Fertilisers — Paper 1 · IGCSE Chemistry (9-1) 0971

30 Farmers use fertilisers to replace minerals in the soil that have been removed by the crops they grow. Which elements in the soil are replaced by adding fertilisers? A Ca, P, O B K, O, S C N, K, P D N, O, S

1 marks

Answer: C

This question in 0971/11 May/June 2018

31 Farmers add calcium oxide (lime) and ammonium salts to their fields. The compounds are not added at the same time because they react with each other. Which gas is produced in this reaction? A ammonia B carbon dioxide C hydrogen D nitrogen

1 marks

Answer: A

This question in 0971/12 Oct/Nov 2019

31 Which mixture contains all of the elements in a typical fertiliser? A ammonium nitrate and calcium phosphate B ammonium phosphate and potassium chloride C potassium nitrate and ammonium chloride D potassium carbonate and ammonium nitrate

1 marks

Answer: B

This question in 0971/11 May/June 2020

31 Which bag is not suitable for use as a fertiliser? A B C D ammonium potassium sodium sodium nitrate sulfate chloride phosphate NH4NO3 K2SO4 NaCl Na3PO4

1 marks

Answer: C

This question in 0971/12 May/June 2020

30 A student writes three statements about potassium nitrate, KNO3. 1 The relative formula mass of KNO3 is 101. 2 Potassium nitrate contains the three essential elements for plant growth. 3 Potassium nitrate could be used as a fertiliser. Which statements are correct? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: B

This question in 0971/11 May/June 2021

31 Fertilisers are used to provide three of the elements needed for plant growth. Which two compounds would give a fertiliser containing all three of these elements? A Ca(NO3)2 and (NH4)2SO4 B Ca(NO3)2 and (NH4)3PO4 C KNO3 and (NH4)2SO4 D KNO3 and (NH4)3PO4

1 marks

Answer: D

This question in 0971/11 May/June 2022

31 Fertilisers are used to provide three of the elements needed for plant growth. Which two compounds would give a fertiliser containing all three of these elements? A Ca(NO3)2 and (NH4)2SO4 B Ca(NO3)2 and (NH4)3PO4 C KNO3 and (NH4)2SO4 D KNO3 and (NH4)3PO4

1 marks

Answer: D

This question in 0971/12 May/June 2022

30 Ammonium nitrate, NH4NO3, is a fertiliser and is added to fields to help crops grow. Slaked lime, Ca(OH)2, is an alkali and is added to fields to reduce the acidity of the soil. Ammonium nitrate and slaked lime should not be added to a field at the same time because they react with each other to form a gas, Z. What is Z? A ammonia B hydrogen C nitrogen D oxygen

1 marks

Answer: A

This question in 0971/12 Oct/Nov 2022

30 Which pair of compounds make an NPK fertiliser? A ammonium sulfate and potassium phosphate B calcium hydroxide and ammonium nitrate C calcium phosphate and potassium chloride D potassium nitrate and ammonium sulfate

1 marks

Answer: A

This question in 0971/11 May/June 2023

30 Urea, CO(NH2)2, is used as a fertiliser. Which element that plants need for improved plant growth is provided by urea? A carbon B hydrogen C nitrogen D oxygen

1 marks

Answer: C

This question in 0971/12 May/June 2023

32 Which two compounds can be mixed together to form an NPK fertiliser? A ammonium phosphate and calcium hydroxide B calcium phosphate and ammonium nitrate C potassium nitrate and calcium oxide D potassium phosphate and ammonium nitrate

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2023

18 A farmer treats a field with calcium hydroxide to make it less acidic. When the farmer adds ammonium nitrate fertiliser to the field immediately after the calcium hydroxide, the two substances react. Why does this reaction make the fertiliser less effective? A It makes ammonia gas, so less nitrogen is absorbed by the soil. B It makes an acid, making the soil acidic again. C It makes nitrogen gas, so less nitrogen is absorbed by the soil. D It makes the fertiliser too strong, stopping the plants growing well.

1 marks

Answer: A

This question in 0971/11 May/June 2024

30 Which substance contains two elements that are found in NPK fertilisers? A ammonium chloride B calcium hydroxide C potassium nitrate D sodium phosphate

1 marks

Answer: C

This question in 0971/11 May/June 2024

31 Which compound can be added to ammonium sulfate to make an NPK fertiliser? A (NH4)3PO4 B KNO3 C K3PO4 D CO(NH2)2

1 marks

Answer: C

This question in 0971/12 May/June 2024

30 Fertilisers are used to provide the three elements needed for improved plant growth. Which two compounds would provide all three of these elements? A ammonium nitrate and calcium phosphate B ammonium nitrate and potassium sulfate C potassium nitrate and calcium phosphate D potassium phosphate and potassium sulfate

1 marks

Answer: C

This question in 0971/11 May/June 2025