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Which of the following material is used for manufacturing of slag cement ?
1. Chromium sludge
2. Fly ash
3. Ferro alloy
4. Blast furnace slag

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Correct Answer - Option 4 : Blast furnace slag

Explanation: 

Slag Cement: Slag cement is a hydraulic cement formed when granulated blast furnace slag (GGBFS) is ground to suitable fineness and is used to replace a portion of portland cement.

Blast furnace slag: It is a recovered industrial by-product of an iron blast furnace.

Fly ash: Fly ash is a byproduct of burning pulverized coal in electric power generating plants.

Ferro alloy: An alloy of iron with some element other than carbon, used to introduce the element in the manufacture of steel.

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