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3.3 Types of chemical reactions

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Question 2
F

In which reaction is the first reactant reduced?

[1]
A

2Mg+CO2→2MgO+C\mathrm{2Mg + CO_{2} \rightarrow 2MgO + C}2Mg+CO2​→2MgO+C

B

2SO2+O2⇌2SO3\mathrm{2SO_{2} + O_{2} \rightleftharpoons 2SO_{3}}2SO2​+O2​⇌2SO3​

C

CH4+2O2→CO2+2H2O\mathrm{CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O}CH4​+2O2​→CO2​+2H2​O

D

PbO+H2→Pb+H2O\mathrm{PbO + H_{2} \rightarrow Pb + H_{2}O}PbO+H2​→Pb+H2​O

Markscheme

3.3 Types of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.3 Types of chemical reactions

53 exam-style questions on OCR GCSE Chemistry 3.3 Types of chemical reactions, covering 3.3.1 Oxidation and reduction in terms of oxygen, 3.3.2 Acids, alkalis and neutralisation, 3.3.3 The pH scale and measuring pH, 3.3.4 Oxidation and reduction in terms of electrons, 3.3.5 Dilute and concentrated, weak and strong acids, and 3.3.6 Hydrogen ion concentration and pH. Each one has a worked solution and a mark scheme showing where the marks go.

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