Skip to content

Course home

Question bank·3.3 Types of chemical reactions
Sign up

3.3 Types of chemical reactions

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263
Question 20

Chlorine reacts with iodide ions.

Cl2+2I−→2Cl−+I2 \mathrm{Cl_2 + 2I^- \rightarrow 2Cl^- + I_2} Cl2​+2I−→2Cl−+I2​

Which statement describes how the electrons lost and gained are balanced in this reaction?

[1]
A

One chlorine molecule gains two electrons in total, and two iodide ions lose two electrons in total.

B

One chlorine molecule gains four electrons in total, and two iodide ions lose four electrons in total.

C

One chlorine molecule loses two electrons in total, and two iodide ions gain two electrons in total.

D

One chlorine molecule gains one electron in total, and two iodide ions lose one electron in total.

Markscheme

3.3 Types of chemical reactions Questions

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

112 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.

More questions