Q: 36 (NDA-I/2008)

When iron is left exposed in open air, it gets rested. Which costituent (s) of air is/ are responsible for rusting iron?
1. Oxygen gas present in air
2. Moisture present in air
3. Carbon dioxide gas present in air
Select the correct answer using the code given below :
question_subject: 
Science
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0,920,264,112,104,920,48