Fertilisers

Farmers make use of some calcium compounds.

May/June 2015

The diagram illustrates a flow chart for producing fertiliser. In the flow chart, what are W, X, Y and Z?

May/June 2016

The diagram illustrates a flow chart for producing fertiliser. In the flow chart, what do W, X, Y and Z represent?

May/June 2016

Which ion is found in both sewage and fertilisers and may lead to eutrophication when it gets into rivers?

May/June 2016

Which of these uses of sulfuric acid are correct? 1 used as a bleach in the manufacture of wood pulp for paper 2 used as a food preservative in tinned foods 3 used as a raw material in the manufacture of detergents 4 used as a fertiliser

May/June 2019

Ammonia, NH$_3$, is used in the manufacture of nitrogenous fertilisers.

May/June 2022

Nitric acid, HNO$_3$, is used in the manufacture of fertilisers.

May/June 2022

The flow chart illustrates several of the processes and reactions involved in the production of ammonia. What are the names of process X, substance 1 and substance 2?

May/June 2024

NPK fertilisers are applied to promote plant growth. A solid NPK fertiliser is described by these properties: • soluble in water • forms an aqueous solution with pH $7$ Which substances are combined to produce a solid NPK fertiliser?

May/June 2024

In the Haber process, hydrogen and nitrogen combine to produce ammonia in the presence of a catalyst. Which reactant is separated by fractional distillation, and what catalyst is used in the Haber process?

May/June 2024

Ammonium nitrate, $\text{NH}_4\text{NO}_3$, is a synthetic fertiliser made from ammonia. What is one benefit of using ammonium nitrate as a fertiliser?

Oct/Nov 2015

Which compound is employed as a fertiliser?

Oct/Nov 2016

Nitrogenous fertilisers may lead to eutrophication in rivers. The stages of eutrophication are given below. 1 The fertiliser is washed into the river. 2 Oxygen levels become depleted in the river. 3 Plants die. 4 Plants begin to decay. 5 Plants in the river grow at an increased rate. What is the correct sequence of these five stages in eutrophication?

Oct/Nov 2017

Concentrated aqueous ammonia is used in the manufacture of fertilisers such as ammonium phosphate, $(\text{NH}_4)_3\text{PO}_4$.

Oct/Nov 2017

Fertilisers contain potassium nitrate, potassium sulfate and potassium phosphate.

Oct/Nov 2017

The diagram illustrates the principal stages in producing an ammonia-based fertiliser. What is occurring in the process marked X?

Oct/Nov 2018

Lakes contain different dissolved substances. Which substance causes eutrophication in lakes?

Oct/Nov 2018

Which fertiliser has the greatest percentage of nitrogen by mass?

Oct/Nov 2018

Which statement explains why ammonium sulfate can be used as a fertiliser?

Oct/Nov 2019

Certain compounds that contain nitrogen are used as fertilisers. The table lists some compounds containing nitrogen, whether or not they are used as fertilisers and a reason for each. Which row is correct?

Oct/Nov 2020

State where the hydrogen and nitrogen used to manufacture ammonia by the Haber process come from.

Oct/Nov 2021

A river flows through land used for cotton growing. The cotton farmers applied a large quantity of fertiliser to their fields. This led to eutrophication in the river water. Which option is correct?

Oct/Nov 2022

This question concerns ammonia and ammonium salts.

Oct/Nov 2022

This item concerns ammonium sulfate, $(\text{NH}_4)_2\text{SO}_4$.

Oct/Nov 2022

Which row shows one benefit and one drawback of fertilisers?

Oct/Nov 2024

Which statements concerning the Haber process used to manufacture ammonia are correct?

Oct/Nov 2025