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    Question

    Which of the following metals does not liberate hydrogen

    gas when reacted with cold water but does so with steam?
    A Sodium Correct Answer Incorrect Answer
    B Potassium Correct Answer Incorrect Answer
    C Magnesium Correct Answer Incorrect Answer
    D Copper Correct Answer Incorrect Answer

    Solution

    Magnesium reacts very slowly with cold water, and the reaction may not be observable at room temperature. However, when heated with steam, magnesium reacts more vigorously, forming magnesium oxide (MgO) and hydrogen gas (H ₂ ). Reaction with steam: Mg (s) + H ₂ O (g) → MgO (s) + H ₂  (g)

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