Redox Reactions Quiz | A-Level Chemistry OCR

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This quiz contains 10 questions from a mix of 1 subtopics.

Select the correct redox equation formed from the combination of the following half equations:

Cu ➔ Cu²⁺ + 2e^-

NO₃^- + 2H⁺ + e^- ➔ H₂O + NO₂

Cu + 2NO₃^- + 4H⁺ ➔ Cu²⁺ + H₂O + 2NO₂

Cu + NO₃^- + 2H⁺ ➔ Cu²⁺ + H₂O + NO₂

Cu + 2NO₃^- + 4H⁺ ➔ Cu²⁺ + 2H₂O + 2NO₂

Cu + 2NO₃^- + 2H⁺ ➔ Cu²⁺ + H₂O + 2NO₂

Select the correct oxidation half-equation in the reaction 2H₂O₂ ➔ 2H₂O + O₂.

H₂O₂ + 2H⁺ ➔ 2H₂O + 2e^-

H₂O₂ + 2H⁺ + 2e^- ➔ 2H₂O

H₂O₂ ➔ O₂ + 2H⁺ + 2e^-

H₂O₂ + 2e^- ➔ O₂ + 2H⁺

Select the correct reduction half-equation in the reaction 2H₂O₂ ➔ 2H₂O + O₂.

H₂O₂ + 2e^- ➔ O₂ + 2H⁺

H₂O₂ + 2H⁺ ➔ 2H₂O + 2e^-

H₂O₂ ➔ O₂ + 2H⁺ + 2e^-

H₂O₂ + 2H⁺ + 2e^- ➔ 2H₂O

Identify which equation is not a redox process.

2Cu₂O + Cu₂S ➔ 6Cu + SO₂

Cu + 2HCl ➔ CuCl₂ + H₂

Cu₂O ➔ Cu + CuO

Cu₂O + 2HCl ➔ 2CuCl + H₂O

Write the balanced half equations for the reaction Cu + 2HNO₃ ➔ Cu(NO₃)₂ + H₂

What is the reducing agent in the reaction: CuO_(s) + H_2(g) ➔ Cu_(s) + H₂O_(l)?

H₂O

CuO

H₂

What is the oxidising agent in the reaction: Cl_2(g) + H_2(g) ➔ 2HCl_(g)?

Cl₂

H₂O

HCl

H₂

What is the half equation for the reduction of copper in the reaction: CuO_(s) + H_2(g) ➔ Cu_(s) + H₂O_(l)?

Cu²⁺ + 2e^- ➔ Cu

CuO ➔ Cu + O^2-

CuO + 2e^- ➔ Cu + O^2-

Cu ➔ Cu²⁺ + 2e^-

In the following reaction, chlorine is the agent and magnesium is the agent.

Mg_(s) + Cl_2(g) ➔ MgCl_2(s)

oxidising

reducing

Select the correct half-equation which describes the reduction of bromine.

Br₂ ➔ 2Br^- + 2e^-

Br₂ ➔ Br^- + e^-

Br₂ + 2e^- ➔ 2Br^-

Br₂ + e^- ➔ Br^-