Which are the three most important elements provided by artificial fertilisers?
Carbon, nitrogen and oxygen
Phosphorus, sulfur and hydrogen
Nitrogen, phosphorus and potassium
Which of the following is not a nitrogenous fertiliser?
Calcium carbonate
Urea
Ammonium sulfate
Which acid reacts with ammonia to form ammonium nitrate fertiliser?
Nitric acid
Hydrochloric acid
Sulfuric acid
What are the raw materials needed to make ammonia?
Air and water
Natural gas and water
Air, natural gas and water
Which raw material is needed to make sulfuric acid, but not to make ammonia?
Air
Water
Sulfur
Which statement about the production of ammonium sulfate fertiliser is correct?
The laboratory method is a large-scale batch process
The industrial method is a large-scale continuous process
The industrial method is a large-scale batch process
What catalyst is used in the Haber process?
Manganese dioxide
Iron
Vanadium(V) oxide
Hydrogen reacts with chlorine to form hydrogen chloride: H2(g) + Cl2(g) 2HCl(g) ⇌ Which statement about this reaction is correct?
The equilibrium position moves to the right if the pressure is increased
The equilibrium position moves to the left if the pressure is increased
The time taken to reach equilibrium is decreased if the pressure is increased
What happens to a reversible reaction in a closed system when a catalyst is added? - Higher
The equilibrium position moves to the right, increasing the equilibrium yield of product
The time taken to reach equilibrium increases
The time taken to reach equilibrium decreases
Why is 450 °C chosen for the Haber process and Contact process? - Higher
The forward reactions are endothermic, so this ensures high equilibrium yields of product
The forward reaction are exothermic, but low temperatures give low rates of reaction
The backward reactions are exothermic, so this ensures high equilibrium yields of product