Which compound is used as a chemical sterilant and bleaching agent?
A. Ethanol
B. Methanol
C. Hydrogen peroxide
D. Acetone
Answer: Option C
Solution (By JKSSB Mock Tests)
Hydrogen peroxide (H₂O₂) is a strong oxidizing agent that kills microorganisms through oxidative damage and bleaches colored substances. It is used as a disinfectant (3% solution), in hair bleaching, and in the paper textile industry. Ethanol is a disinfectant but not a strong bleaching agent. Methanol is toxic, not used for sterilization. Acetone is a solvent.
Explanation:
Haematite (Fe₂O₃) is a major ore of iron. Bauxite is aluminium ore, galena is lead sulfide, cinnabar is mercury sulfide. Magnetite (Fe₃O₄) is another iron ore.
Explanation:
Silver has the highest thermal conductivity, followed by copper. It's also the best electrical conductor. Copper is more commonly used due to cost.
Explanation:
Smelting is the pyrometallurgical process of extracting a metal from its ore by heating it beyond its melting point and reducing the metal oxide with a carbonaceous reducing agent (like coke or coal). Flux is often added to remove impurities as slag. Calcination and roasting are oxidation processes.
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