D. Separating dissolved substances by differential adsorption
Answer: Option D
Solution (By JKSSB Mock Tests)
Chromatography separates components of a mixture based on their different affinities for stationary and mobile phases. Used for dyes, drugs, amino acids.
Explanation:
Chromium (minimum 10.5%) forms a thin, adherent, transparent oxide layer (Cr₂O₃) on the surface, preventing further oxidation. Nickel adds ductility and enhances corrosion resistance. Iron is the base; carbon is for hardness but not corrosion resistance.
Explanation:
Urea is synthesized by reacting ammonia and carbon dioxide under high pressure and temperature: 2NH₃ + CO₂ → NH₂COONH₄ (ammonium carbamate) → (NH₂)₂CO + H₂O. This is the Bosch-Meiser urea process. It is the most concentrated solid nitrogenous fertilizer. Urea is also used in animal feed, plastics, and pharmaceuticals.
Explanation:
Caustic soda is NaOH (sodium hydroxide). It is a strong base used in soap, paper, and textile industries. Washing soda is Na₂CO₃, baking soda NaHCO₃. Caustic potash is KOH.
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