What happens when water vapour is passed over red hot iron?

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Q: 93 (CDS-I/2004)
What happens when water vapour is passed over red hot iron?
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,8,22,4,12,8,6

keywords: 

{'water vapour': [0, 0, 1, 2], 'red hot iron': [0, 0, 1, 0], 'hydrogen': [0, 0, 1, 3], 'fe2os': [0, 0, 1, 0], 'fe203': [0, 0, 1, 2], 'oxygen': [3, 0, 1, 0], 'fe304': [0, 0, 1, 0]}