Which of the following is a method of concentration of sulphide ores? MCQ with Answer and Explanation

Explanation:
Chlorine acts as a disinfectant, killing bacteria, viruses, and other pathogens, making water safe for drinking. It forms hypochlorous acid (HOCl) in water which is a strong oxidizing agent. Sedimentation and filtration remove suspended particles. Taste may be affected if excess chlorine or by-products form. Chlorine residual protects water in distribution pipes.

Explanation:
Methanol is metabolized in the body to formaldehyde and formic acid, which are highly toxic and can damage the optic nerve, causing permanent blindness or even death if ingested in significant amounts. Ethanol is used as an antidote because it competitively inhibits methanol metabolism by alcohol dehydrogenase. Methanol is used as industrial solvent and in illegal liquor (hooch) sometimes resulting in mass poisoning.

Explanation:
Radioactive decay emits alpha, beta, and gamma rays. Alpha particles are heavy and positively charged, stopped by paper. Beta particles are lighter, stopped by aluminum. Gamma rays are high-energy electromagnetic photons with no mass or charge, giving them the highest penetrating power; they require thick lead or concrete to be significantly attenuated.