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Which of the following does not cause rusting of iron?

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in Chemistry – Class 12 by (188k points)
Which of the following does not cause rusting of iron?

(a) Moisture

(b) Vacuum

(c) SO2

(d) CO2

The question was asked in examination.

I'm obligated to ask this question of Electrochemistry in chapter Electrochemistry of Chemistry – Class 12

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The correct option is (b) Vacuum

For explanation I would say: Air and moisture accelerate corrosion. The most important factor in atmospheric corrosion, overriding pollution or lack of it, is moisture. Presence of gases like SO2 and CO2 in air catalyse the process of corrosion. Iron, when placed in vacuum, does not rust.

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