Hydrogen peroxide is used as an antiseptic because it:
A. Is a strong acid
B. Reduces bacteria
C. Dehydrates cells
D. Oxidizes bacterial cell components
Answer: Option D
Solution (By JKExamLibrary)
H₂O₂ is a strong oxidizing agent that damages bacterial cell walls, membranes, and essential biomolecules through oxidation, killing microorganisms. It is used as a 3% solution for wound cleaning. The foaming action is due to catalase in tissues breaking it down, releasing O₂. It is not a reducing agent, acid, or dehydrating agent.
Explanation:
In H₂ + Cl₂ → 2HCl, hydrogen is oxidized (0 to +1) and chlorine is reduced (0 to -1). Thus it's a redox reaction. The others: A and C are double displacement with no oxidation state change; D is decomposition with no change (Ca +2, C +4, O -2 throughout).
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 bromide (AgBr) decomposes on exposure to light (photochemical decomposition) forming silver and bromine: 2AgBr(s) → 2Ag(s) + Br₂(g). This is used in photographic films to capture images. AgCl also light-sensitive but AgBr is primarily used. Calcium carbonate decomposition is thermal. Water electrolysis is electric decomposition.
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