To an acidified dichromate solution, a pinch of Na2O2 is added and shaken. What is observed? — s Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: In closed systems like submarines, carbon dioxide levels must be kept low and oxygen levels must be replenished. Step 2: Sodium peroxide (Na2O2) reacts with both water vapor and carbon dioxide present in exhaled air: 2Na2O2 + 2CO2 -> 2Na2CO3 + O2. Step 3: Because Na2O2 simultaneously traps the exhaled carbon dioxide gas and generates breathable oxygen gas, it is highly suitable for air purification. Thus, option (a) is correct.