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- 1. Multiple Choice
In the Haber process for the manufacture of ammonia, which of the following statements are correct?
I) The catalyst used is a transition metal.
II) Unreacted nitrogen and hydrogen are circulated back into the system.
III) Both reactants are obtained from the fractional distillation of liquefied air.
IV) The reaction is never complete and yield achieved is only about
10 – 15%
I, II and III
I, II and IV
II, III and IV
All of the above
- 2. Multiple Choice
Which statement is not correct about the Haber process?
High pressure of 250 atm is used to increase yield.
Each hydrogen molecule reacts with three nitrogen molecules to form two molecules of ammonia.
A low temperature of 450 oC is used.
The reaction is reversible.
- 3. Multiple Choice
Nitrogen and hydrogen reacts to form ammonia in the Haber process.
Which statement is correct?
A high yield of ammonia is favoured by high pressure.
A high yield of ammonia is favoured by high temperature.
A high yield of ammonia is favoured by adding catalyst.
The reaction between nitrogen and hydrogen is irreversible.
- 4. Multiple Choice
The diagram shows the manufacture of ammonia using hydrogen and nitrogen in the presence of catalyst.
What are the processes P and Q and catalyst Y?
P: cracking ; Q: fractional distillation ; Y: iron
P: cracking ; Q: fractional distillation ; Y: nickel
P: fractional distillation ; Q: cracking ; Y: iron
P: combustion ; Q: cracking ; Y: nickel
- 5. Multiple Choice
Arsine, AsH3, is a gas that behaves like ammonia.
Which ions would be produced when arsine dissolves in water?
AsH+ and H+
AsH3+ and OH−
AsH4+ and H+
AsH4+ and OH−
- 6. Multiple Choice
Some farmers use fertiliser containing ammonium nitrate and calcium carbonate.
Why is this fertilizer useful?
It provides all the essential nutrients for plant growth.
They form a compound which is not washed away by rain water.
It provides nitrogen and carbon dioxide which are required for plant growth.
It provides nitrogen for plant growth and calcium carbonate to neutralise the excess acidity of the soil.
- 7. Multiple Choice
A high yield of ammonia is favoured in the Haber process by conditions of high pressure and low temperature. However, in practice a high temperature is employed because at low temperature,
ammonia decomposes back to its original reactant.
the activation energy is too low.
the catalyst is inactive.
the reaction is too slow.
- 8. Multiple Choice
Industrial ammonia is obtained by the Haber process.
Which of the following is an incorrect statement about the process?
The hydrogen needed is obtained mainly by cracking of petroleum oil.
The reaction is endothermic and therefore a moderate temperature of 450oC is used.
High pressure favours the production of ammonia.
The industrial catalyst used is iron.
- 9. Multiple Choice
During the Haber Process, ammonia that is produced is separated from the reaction mixture by
passing the gaseous mixture through fused calcium chloride.
dissolving the other two gases.
filtering out the other two gases by passing through cotton wool.
cooling the mixture.
- 10. Open Ended
One of the essential conditions for the Haber process is a temperature of 450 oC.
Predict what will happen to the ammonia yield when the temperature is increased to 550 oC. Explain your answer. [2 marks]
- 11. Open Ended
Suggest a reason for recycling unreacted reagents in the Haber process. [1 mark]
- 12. Open Ended
In the Haber process, the percentage of ammonia present at equilibrium at different temperatures and pressures is shown in the table.
Using the table, deduce the effect of increasing the temperature on the percentage of ammonia in the equilibrium mixture. [2 marks]
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