O-LevelChemistryMetals & Reactivity5070/22 · Oct/Nov 2019 · Q15 Marks

The diagram shows part of the Periodic Table. He B C N O F Ne Al Si P S Cl Ar Ga Ge As Se Br Kr I Xe Answer the questions using only the elements shown in the diagram. Each element may be used once, more than once or not at all. Write the symbol for an element which:

(a)forms a stable ion of type X2-[1]
(b)is a light green gas at room temperature[1]
(c)forms an ion which gives a yellow precipitate on addition of aqueous silver nitrate[1]
(d)is used to make food containers[1]
(e)is a diatomic gas which forms 78% of dry air.[1]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Structured question, 5 marks.
Source: O-Level Chemistry, Oct/Nov 2019 Paper 2 Variant 2, question 1.

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