O level Chemistry Ammonia (10 qns)

Ammonia gas is produced industrially by the Haber process. Which of the following statements is not true with regard to the Haber process?

• Nitrogen is obtained from the air

• A catalyst is added to increase the yield of ammonia

• High pressure is applied to increase the yield of ammonia

• High pressure is applied to overcome the activation energy

In the Haber process, nitrogen and hydrogen react to form ammonia. Which is the main source of hydrogen?

• air

• crude oil

• ethanoic acid

• ethanol

Which of the following pairs of compounds react together to produce ammonia?

• solid calcium nitrate, solid lead(II) hydroxide and aluminium foil

• solid calcium nitrate, aqueous sodium hydroxide and aluminium foil

• solid ammonium sulfate and aqueous calcium hydroxide

• solid ammonium sulfate and aqueous calcium nitrate

Compounds X and Y react to form a gas according to the following equation:

X(g) + Y(g) → Z(g)

Which of the following energy profile diagrams show the reaction being slowest and has the poorest yield?

• 

• 

• 

• 

Which statement about the manufacture of ammonia via the Haber Process is not correct?

• A high pressure will increase the yield of ammonia

• A high temperature will increase the yield of ammonia

• An iron catalyst is used to speed up the rate of reaction

• It is a redox reaction

The diagram shows the fractional distillation of petroleum. Which statements about fractions X and Y are correct?

• X is more flammable than Y

• X burns with a less sooty flame than Y

• X is more viscous than Y

Nitrogenous fertiliser such as ammonium nitrate is used to increase crop yield. Which substance can be added to increase the pH of acidic soil containing ammonium nitrate without causing a loss of nitrogen?

• calcium carbonate

• calcium hydroxide

• magnesium hydroxide

• potassium hydroxide

From which of the connecting pipes would a major leak result in the highest increase in the pH of the rain?

• pipe A

• pipe B

• pipe C

• pipe D

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?

• Process P: cracking

  Process Q fractional distillation

• Process P: fractional distillation

  Process Q: cracking

• Catalyst Y: iron

• Catalyst Y: nickel

The Haber process is a reversible reaction as some of the ammonia formed is unstable as it decomposes readily back into its reactants. How is this prevented?

• Adding water to dissolve ammonia

• Cooling the misture to liquefy ammonia

• Filter the mixture to remove ammonia

• Fractional distil the mixture to separate ammonia gas