Chemistry Quiz on Ammonia

Which substance can be used as a nitrogen fertiliser?

• N_2

• NO_2

• HNO_3

• NaNO_3

What is the source of the hydrogen used to manufacture ammonia in the Haber Process?

• air

• sulfuric acid

• petroleum

• water

Which fertilizer contains the greatest percentage by mass of nitrogen?

• NH4NO3

• NaNO3

• (NH4)2SO4

• (NH4)3PO4

Which fertilizer contains the greatest mass of nitrogen per mole?

• NH4NO3

• NaNO3

• (NH4)2SO4

• (NH4)3PO4

Nitrogen fertilisers can cause pollution of tap water because water treatment plants have difficulty in removing substance X from water. What is X?

• ammonia

• ammonium

• nitrate

• sulfate

Which compound will eliminate acid in the soil but does not react with ammonium fertilisers?

• calcium carbonate

• calcium hydroxide

• calcium nitrate

• calcium oxide

Which statement about the properties of ammonia is correct?

• It dissolves in water to form an acidic solution.

• It decomposes on heating to a high temperature to form nitrogen and hydrogen.

• It is formed by heating ammonium salts with sulfuric acid

• It reacts with alkali to form salts.

An ‘NPK’ fertiliser is made by mixing together one mole of each of three different compounds. In which mixture will there be equal numbers of atoms of nitrogen, phosphorous and potassium?

• (NH4)3PO4 K2HPO4 K2SO4

• NH4NO3 Na3PO4 KNO3

• (NH4)2SO4 NaH2PO4 KCl

• (NH4)2SO4 Ca3(PO4)2 K2SO4

Ammonia is produced by the reaction of the elements hydrogen and nitrogen in the Haber process.

One of these elements is obtained from crude oil. The ammonia formed can be reacted with substance Q to form a salt. Ammonia can be displaced from this salt by reacting with substance R.

Which row correctly shows the element obtained from crude oil and the types of substances corresponding to Q and R?

• A

• B

• C

• D

The flow diagram shows how a salt used as a nitrogen fertiliser can be made starting from three elements, X, Y and Z. What could be X, Y and Z?

• A

• B

• C

• D