When hot magnesium metal is heated with steam, the gas evolved is
ACarbon dioxide, with formation of carbonate
BOxygen, with formation of magnesium peroxide
CNitrogen, with formation of magnesium nitride
DHydrogen, with formation of magnesium oxide
Answer & Solution
Correct answer: D. Hydrogen, with formation of magnesium oxide
1. The chapter lists magnesium among reactive metals.
2. Steam (H2O) oxidises magnesium to MgO.
3. Hydrogen is liberated in the process.
4. So option A is correct.
_Source: Selina Concise Chemistry Class 8, Ch on Hydrogen (Mistral OCR'd PDF), section on reaction with steam_
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