ANS:A - carbon dioxide from gaseous stream using alkaline solution.

'Absorption with chemical reaction' is involved in the removal of carbon dioxide from a gaseous stream using alkaline solution. In this process, carbon dioxide (CO2) from the gaseous stream reacts with an alkaline solution, typically an aqueous solution of sodium hydroxide (NaOH) or potassium hydroxide (KOH), to form a soluble carbonate or bicarbonate compound. The chemical reaction involved is typically: CO2+2OH−→CO32−+H2OCO2​+2OH−→CO32−​+H2​O This reaction allows for the removal of carbon dioxide from the gaseous stream by converting it into a soluble form in the alkaline solution. The absorption process involves both physical absorption (dissolution of CO2 into the liquid phase) and chemical reaction (formation of carbonate or bicarbonate compounds). The other options listed involve physical absorption processes without significant chemical reactions:

• Benzol from coke oven gas using solar oil/wash oil: This typically involves physical absorption of benzene (benzol) from coke oven gas into a hydrocarbon-based solvent, such as solar oil or wash oil.
• Ammonia from coke oven gas using refrigerated water: This typically involves physical absorption of ammonia from coke oven gas into water under refrigerated conditions.
• Tar from coke oven gas in primary gas coolers using chilled water: This involves the physical removal of tar particles from coke oven gas using chilled water in primary gas coolers.