10 Chemistry MCQS FOR CLASS TEN
✅ Set 1: Chemical Reactions and Equations
- What type of reaction is: Zn + H₂SO₄ → ZnSO₄ + H₂ ?
a) Decomposition
b) Combination
c) Displacement
d) Double displacement
✔️Answer: c) Displacement
Explanation: Zinc displaces hydrogen from sulfuric acid. - Which of the following is a redox reaction?
a) HCl + NaOH → NaCl + H₂O
b) 2Mg + O₂ → 2MgO
c) AgNO₃ + NaCl → AgCl + NaNO₃
d) CaCO₃ → CaO + CO₂
✔️Answer: b) 2Mg + O₂ → 2MgO
Explanation: Magnesium is oxidized; oxygen is reduced. - What is observed when lead nitrate is heated?
a) Oxygen gas is released
b) White precipitate forms
c) Brown fumes of NO₂ are evolved
d) Blue color is formed
✔️Answer: c) Brown fumes of NO₂ are evolved
Explanation: It’s a thermal decomposition reaction. - Which substance is oxidized in the reaction: CuO + H₂ → Cu + H₂O?
a) Cu
b) H₂
c) CuO
d) H₂O
✔️Answer: b) H₂
Explanation: Hydrogen loses electrons (oxidized). - What is the color of ferrous sulphate crystals?
a) White
b) Blue
c) Green
d) Yellow
✔️Answer: c) Green
Explanation: FeSO₄·7H₂O crystals are light green. - Which of the following reactions is a combination reaction?
a) NaOH + HCl → NaCl + H₂O
b) CaO + H₂O → Ca(OH)₂
c) 2KClO₃ → 2KCl + 3O₂
d) AgNO₃ + NaCl → AgCl + NaNO₃
✔️Answer: b) CaO + H₂O → Ca(OH)₂
Explanation: Two substances combine to form one product. - What is the balanced equation for combustion of methane?
a) CH₄ + O₂ → CO₂ + H₂O
b) CH₄ + 2O₂ → CO₂ + 2H₂O
c) CH₄ + O₂ → CO + H₂O
d) 2CH₄ + 3O₂ → 2CO + 4H₂O
✔️Answer: b) CH₄ + 2O₂ → CO₂ + 2H₂O
Explanation: Complete combustion of methane. - Which of these is a double displacement reaction?
a) Fe + CuSO₄ → FeSO₄ + Cu
b) Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃
c) H₂ + O₂ → H₂O
d) CaCO₃ → CaO + CO₂
✔️Answer: b) Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃
Explanation: Ions are exchanged between compounds. - What type of change is rusting of iron?
a) Physical change
b) Temporary change
c) Chemical change
d) Periodic change
✔️Answer: c) Chemical change
Explanation: New substances like iron oxide form. - Which gas is evolved when zinc reacts with hydrochloric acid?
a) Hydrogen
b) Oxygen
c) Nitrogen
d) Carbon dioxide
✔️Answer: a) Hydrogen
Explanation: Zn + 2HCl → ZnCl₂ + H₂↑