Soap molecules have two ends with different properties. They are:
A. Lipophobic and hydrophobic
B. Hydrophobic and hydrophilic
C. Both A and B
D. Hydrophilic and lipophilic
Answer: Option C
Solution (By JKExamLibrary)
A soap molecule has a long hydrocarbon chain which is hydrophobic (water-repelling) or lipophilic (fat-loving), and an ionic head (usually -COO⁻Na⁺) which is hydrophilic (water-loving) or lipophobic (fat-repelling). Both A and B correctly describe these dual properties essential for cleaning action.
Explanation:
Zn + 2HCl → ZnCl₂ + H₂↑. Zinc displaces hydrogen from acid because it is more reactive than hydrogen in the reactivity series. Hydrogen gas burns with a pop sound when a burning splint is brought near the mouth of the test tube. Metals above hydrogen in the series react with acids to evolve H₂; metals below (Cu, Ag) do not. Nitric acid is an oxidizer, so may not yield H₂.
Explanation:
Ozone (O₃) is a powerful disinfectant that decomposes to O₂, leaving no residual taste or odor. However, it must be generated on-site and provides no lasting protection. Chlorine leaves residual.
Explanation:
Inert electrodes do not participate in the chemical reaction; they merely provide a surface for electron transfer. Platinum and graphite are common inert electrodes. Copper, zinc, and silver are active electrodes and can dissolve or deposit during electrolysis, thereby participating in the chemical change.
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