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_____________ increases SiO2-Na2O ratio that increases the bond.

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_____________ increases SiO2-Na2O ratio that increases the bond.

(a) Sulphuric acid

(b) Acetic acid

(c) Carbonic acid

(d) Hydrochloric acid

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This intriguing question originated from Carbon Dioxide Mould in portion Moulding Machines & Special Moulding Processes of Foundry and Forging

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The correct option is (c) Carbonic acid

Explanation: Passage of carbon-dioxide through the sand containing sodium silicate produces carbonic acid in the aqueous solution. This causes a rise in the SiO2-Na2O ratio and formation of a colloidal silica gel, which hardens and forms the bond between sand grains.

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