Chemical Reactions Quiz

Which metal cannot displace hydrogen from dilute hydrochloric acid?

• Zinc

• Lead

• Copper

• Iron

Which of the following compounds decomposes in presence of sunlight?

• CaCO₃

• AgBr

• ZnCO₃

• PbO

Which nitrate gives only oxygen gas on heating?

• AgNO₃

• NaNO₃

• Cu(NO₃)₂

• Pb(NO₃)₂

Which is a correct example of a thermal decomposition reaction?

• Zn + HCl ⟶ ZnCl₂ + H₂

• CaCO₃ ⟶ CaO + CO₂

• NH₃ + HCl ⟶ NH₄Cl

• NaCl + AgNO₃ ⟶ AgCl + NaNO₃

Identify the element that can displace zinc from ZnSO₄ solution:

• Mg

• Cu

• Pb

• Ag

Which of the following carbonates decomposes most easily on heating?

• Na₂CO₃

• CaCO₃

• CuCO₃

• K₂CO₃

Which one is not a redox reaction?

• Zn + CuSO₄ ⟶ ZnSO₄ + Cu

• AgNO₃ + NaCl ⟶ AgCl + NaNO₃

• 2H₂ + O₂ ⟶ 2H₂O

• Fe + H₂SO₄ ⟶ FeSO₄ + H₂

Which salt gives brown fumes on thermal decomposition?

• KNO₃

• NaNO₃

• Pb(NO₃)₂

• Ca(NO₃)₂

Which of the following metals is least reactive?

• Sodium

• Zinc

• Copper

• Potassium

Identify the correct balanced thermal decomposition of potassium chlorate:

• 2KClO₃ → 2KCl + 3O₂

• KClO₃ → KCl + O₂

• KClO₃ → K + Cl₂ + O₂

• 2KClO₃ → 2KClO₂ + O₂