When magnesium reacts with steam what would be the end product?
Correct answer: B. MgO
- A. Mg (OH)
- B. MgO
- C. MgO 10H2O
- D. MgO2
Explanation
Metals react with water under different conditions and produce metal oxide or hydroxide and liberate hydrogen gas. When magnesium reacts with liquid water Mg(OH)2 and H2 gas is formed by the following reaction: Mg + 2H2O → Mg(OH)2 + H2 But when magnesium reacts with steam MgO and H2 gas is formed by the following reaction: Mg(s) + 2H2O(g) → Mg(OH)2 (aq) + H2(g) Hence B is the correct answer
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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