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Which of the following compound forms the bond between sand particles in carbon dioxide moulding process.

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in Casting-Forming-Welding I by (687k points)
Which of the following compound forms the bond between sand particles in carbon dioxide moulding process.

(a) Sodium

(b) Amorphous silica

(c) Dehydrated water

(d) Carbon Monoxide

The question was posed to me by my college professor while I was bunking the class.

My question comes from Molding Processes topic in portion Mold and Mold Making of Casting-Forming-Welding I

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Correct choice is (b) Amorphous silica

Explanation: Amorphous silica forms the bond between sand particles. It is produced by reaction or treatment of the mixture of sand and sodium silicates by carbon dioxide.

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