Which method is used for the concentration of an ore based on the difference in density between the ore and impurities? MCQ with Answer and Explanation
Which method is used for the concentration of an ore based on the difference in density between the ore and impurities?
A. Leaching
B. Froth flotation
C. Hydraulic washing
D. Magnetic separation
Answer: Option C
Solution (By JKSSB Mock Tests)
Hydraulic washing (or gravity separation) is based on the difference in specific gravities (densities) of the ore and the gangue (impurities). The powdered ore is washed with a stream of water; lighter impurities are washed away, leaving the heavier ore particles behind.
Explanation:
A molecule is a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction while retaining the composition and chemical properties of that substance. For example, H₂O molecule shows properties of water. Atoms (like He) can also be independent, but a molecule of an element (O₂) or compound retains identity.
Explanation:
Gypsum (CaSO₄·2H₂O) is added to clinker to control the rapid reaction of tricalcium aluminate with water, which would otherwise cause flash (quick) setting. Gypsum slows down the hydration of C₃A, thus increasing the setting time and allowing workability. Without gypsum, cement would set almost immediately upon mixing with water, making placement impossible.
Explanation:
This is a single displacement reaction. Iron (Fe) is more reactive than Copper (Cu), so it displaces copper from its aqueous sulfate solution. The blue color of CuSO₄ fades, and a brown deposit of Cu forms. Reactivity series dictates that a more reactive metal displaces a less reactive one.
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