Which method is used to obtain completely demineralized water?
A. Distillation
B. Filtration
C. Ion-exchange process
D. Sedimentation
Answer: Option C
Solution (By JKExamLibrary)
The ion-exchange process (using cation and anion exchange resins) removes all dissolved cations and anions from water, producing completely demineralized (deionized) water. Distillation removes most impurities but may still contain trace dissolved gases or volatile organics.
Explanation:
CO₂ levels have risen due to burning fossil fuels, enhancing greenhouse effect. Methane, N₂O also contribute. Nitrogen and oxygen are not greenhouse gases.
Explanation:
Ethene (C2H4) is an alkene containing a reactive carbon-carbon double bond. When bromine water (brown) is added to ethene, the double bond breaks and bromine atoms add across it to form 1,2-dibromoethane (colorless). This addition reaction decolorizes the bromine water, serving as a test for unsaturation.
Explanation:
Fractional distillation is specifically designed to separate miscible liquids whose boiling points differ by less than 25 K. It uses a fractionating column which provides surfaces for repeated evaporation and condensation, enriching the vapor with the more volatile component before it reaches the condenser.
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