Question

write the condition is until for rusting of iron object

Answer 1

moist air condition until for rusting of iron

Answer 2

The presence of water and oxygen is essential for the rusting of iron.
Impurities in the iron, the presence of water vapor, acids, salts and carbon dioxide hastens rusting.
Pure iron does not rust in dry and carbon dioxide free air.
It also does not rust in pure water, free from dissolved salts.Metals like chromium, zinc and magnesium prevent rusting to a great extent and alkalis also help to prevent rusting.

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