Consider the following statements :
Statement I: Studies indicate that carbon dioxide emissions from cement in

Question

Consider the following statements :
Statement I: Studies indicate that carbon dioxide emissions from cement industry account for more than 5% of global carbon emissions.
Statement II: Silica-bearing clay is mixed with limestone while manufacturing cement.
Statement III : Limestone is converted into lime during clinker production for cement manufacturing.
Which one of the following is correct in respect of the above statements?

Accepted Answer

Statement I is correct. Studies indicate that cement industry CO2 emissions account for approximately 7-8% of global carbon emissions, which is more than 5%.

Statement II is correct. Silica-bearing clay is indeed mixed with limestone as raw materials in cement manufacturing.

Statement III is correct. Limestone (calcium carbonate, CaCO3) is converted into lime (calcium oxide, CaO) during clinker production through calcination, releasing CO2 in the process.

Both Statements II and III are factually correct. However, only Statement III explains Statement I. The calcination of limestone (CaCO3 → CaO + CO2) directly releases CO2, accounting for about 60% of total cement industry emissions. Statement II merely describes the raw materials used and does not explain why cement production causes high carbon emissions.

Answer

Both Statement II and Statement III are correct and both of them explain Statement I

Answer

Both Statement II and Statement III are correct but only one of them explains Statement I

Answer

Only one of the Statements II and III is correct and that explains Statement I

Answer

Neither Statement II nor Statement III is correct

Explanation

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