1.

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

A. Al<sub>2</sub>O<sub>3</sub>
B. Al<sub>2</sub>O<sub>3</sub>.2SiO<sub>2</sub>
C. Al<sub>2</sub>O<sub>3</sub>.2H<sub>2</sub>O
D. Al<sub>2</sub>O<sub>3</sub>.2SiO<sub>2</sub>.2H<sub>2</sub>O
Answer» E.


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