Which electrolyte is used in the electroplating of silver?
A. AgCl solution
B. CuSO₄ solution
C. NaCl solution
D. AgNO₃ solution
Answer: Option D
Solution (By JKExamLibrary)
For silver electroplating, the electrolyte is typically a solution of silver cyanide (AgCN) in excess potassium cyanide or silver nitrate (AgNO₃). AgNO₃ with proper complexing agents can be used. CuSO₄ is for copper plating. NaCl is not suitable. The anode is pure silver, cathode is the article. Silver ions migrate to cathode and are reduced to metal.
Explanation:
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:
Zinc coating (galvanizing) provides both barrier and sacrificial protection. Even if scratched, zinc corrodes instead of iron because it is more reactive.
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