Electrochemistry
2 solved JEE Chemistry previous year questions on Electrochemistry, each with the correct answer and a full explanation.
Q1
From the following select the one which is not an example of corrosion? [Re-NEET 2024]
✓ Correct answer: b) Production of hydrogen by electrolysis of water
ExplanationThe option that is not an example of corrosion is: B. Production of hydrogen by electrolysis of water Explanation: A. Rusting of iron object is a type of corrosion where iron reacts with oxygen and moisture to form iron oxides (rust).C. Tarnishing of silver involves the formation of silver sulfide on the surface of silver items due to a reaction with sulfur compounds in the air.D. Development of green coating on copper and bronze ornaments is caused by the formation of copper carbonate or copper chloride, known as patina, which is also a form of corrosion.Option B refers to a chemical reaction in which water is split into hydrogen and oxygen gases through electrolysis, and is not related to the process of corrosion.
Q2
The role of fluorspar, which is added in small quantities in the electrolysis reduction of alumina dissolved in fused cryolite, is
✓ Correct answer: b) to make fused mixture conducting
ExplanationThe electrolysis of is carried out in the steel tank linked inside with graphite.The graphite lining serves as cathode.The anode is also made of graphite rods hanging in the molten mass the electrolyte consist of alumina dissolved in fused cryolite and .Cryolite lower the melting point of alumina to and . increase the fluidity of the mass, so that the liberated aluminum metal may sink at the bottom & it is tapped off.
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