Fertilisers

Fertilisers are applied to supply the three elements required to raise crop yield. Which two compounds would supply all three of these elements?

Feb/March 2016

Fertilisers are used to supply the three elements needed to raise the yield of crops. Which two compounds would supply all three of these elements?

Feb/March 2016

This question concerns compounds of nitrogen.

Feb/March 2016

Which two compounds would be used to make an NPK fertiliser?

Feb/March 2018

Which two compounds would be used to produce an NPK fertiliser?

Feb/March 2018

A farmer applies calcium hydroxide to a field in order to reduce its acidity. If the farmer then puts ammonium nitrate fertiliser onto the same field straight after the calcium hydroxide, the two substances react. Why does this reaction reduce the effectiveness of the fertiliser?

Feb/March 2019

The raw materials used in the Haber process are hydrogen and nitrogen. From what sources are the hydrogen and nitrogen obtained?

Feb/March 2019

Fertilisers are blends of various compounds that are used to promote crop growth. Which pair of substances includes the three essential elements needed for plant growth?

Feb/March 2020

Fertilisers are blends of various compounds that are used to boost crop growth. Which pair of substances contains the three essential elements needed for plant growth?

Feb/March 2020

Which pair of chemical compounds could be used to make the fertiliser shown?

Feb/March 2021

Which pair of chemical compounds could be used to make the fertiliser shown?

Feb/March 2021

The formulae for four compounds, W, X, Y and Z, are listed below. W: $\text{FeSO}_4$ X: $\text{(NH}_4)_3\text{PO}_4$ Y: $\text{KNO}_3$ Z: $\text{NaCl}$ Which of these compounds should be combined to make a fertiliser that provides the three elements needed for better plant growth?

Feb/March 2023

Ammonium sulfate is used as a fertiliser. It is produced from ammonia and sulfuric acid. The ......1...... is produced by the ......2...... process, in which ......3...... is used as a catalyst. Which words fill gaps 1, 2 and 3?

Feb/March 2023

Which chemicals may be used as a fertiliser to supply the three elements required for better plant growth?

Feb/March 2024

A fertiliser sample is examined by heating it with aqueous sodium hydroxide. A colourless gas forms and turns damp red litmus paper blue. Which element, needed for plant growth, must be present?

Feb/March 2025

A river water sample contains a high nitrate concentration from fertilisers. Which of the following statements about this river water are correct?

Feb/March 2025

The soil on a farm contains very little nitrogen (N) and phosphorus (P). Which fertiliser would raise the quality of this soil most effectively?

May/June 2016

Which compound is not employed as a fertiliser?

May/June 2016

The formulae for four compounds, W, X, Y and Z, are shown. Which combination of compounds forms a complete fertiliser?

May/June 2016

The soil on a farm has extremely low levels of both nitrogen (N) and phosphorus (P). Which fertiliser would be the most effective choice for improving the soil’s quality?

May/June 2016

Which row identifies the catalyst used in the Haber process and the origins of the raw materials?

May/June 2017

Farmers apply fertilisers to replenish minerals in the soil that are taken up by the crops they cultivate. Which elements in the soil are restored by the use of fertilisers?

May/June 2018

Fertilisers are often made up of mixtures of solid compounds. Which compounds could be combined to supply the three elements required for healthy plant growth?

May/June 2018

Ammonia is produced by combining hydrogen with nitrogen in the Haber process. Which row gives the origins of hydrogen and nitrogen and the conditions employed in the production of ammonia by the Haber process?

May/June 2018

Which natural resource is unable to supply a raw material for the manufacture of ammonia?

May/June 2021

Fertilisers supply three of the elements required for plant growth. Which two compounds would make a fertiliser that contains all three of these elements?

May/June 2022

Fertilisers are used to supply three of the elements needed for plant growth. Which two compounds could be combined to produce a fertiliser containing all three of these elements?

May/June 2022

Fertilisers are used to supply three of the elements required for plant growth. Which two compounds would produce a fertiliser that contains all three of these elements?

May/June 2022

Fertilisers are added to supply three of the elements needed for plant growth. Which two compounds would produce a fertiliser that contains all three of these elements?

May/June 2022

Fertilisers supply three elements required for plant growth. Which pair of compounds would produce a fertiliser that contains all three of these elements?

May/June 2022

Fertilisers supply three elements required for plant growth. Which two compounds could be combined to make a fertiliser that contains all three of these elements?

