In electroplating, the object to be plated is made the:
A. Cathode
B. Salt bridge
C. Electrolyte
D. Anode
Answer: Option A
Solution (By JKExamLibrary)
In electroplating, the object to be electroplated is connected as the cathode, where metal cations in the electrolyte are reduced to metal atoms and deposited as a coating. The anode is usually the plating metal, which oxidizes and dissolves, replenishing the electrolyte. For example, silver plating: cathode is the article, anode is pure silver, electrolyte is AgCN/AgNO₃.
Explanation:
Hydrogen has about 150 kJ/g (highest). Petrol ~47 kJ/g, coal ~25-35 kJ/g, cow dung cake ~8 kJ/g. Hydrogen produces only water on combustion and is a clean fuel.
Explanation:
Hydrogen has ~150 kJ/g; LPG ~50 kJ/g; CNG ~55 kJ/g; diesel ~45 kJ/g. Hydrogen has highest energy per mass but low density, posing storage challenges.
Explanation:
J.J. Thomson discovered the electron in 1897 using a cathode ray tube. He showed that cathode rays were composed of negatively charged particles (electrons) that were much lighter than atoms and were a fundamental part of all matter, leading to his plum pudding model.
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