Which one of the following is not redox reaction?
Correct answer: B. MgO + 2HCl ⟶ MgCl2 + H2O
- A. Mg + 2HCl ⟶ MgCl2 + H2
- B. MgO + 2HCl ⟶ MgCl2 + H2O
- C. Cu + 4HNO3 ⟶ Cu(NO3)2 + 2H2O + 2NO2
- D. 2Mg + O2 ⟶ 2MgO
Explanation
The reaction MgO + 2H2O →MgCl2+ 2H2O is a double displacement reaction. A double displacement reaction is a chemical reaction in which two compounds exchange their ions to form two new compounds. In this reaction, magnesium oxide (MgO) and water (H2O) exchange their ions to form magnesium chloride (MgCl2) and two water molecules (H2O).The reaction can be broken down into two steps: Magnesium oxide reacts with water to form magnesium hydroxide Mg (OH)2MgO + H2O → Mg (OH)2. Magnesium hydroxide reacts with hydrochloric acid (HCl) to form magnesium chloride and water: Mg (OH)2+ HCl → MgCl2+ H2O.
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