Boiling water removes: MCQ with Answer and Explanation

Explanation:
At higher temperatures, the rate of diffusion increases because the kinetic energy of the gas molecules (food aroma) increases. Thus, the smell of hot food diffuses faster and reaches further. Both statements are correct, and the increased kinetic energy perfectly explains the enhanced diffusion rate observed in the assertion.

Explanation:
Ozone (O₃) is a powerful disinfectant that decomposes to oxygen, leaving no toxic residues or taste. Chlorination can form carcinogenic trihalomethanes (THMs) with organic matter. However, ozone is more expensive, must be generated on-site, and leaves no residual protection in distribution system, often requiring a small chlorine dose. Ozonation also removes color and odor. Both kill bacteria and viruses.

Explanation:
Hydraulic washing, also known as gravity separation, is based on the difference in specific gravities (densities) of the metallic ore and the associated impurities (gangue). The powdered ore is washed with a running stream of water; the lighter impurities are carried away, leaving the heavier ore particles behind.