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In order to develop hydraulicity, it is necessary to have _________ and _________ present in chemical combination with the limestone.

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In order to develop hydraulicity, it is necessary to have _________ and _________ present in chemical combination with the limestone.

(a) Alumina and carbon

(b) Magnesium and carbon

(c) Silica and carbon

(d) Alumina and silica

I had been asked this question in a national level competition.

My question comes from Lime topic in chapter Glass, Lime, Clay Products & Bricks of Construction & Building Materials

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Right option is (d) Alumina and silica

Explanation: In order to develop hydraulicity, it is necessary to have alumina and silica present in chemical combination with the limestone. Silicates of magnesium, aluminium and calcium are responsible for hydraulicity.

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