Balancing, types, redox, stoichiometryPractice Questions & MCQs
Practice Balancing, types, redox, stoichiometry 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.
Balancing, types, redox, stoichiometryQuiz - Solve & Score
Q1. Hydrogen peroxide can act both as an oxidising agent and a reducing agent. In which reaction does H2O2 act as a REDUCING agent?
- A.Cl2 + H2O2 → 2HCl + O2
- B.PbS + 4H2O2 → PbSO4 + 4H2O
- C.2KI + H2O2 → 2KOH + I2
- D.Na2SO3 + H2O2 → Na2SO4 + H2O
Answer: A. Cl2 + H2O2 → 2HCl + O2
NCERT fact (chemistry, chapter 'Chemical Reactions and Equations'): In Cl2 + H2O2 → 2HCl + O2, oxygen goes -1 → 0 (lost electrons) so H2O2 is oxidised - hence it is the reducing agent. In all other choices oxygen goes -1 → -2 (gained electrons) so H2O2 acts as an oxidant. Trap PbS one is classic but H2O2 is OXIDANT there. Final answer - A) Cl2 + H2O2 → 2HCl + O2.
Q2. What volume (at STP, 22.4 L/mol) of NH3 is needed to neutralise 245 g of pure H2SO4 (M=98) completely (2NH3 + H2SO4 → (NH4)2SO4)?
- A.112 L
- B.56 L
- C.22.4 L
- D.224 L
Answer: A. 112 L
Q3. Reactivity-series prediction: which of the following pairs will NOT react in aqueous solution?
- A.Cu(s) + ZnSO4(aq)
- B.Zn(s) + FeSO4(aq)
- C.Fe(s) + CuSO4(aq)
- D.Mg(s) + 2HCl(aq)
Answer: A. Cu(s) + ZnSO4(aq)
What does the chapter say about this? Cu is BELOW Zn in the activity series, so it cannot displace Zn^2+ from solution. The other three: Zn is above Fe; Fe is above Cu; Mg is above H, so all proceed spontaneously. Pick: A) Cu(s) + ZnSO4(aq).
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