Ozonation of water is preferred over chlorination because:
A. It is cheaper.
B. It is easier to transport.
C. It removes hardness.
D. It does not leave any harmful residual taste or toxic byproducts.
Answer: Option D
Solution (By JKExamLibrary)
Ozonation is a powerful disinfection method that kills bacteria and viruses faster than chlorine. Unlike chlorine, ozone decomposes back into oxygen and does not leave a residual taste or form harmful chlorinated organic byproducts (like trihalomethanes), making it safer for drinking water.
Explanation:
Elements in the same group (vertical column) have the same number of valence electrons, resulting in similar chemical properties. For example, all Group 1 elements have 1 valence electron (ns¹). The number of shells increases down the group. Atomic mass varies. This similarity was the basis for Mendeleev's grouping. Modern table uses atomic number for ordering.
Explanation:
Polythene (polyethylene) softens on heating and can be remolded, thus thermoplastic. Bakelite and melamine are thermosetting (cannot be remolded). Vulcanized rubber is also thermoset due to cross-linking. Thermoplastics have linear or branched chains, no cross-links.
Explanation:
Catalase is an enzyme found in nearly all living organisms, particularly high in liver and red blood cells. It catalyzes the decomposition of toxic hydrogen peroxide to water and oxygen: 2H₂O₂ → 2H₂O + O₂. This protects cells from oxidative damage. It has one of the highest turnover numbers. Stomach has pepsin.
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