Final answer:
Flue gases analyses are conducted to determine combustion efficiency and to identify the presence of toxic gases. The correct selection is A) Combustion, Emission. This is integral for environmental monitoring and safety.
Step-by-step explanation:
Flue gases must be analyzed to check combustion efficiency and the presence of toxic gases. The correct answer is A) Combustion, Emission. This is because during the process of combustion, especially when burning fossil fuels, the efficiency of the reaction determines whether the fuel has been burned completely, resulting in desired substances like carbon dioxide and water vapor, or incompletely, leading to the production of toxic gases like carbon monoxide (CO). Combustion analysis is a crucial technique in this aspect, where the gaseous combustion products can be collected and analyzed to determine the efficiency of the burn and to monitor emissions.
Furthermore, this analysis helps in understanding the environmental impact of burning such fuels, as CO is a toxic gas, and CO₂ has been implicated in contributing to global climate change.