Regarding cement industry emissions: Statement I: Cement industry accounts for >5% of global CO2 emissions. Statement II: Silica-bearing clay is mixed with limestone. Statement III: Limestone converts to lime during clinker production. Which is correct?

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Q: 105 (IAS/2025)
Regarding cement industry emissions:
Statement I: Cement industry accounts for >5% of global CO2 emissions.
Statement II: Silica-bearing clay is mixed with limestone.
Statement III: Limestone converts to lime during clinker production.
Which is correct?

question_subject: 

Science

question_exam: 

IAS

Statement I is correct as the cement industry accounts for more than 5% of global CO2 emissions. Statement II is correct as silica-bearing clay is mixed with limestone in cement production. Statement III is correct as limestone converts to lime during clinker production, which is a major source of CO2 emissions. However, only Statement III explains Statement I, as it directly relates to the CO2 emissions from the cement industry.