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3.1 Introducing chemical reactions

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Question 38

Potassium manganate(VII) reacts with concentrated hydrochloric acid.

\mathrm{\mathit{a}KMnO_{4} + 16HCl \rightarrow 2KCl + 2MnCl_{2} + 8H_{2}O + \mathit{b}Cl_{2}}

What are the values of $a\,$ and $b\,$ in the balanced equation?

[1]

$a = 1$ and $b = 5$

$a = 2$ and $b = 3$

$a = 2$ and $b = 5$

$a = 2$ and $b = 6$

Markscheme

3.1 Introducing chemical reactions Questions

GCSE
Chemistry
3.1 Introducing chemical reactions

134 exam-style questions on OCR GCSE Chemistry 3.1 Introducing chemical reactions, covering 3.1.1 Writing formulae and balanced chemical equations, 3.1.2 Formulae of compounds from ions, and state symbols, 3.1.3 Conservation of mass and observed changes in mass, 3.1.4 Half equations and balanced ionic equations, 3.1.5 The mole and the Avogadro constant, and 3.1.6 Stoichiometry, limiting reactants and reacting masses. Each one has a worked solution and a mark scheme showing where the marks go.

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