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AP Intermediate 1st Year Redox Reactions — practice questions — page 2

Explore 55 free Redox Reactions questions in AP Intermediate 1st Year Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Redox Reactions questions and exercises with answers

Showing questions 31–55 of 55.

As per your syllabus, eqn 7.45, in 2H₂O₂(aq) → 2H₂O(l) + O₂(g), the oxidation states of O in H₂O₂, O₂, and H₂O are which set?Read the answer and worked solution →As per your syllabus, eqn 7.48, Cl₂(g) + 2 OH⁻ → ClO⁻ + Cl⁻ + H₂O has Cl in which oxidation states in products?Read the answer and worked solution →As per your syllabus, which halogen does NOT undergo disproportionation with alkali (unlike Cl₂, Br₂, I₂)?Read the answer and worked solution →As per your syllabus, among the chlorine oxoanions ClO⁻, ClO₂⁻, ClO₃⁻, ClO₄⁻, which one does NOT disproportionate?Read the answer and worked solution →As per your syllabus, eqn 7.40, the reaction 2 H₂O + 2 F₂ → 4 HF + O₂ shows which species being oxidised?Read the answer and worked solution →As per your syllabus, the TWO methods used to balance redox reactions are which?Read the answer and worked solution →As per your syllabus, the balanced ionic equation for Cr₂O₇²⁻ + SO₃²⁻ → Cr³⁺ + SO₄²⁻ in acid solution uses how many H⁺ ions on the reactant side?Read the answer and worked solution →As per your syllabus, the same Cr₂O₇²⁻ + SO₃²⁻ balanced equation produces how many H₂O molecules on the product side?Read the answer and worked solution →As per your syllabus, Step 4 for an ACIDIC medium adds which species?Read the answer and worked solution →As per your syllabus, eqn 7.54, the balanced reduction half-reaction for Cr₂O₇²⁻ in acidic medium consumes how many H⁺?Read the answer and worked solution →As per your syllabus, eqn 7.54, the balanced reduction half-reaction for Cr₂O₇²⁻ in acidic medium gains how many electrons?Read the answer and worked solution →As per your syllabus, for a BASIC medium, oxygen balance is achieved by adding which species?Read the answer and worked solution →As per your syllabus, the balanced reaction of MnO₄⁻ with Br⁻ in BASIC medium gives MnO₂ and which Br species?Read the answer and worked solution →As per your syllabus, OXIDATION in terms of oxidation number means which change?Read the answer and worked solution →As per your syllabus, in 2Cu₂O(s) + Cu₂S(s) → 6Cu(s) + SO₂(g), which species is REDUCED?Read the answer and worked solution →As per your syllabus, the reaction N₂(g) + O₂(g) → 2 NO(g) is classified as which type of redox?Read the answer and worked solution →As per your syllabus, the reaction 2 NO₂(g) + 2 OH⁻ → NO₂⁻ + NO₃⁻ + H₂O is classified as which type?Read the answer and worked solution →In the modern electron-transfer view, a REDUCING AGENT isRead the answer and worked solution →The reaction $\mathrm{Zn}(s) + \mathrm{CuSO}_4(aq) \rightarrow \mathrm{ZnSO}_4(aq) + \mathrm{Cu}(s)$ is best classified as which type of redox reaction?Read the answer and worked solution →What is the oxidation number of manganese in potassium permanganate, $\mathrm{KMnO}_4$? (K is $+1$, O is $-2$ in non-peroxides.)Read the answer and worked solution →What is the oxidation number of chromium in potassium dichromate, $\mathrm{K}_2\mathrm{Cr}_2\mathrm{O}_7$?Read the answer and worked solution →In the thiosulphate ion $\mathrm{S}_2\mathrm{O}_3^{2-}$, what is the AVERAGE oxidation number of sulphur?Read the answer and worked solution →How many electrons are transferred per dichromate ion when $\mathrm{Cr}_2\mathrm{O}_7^{2-}$ is reduced to $\mathrm{Cr}^{3+}$ in acidic medium?Read the answer and worked solution →Balance the half-reaction $\mathrm{MnO}_4^- \rightarrow \mathrm{Mn}^{2+}$ in acidic medium. How many electrons are transferred per $\mathrm{MnO}_4^-$ ion?Read the answer and worked solution →What is the AVERAGE oxidation number of sulphur in the tetrathionate ion $\mathrm{S}_4\mathrm{O}_6^{2-}$?Read the answer and worked solution →

Worked practice questions

As per your syllabus, eqn 7.45, in 2H₂O₂(aq) → 2H₂O(l) + O₂(g), the oxidation states of O in H₂O₂, O₂, and H₂O are which set?

  1. 0, +1, −1
  2. −2, 0, −1
  3. −1, 0, −2
  4. −1, −2, 0
Show answer and solution

Correct answer: C. −1, 0, −2

syllabus eqn 7.45: H₂O₂ has O at −1 (peroxide) O₂ has O at 0; H₂O has O at −2. Classic disproportionation of O.

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As per your syllabus, eqn 7.48, Cl₂(g) + 2 OH⁻ → ClO⁻ + Cl⁻ + H₂O has Cl in which oxidation states in products?

  1. +1 and +5
  2. +5 and −1
  3. +3 and −1
  4. +1 and −1
Show answer and solution

Correct answer: D. +1 and −1

syllabus eqn 7.48: Cl₂ (0) disproportionates to ClO⁻ (Cl = +1) and Cl⁻ (Cl = −1). Basis of bleach manufacture.

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As per your syllabus, which halogen does NOT undergo disproportionation with alkali (unlike Cl₂, Br₂, I₂)?

  1. F₂
  2. Cl₂
  3. I₂
  4. Br₂
Show answer and solution

Correct answer: A. F₂

Your syllabus: F is the most electronegative element and cannot reach +ve ox. state, so it cannot disproportionate.

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