Rusting of iron is catalysed by which of the following?
1
Fe
2
Zn
3
O
4
H
Official Solution
Correct Option:
(4)
Step 1: Identifying the rusting process. Rusting of iron involves both electrochemical reactions and the presence of an electrolyte. The presence of oxygen (O ) and moisture facilitates the process, but hydrogen ions (H ) catalyse the rusting by lowering the potential for the oxidation of iron. Step 2: Understanding the role of H . - (1) Fe: Iron itself is not a catalyst; it is the metal undergoing oxidation.
- (2) Zn: Zinc does not catalyse rusting; in fact, it is often used to protect iron through galvanization.
- (3) O : While oxygen is necessary for rusting, it is not the catalyst.
- (4) H : Hydrogen ions (acidic conditions) help in the corrosion process by facilitating the transfer of electrons during oxidation. Step 3: Conclusion. The correct answer is (4) H .
02
PYQ 2013
medium
chemistryID: met-2013
Mixture can be of:
1
A
2
B
3
Both (a) and (b)
4
None of these
Official Solution
Correct Option:
(2)
Step 1: Formula / Definition}
Step 2: Calculation / Simplification}
Aryl alkyl ethers react with HI to give phenol and alkyl iodide.
The cleavage occurs at the alkyl-oxygen bond, forming phenol as the main organic product along with alkyl iodide.
Thus, the product corresponds to option (b). Step 3: Final Answer
About Catalysis - MET
Catalysis is a vital chapter for MET aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
Frequently Asked Questions
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Review the topic breakdown to see which sub-topics within Catalysis carry the most weight. Then, tackle the questions iteratively to solidify your understanding.
