M

Mr. Dubey • 52.30K Points
Coach 

Q. Which of the following additives are added to the sand in Co2 moulding for the improvement in collapsibility of the sand?

(A) copper oxide
(B) wood flour
(C) aluminium oxide
(D) oil
Correct : Option (C)

Explanation: 
 after the preparation of the sand mixture by adding sodium silicate to the

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