Chemistry 0620 · IGCSE · Elements, compounds and mixtures

Elements, compounds and mixtures — practice question

A set of compounds is listed below. aluminium oxide calcium bromide calcium oxide ethane ethene hydrogen chloride methane nitrogen dioxide potassium iodide potassium manganate(VII) sodium chloride Use only compounds from the list above to answer the questions that follow. Each compound may be chosen once, chosen more than once, or not chosen at all.
(a(i))[1]

Which compound, in acidified solution, is used to test for sulfur dioxide?

(a(ii))[1]

Which compound is the chief constituent of natural gas?

(a(iii))[1]

Which compound, when dissolved in water, gives a yellow precipitate after acidified aqueous silver nitrate is added?

(a(iv))[1]

Which compound is used during flue gas desulfurisation to remove acidic gases?

(a(v))[1]

Which compound acts as a reactant in the manufacture of ethanol?

(b)[2]

What does the term compound mean?

(c)[2]

Complete the electronic arrangement for a molecule of hydrogen chloride. Display only the outer-shell electrons.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “acidified $\text{KMnO}_4$” …

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