The process of concentrating an ore by taking advantage of the difference in density between the ore and the gangue is: MCQ with Answer and Explanation
The process of concentrating an ore by taking advantage of the difference in density between the ore and the gangue is:
A. Froth flotation
B. Magnetic separation
C. Hydraulic washing
D. Leaching
Answer: Option C
Solution (By JKExamLibrary)
Hydraulic washing, also known as gravity separation, is based on the difference in specific gravities (densities) of the metallic ore and the associated impurities (gangue). The powdered ore is washed with a running stream of water; the lighter impurities are carried away, leaving the heavier ore particles behind.
Explanation:
Urea (NH₂CONH₂) has molar mass 60, with 28 g N, percentage = (28/60)×100 ≈ 46.6%. Rounded to 46%. It is the most concentrated solid nitrogen fertilizer. Ammonium nitrate is 33%, ammonium sulfate 21%.
Explanation:
Faraday's second law: When the same quantity of electricity is passed through different electrolytes, the masses of substances deposited are proportional to their equivalent weights (E). m₁/m₂ = E₁/E₂. Equivalent weight = atomic mass / valency (or change in oxidation number). This law is used to calculate the amount of metal deposited or gas liberated. Electrolysis is quantitative.
Explanation:
Stainless steel is an iron alloy containing at least 10.5% chromium, which provides corrosion resistance by forming a passive chromium oxide layer. Nickel and molybdenum may also be added. Copper and zinc are components of brass. Lead is used in batteries and solder. Chromium is essential for 'stainless' property.
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