Oxidation and Reduction (Redox Reactions)Practice Questions & MCQs
Practice Oxidation and Reduction (Redox Reactions) questions from Chemical Reactions and Equations (Class 10 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Oxidation and Reduction (Redox Reactions)Quiz - Solve & Score
Q1. Which of the following is a redox reaction (NCERT)?
- A.BaCl2 + Na2SO4 -> BaSO4 + 2NaCl
- B.MnO2 + 4HCl -> MnCl2 + Cl2 + 2H2O
- C.CaO + H2O -> Ca(OH)2
- D.NaOH + HCl -> NaCl + H2O
Answer: B. MnO2 + 4HCl -> MnCl2 + Cl2 + 2H2O
Q2. Which statement is true for the reaction H2 + Cl2 -> 2HCl?
- A.Neither is oxidised nor reduced
- B.Hydrogen is reduced and chlorine is oxidised
- C.Hydrogen is oxidised and chlorine is reduced
- D.Both are reduced
Answer: C. Hydrogen is oxidised and chlorine is reduced
Q3. Which of the following is a redox reaction?
- A.CaO + H2O -> Ca(OH)2
- B.ZnO + C -> Zn + CO
- C.AgNO3 + NaCl -> AgCl + NaNO3
- D.NaOH + HCl -> NaCl + H2O
Answer: B. ZnO + C -> Zn + CO
NCERT fact (chemistry, chapter 'Chemical Reactions and Equations'): Oxidation = addition of O or loss of H or electrons; reduction = addition of H or loss of O or gain of electrons; tag each species: the one losing e- is oxidised => apply this rule to the stem reaction to pick the answer = ZnO + C -> Zn + CO. Why option B fits - Correct. Distractor analysis: option A) 'CaO + H2O -> Ca(OH)2' doesn't hold - Combination with no oxidation-state change; option C) 'AgNO3 + NaCl -> AgCl + NaNO3' is incorrect: Double displacement; no electron transfer. Final answer - B) ZnO + C -> Zn + CO.
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