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Which of the following is not essential for rusting to take place?

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in Chemistry – Class 12 by (188k points)
Which of the following is not essential for rusting to take place?

(a) Metal (like iron)

(b) Oxygen

(c) Moisture

(d) Light

I had been asked this question at a job interview.

I need to ask this question from Electrochemistry topic in division Electrochemistry of Chemistry – Class 12

1 Answer

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Best answer
Correct choice is (d) Light

The best explanation: Rust is a general term for a series of iron oxides, usually, reddish-brown oxides, formed by the reaction of iron with oxygen in the presence of water or moisture. Water is usually present in the form of water vapour and oxygen is always present in the normal atmosphere. The oxygen needs moisture as a catalyst and reactant to accelerate the reaction, so in the absence of moisture, iron won’t rust.

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