The properties of oxides
2 marks · HardWhen phosphorus is burned in oxygen, phosphorus(V) oxide is formed. State whether phosphorus(V) oxide is acidic, basic or neutral. Give a reason for your answer.
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Phosphorus(V) oxide is acidic because it is an oxide of a non-metal.
Also accept: It is acidic because it is formed from a non-metal; Acidic as it is a non-metal oxide
Common mistakes: Basic because it is an oxide; Neutral
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Marking points
B1 · 1 mark · States phosphorus(V) oxide is acidic.
B2 · 1 mark · Gives correct reason, e.g., because it is a non-metal oxide or made from a non-metal.
Worked solution
Phosphorus(V) oxide is acidic because phosphorus is a non-metal and its oxide reacts as an acid.