in moulding sand?

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in Casting-Forming-Welding I by (687k points)
Which of the following is a perfect composition of clay (Bentonite) used in moulding sand?

(a) Al2O3

(b) Al2O3.2SiO2

(c) Al2O3.2H2O

(d) Al2O3.2SiO2.2H2O

I had been asked this question in an interview for job.

Asked question is from Mold Materials topic in section Molding and Core Sands of Casting-Forming-Welding I

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Correct choice is (d) Al2O3.2SiO2.2H2O

For explanation: Bentonite is one type of clay used in moulding sand as a binder. Its chemical formula is represented as Al2O3.2SiO2.2H2O.

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