The main difference between diamond and graphite is: MCQ with Answer and Explanation

Explanation:
Cooking of food involves chemical reactions (e.g., denaturation of proteins, caramelization of sugars) that form new substances, making it a chemical change. Dissolving sugar in water is a physical change because no new substance is formed (sugar can be recovered by evaporation). Breaking glass is a physical change (change in size/shape). Melting wax is a physical change (change of state).

Explanation:
Electrolysis of water decomposes it into hydrogen and oxygen, not purification. Boiling kills microbes, filtration removes particulate matter, chlorination disinfects. Other methods: UV treatment, ozonation, reverse osmosis, distillation. Electrolysis is a chemical decomposition technique.

Explanation:
Diammonium phosphate (DAP), with the formula (NH4)2HPO4, is a widely used complex fertilizer. It provides two essential macronutrients: nitrogen (from the ammonium ion) and phosphorus (from the phosphate ion). Urea and ammonium sulfate provide only nitrogen, while muriate of potash provides potassium.