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Science and TechnologySEE 2081, Bagmati Province

Answer the questions on the basis of given chemical equations. Reaction A: MgO + H2O Mg(OH)2 Reaction B: Zn + dil H2SO4 ZnSO4 + H2 i) Out of these two chemical equations, which one is the…

2

Answer the questions on the basis of given chemical equations. Reaction A: Reaction B: i) Out of these two chemical equations, which one is the combination reaction? [1] ii) What happens when conc. is used instead of dil in chemical reaction B? [1]

Answer

· Based on the official syllabus and past papers
Updated

i) The combination reaction is Reaction A: Here, two substances (MgO and H₂O) combine to form a single product (Mg(OH)₂).

ii) When conc. H₂SO₄ is used instead of dil. H₂SO₄ in Reaction B, the following occurs:

  • No reaction takes place with zinc (Zn) because concentrated sulfuric acid is a strong oxidizing agent and does not release hydrogen gas ().
  • Instead, it produces sulfur dioxide () and water () along with zinc sulfate ():
Sulphuric acidSulphuric acid
Structure of Sulphuric acid

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