O LevelChemistryCambridge (CIE)Exam Questions10. Chemistry of the Environment10.2 Fertilisers

Fertilisers (Cambridge (CIE) O Level Chemistry): Multiple Choice Questions

Exam code: 5070

2 hours28 questions

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10.2 Fertilisers

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1
1 mark

What essential plant nutrients do fertilisers supply?

A

phosphorus

calcium

nitrogen

B

iron

nitrogen

magnesium

C

nitrogen

 potassium 

phosphorus

D

potassium

calcium

 nitrogen

    Choose your answer

    2
    1 mark

    Which compound is used as a fertiliser?

    • barium sulfate

    • ammonium sulfate

    • calcium carbonate

    • copper(II) oxide

    Choose your answer

    3
    1 mark

    Potassium nitrate, KNO3, is used as a fertiliser.

    Which of the three elements supplied by an NPK fertiliser is missing from potassium nitrate?

    • nitrogen

    • nitrogen and phosphorus

    • potassium

    • phosphorus

    Choose your answer

    4
    1 mark

    Why do farmers add NPK fertilisers to their fields?

    • to supply nitrogen, phosphorus and potassium for improved plant growth

    • to reduce the acidity of the soil

    • to kill insects that damage the crop

    • to improve the drainage of the soil

    Choose your answer

    5
    1 mark

    A fertiliser supplies nitrogen to plants.

    Which ion in the fertiliser supplies the nitrogen?

    • NO3–

    • SO42–

    • PO43–

    • K+

    Choose your answer

    1
    1 mark

    Which pair of substances would make an NPK fertiliser? 

    • ammonium phosphate and potassium chloride  

    • calcium phosphate and potassium chloride 

    • ammonium sulfate and potassium nitrate 

    • potassium nitrate and calcium carbonate 

    Choose your answer

    2
    1 mark

    Ammonia and sulfuric acid can react in the lab to make ammonium sulfate fertiliser.

    What is the formula of the product?

    • NH3SO4

    • NH4SO4

    • (NH4)2SO4

    • (NH3)2SO4

    Choose your answer

    3
    1 mark

    An NPK fertiliser supplies the elements nitrogen, phosphorus and potassium.

    Which statement correctly names the elements, from these three, that a fertiliser compound supplies?

    • Potassium sulfate supplies potassium and sulfur.

    • Ammonium nitrate supplies nitrogen and potassium.

    • Ammonium phosphate supplies nitrogen and phosphorus.

    • Potassium nitrate supplies potassium only.

    Choose your answer

    4
    1 mark

    A farmer tests the soil in a field and finds that it is short of potassium only.

    Which fertiliser should the farmer add to the field?

    • ammonium nitrate

    • ammonium phosphate

    • calcium nitrate

    • potassium chloride

    Choose your answer

    5
    1 mark

    A manufacturer needs to add potassium to a fertiliser that will be spread on acidic soil.

    The potassium compound must not react with the acid in the soil.

    Which substance should the manufacturer use?

    • potassium hydroxide

    • potassium sulfate

    • potassium oxide

    • potassium carbonate

    Choose your answer

    1
    1 mark

    Fertilisers provide three essential elements required for plant growth. 

    Which substances will make a salt that will contain two of these essential elements? 

    1   ammonia and nitric acid 

    2   potassium hydroxide and sulfuric acid 

    3   ammonia and phosphoric acid 

    4   potassium hydroxide and nitric acid 

    • 1 and 2

    • 1 and 3 

    • 2 and 4 

    • 3 and 4

    Choose your answer

    2
    1 mark

    Different fertilisers contain the essential elements needed for plant growth in varying quantities.

    Which fertiliser compound contains the highest percentage by mass of the essential elements needed for growth?

    [Relative atomic masses, Ar: H = 1; N = 14; O = 16; P = 31; S = 32; K = 39; Ca = 40]

    • (NH4)2SO4

    • NH4NO3

    • K2SO4

    • Ca3(PO4)2

    Choose your answer

    3
    1 mark

    A solid NPK fertiliser is made by mixing substances together.

    The fertiliser must have the property listed:

    • every substance in it is an ammonium salt or a nitrate

    Which substances are mixed to make the fertiliser?

    • ammonium phosphate and potassium nitrate

    • ammonium nitrate, potassium sulfate and phosphorus oxide

    • ammonium phosphate and potassium hydroxide

    • ammonium sulfate, potassium nitrate and calcium phosphate

    Choose your answer

    4
    1 mark

    Ammonium phosphate, (NH4)3PO4, is sold as a fertiliser.

    Which statements about ammonium phosphate are correct?

    1 It supplies nitrogen to plants.

    2 It supplies phosphorus to plants.

    3 It supplies potassium to plants.

    4 It is an ammonium salt.

    • 1 and 3 only

    • 3 and 4 only

    • 1, 2 and 3

    • 1, 2 and 4

    Choose your answer

    5
    1 mark

    Which compound supplies two of the three elements in an NPK fertiliser and is an ammonium salt?

    • potassium nitrate

    • ammonium phosphate

    • ammonium sulfate

    • potassium phosphate

    Choose your answer