May/June 2022

Which two compounds are used to produce an NPK fertiliser?

May/June 2023

Urea, $\text{CO(NH}_2\text{)}_2$, is used as a fertiliser. Which element that plants require for improved growth is supplied by urea?

May/June 2023

What substance do farmers use to improve plant growth?

May/June 2023

Which compound can be mixed with ammonium sulfate to produce an NPK fertiliser?

May/June 2024

A farmer is aware that his soil requires phosphorus and potassium. He can choose from four fertilisers: 1 $\text{NH}_4\text{NO}_3$; 2 $(\text{NH}_4)_3\text{PO}_4$; 3 $\text{KNO}_3$; 4 $(\text{NH}_2)_2\text{CO}$. Which fertilisers ought he to use?

May/June 2024

Which pollutant causes the deoxygenation of water in ponds and lakes?

May/June 2024

Fertilisers are used to supply the three elements required for better plant growth. Which two compounds could provide all three of these elements?

May/June 2025

Farmers add fertilisers to replenish the soil with the elements removed by the crops they grow. Which elements in the soil are replenished when fertilisers are added?

May/June 2025

Nitrogen, phosphorus and potassium are necessary elements for better plant growth. Which mixture supplies all three necessary elements?

May/June 2025

This question concerns nitrogen and its compounds. Nitrogen exists as molecules with the formula N$_2$.

May/June 2025

Calcium oxide and ammonium salts are used by farmers to improve soils. Why are these two substances applied at separate times?

Oct/Nov 2016

Ammonia is produced by the Haber process. $\text{N}_2 + 3\text{H}_2 \rightleftharpoons 2\text{NH}_3$ What are the sources of the nitrogen and hydrogen used in the Haber process?

Oct/Nov 2017

Which metal acts as the catalyst in the Haber process used to manufacture ammonia?

Oct/Nov 2017

Which compound would not be used as an essential component of a garden fertiliser?

Oct/Nov 2018

Which compound would not be used as a major ingredient in a garden fertiliser?

Oct/Nov 2018

Which compound would not be used as a main component of a garden fertiliser?

Oct/Nov 2018

Ammonia is produced using the Haber process from nitrogen and hydrogen. Which row states the principal sources of these two gases?

Oct/Nov 2018

The diagrams illustrate the structures of four substances: R, S, T and U.

Oct/Nov 2018

There are four fertilisers, and each one is packaged in $100\,\text{kg}$ bags. Which fertiliser provides the largest mass of nitrogen in each $100\,\text{kg}$ bag?

Oct/Nov 2019

Ammonium sulfate is used as a fertiliser. It is produced from ammonia and sulfuric acid. Which words should be placed in gaps 1, 2 and 3? The .....1..... is produced by the .....2..... process, in which .....3..... is used as a catalyst.

Oct/Nov 2019

Ammonium sulfate is employed as a fertiliser. It is produced from ammonia and sulfuric acid. Which words should fill gaps 1, 2 and 3? The ......1...... is produced by the ......2...... process in which ......3...... is used as a catalyst.

Oct/Nov 2019

This question concerns ammonia.

Oct/Nov 2019

Ammonia is a significant chemical substance.

Oct/Nov 2019

Which of the following statements about fertilisers is correct?

Oct/Nov 2021

What process is used to make hydrogen for the Haber process?

Oct/Nov 2021

A farmer has four different compounds used in fertilisers. Which two compounds are combined to produce an NPK fertiliser?

Oct/Nov 2022

This question concerns compounds of nitrogen and fertilisers.

Oct/Nov 2022

Which combination of salts makes an NPK fertiliser?

Oct/Nov 2023

Which pair of compounds can be combined to make an NPK fertiliser?

Oct/Nov 2023

This question deals with nitrogen and several of its compounds.

Oct/Nov 2023

Fertilisers are blends of several compounds that are used to promote crop growth. Which two substances include the three essential elements needed for plant growth?

Oct/Nov 2024

Which mixture includes every element present in a typical NPK fertiliser?

Oct/Nov 2024

A fertiliser includes ammonium nitrate and potassium phosphate. Why can this fertiliser be called an NPK fertiliser?

Oct/Nov 2024

NPK fertilisers are blends of salts that are used to enhance plant growth. Which salt could be used as one ingredient in an NPK fertiliser?

Oct/Nov 2025

Which statement comparing the conditions employed in the Haber process and in the Contact process is correct?

Oct/Nov 2025