Hydrogen peroxide is used as an antiseptic because it: MCQ with Answer and Explanation

Explanation:
Zymase (in yeast) converts sugars to ethanol, catalase (in liver) breaks down hydrogen peroxide, and amylase (in saliva) breaks down starch into sugars. All are biological enzymes that act as highly specific catalysts in biochemical reactions, functioning under mild conditions of temperature and pH.

Explanation:
Electrolysis of water splits it into hydrogen and oxygen, it is not a purification method but a decomposition. Reverse osmosis uses semipermeable membrane to remove ions and impurities. UV irradiation kills microorganisms. Distillation boils water and condenses steam, removing non-volatile impurities. Other methods: filtration, chlorination, ozonation, boiling.

Explanation:
Urea (CO(NH₂)₂) is a nitrogenous fertilizer with the highest nitrogen content (about 46%). Superphosphate provides phosphorus, muriate of potash (KCl) provides potassium, and gypsum (CaSO₄·2H₂O) is a soil conditioner providing calcium and sulfur, not primary NPK nutrients.