B. Is a strong disinfectant and leaves no harmful residue
C. Adds minerals
D. Makes water acidic
Answer: Option B
Solution (By JKSSB Mock Tests)
Ozone (O₃) is a more powerful oxidant than chlorine; it destroys bacteria, viruses, and organic contaminants, and then decomposes to oxygen, leaving no residual taste or toxic disinfection by-products. However, it does not provide lasting protection in distribution pipes, so a small chlorine dose may be added. Ozonation also removes color and odor.
Explanation:
Bauxite (Al₂O₃·2H₂O) is the principal ore of aluminium. Haematite is Fe₂O₃, galena is PbS, cinnabar is HgS. Bauxite is refined by Bayer's process to produce alumina, then electrolytically reduced (Hall-Héroult process).
Explanation:
Covalent bonds are formed by the sharing of electrons, which typically occurs between two non-metal atoms that have high electronegativities and a tendency to gain electrons. Metals tend to lose electrons, forming ionic bonds with non-metals. Noble gases are generally inert and do not form bonds.
Explanation:
Ernest Rutherford discovered the atomic nucleus through his gold foil alpha-scattering experiment in 1911. He later discovered the proton in 1919 by bombarding nitrogen with alpha particles. J.J. Thomson discovered the electron, and Chadwick discovered the neutron.
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