Statement I: Studies indicate that carbon dioxide emissions from cement industry account for more than 5% of…
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?
Both Statement II and Statement III are correct and both of them explain Statement I
Both Statement II and Statement III are correct but only one of them explains Statement I
Only one of the Statements II and III is correct and that explains Statement I
Neither Statement II nor Statement III is correct
Solution
Cement industry emits ~7-8% of global CO2 (I correct). II and III are both correct, but only the calcination step (III, limestone → lime + CO2) directly explains the high emissions; II describes raw mix but not CO2 release. [Sources disagree: Insights IAS — B; Prepp — C. Flagged as provisional.]