Ozonation in water treatment is better than chlorination because it:
A. Is cheaper
B. Leaves no harmful residue
C. Is easier to store
D. Adds minerals
Answer: Option B
Solution (By JKExamLibrary)
Ozone decomposes to O₂, leaving no residual taste or toxic by-products like trihalomethanes. However, it must be generated on-site and is more expensive.
Explanation:
The long non-polar hydrocarbon tail is hydrophobic and dissolves in grease/oil. The ionic head (carboxylate) is hydrophilic and interacts with water. This dual nature enables micelle formation and cleaning.
Explanation:
A catalyst does not initiate a reaction; it only changes the rate of a reaction that is already thermodynamically feasible. It provides an alternative pathway with lower activation energy. It does not change the overall enthalpy (ΔH) or the equilibrium position, and it is recovered unchanged in mass.
Explanation:
In PCl₅, phosphorus forms five covalent bonds with five chlorine atoms. Phosphorus has 5 valence electrons (3s²3p³), and by using d-orbitals, it can expand its octet to accommodate 5 bonds. Thus its covalency is 5. In PCl₃, it is 3. Valency is the number of bonds formed. The oxidation state of P in PCl₅ is +5.
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