Q11.
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?
Answer
A
Explanation
high-temperature process for manufacturing the all-important glue that binds the of concrete, accounts for roughly 8% of the anthropogenic carbon dioxide emissions and 2–3% of the global energy supply, according the International Energy Agency. method calls for heating powdered limestone, a available, inexpensive material, and clay to 1,450 °C in a kiln. The high-temperature known as calcination (clinker production), calcium carbonate (CaCO3), the principal of limestone, to calcium oxide (CaO), or releasing CO2. That simple reaction, which is key making cement, is the source of about half the CO2 in cement manufacturing. mixing silica-based clay with limestone during production leads to the release of CO2. This because there is use of energy for this process it releases CO2 gas. Hence, Both Statement II and III are correct and both of them explain I.