Which is not true about the Haber process for making ammonia?
Platinum is used as a catalyst
The process is carried out at a temperature of about 450 oC
The process takes place at a pressure of about 200 atmospheres
Natural gas is a raw material
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What does the graph show about the effect of pressure and temperature on the Haber process?
Less ammonia is produced at higher pressures
The yield of ammonia decreases with increased temperature
The optimum conditions are low pressure and high temperature
At 500 atmospheres and 400 oC the yield of ammonia is 45%
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1 markWhat is the atom economy of the Haber process?
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2NH3
Relative atomic masses (Ar): H = 1 N = 14
82.3%
17.6%
25.0%
100%
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What essential plant nutrients do fertilisers supply?
| A | phosphorus | calcium | nitrogen |
| B | iron | nitrogen | magnesium |
| C | nitrogen | potassium | phosphorus |
| D | potassium | calcium | nitrogen |
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Which is not true about phosphate-containing rock?
It can be applied directly to the ground
It reacts with nitric acid to produce phosphoric acid and calcium nitrate
It reacts with sulfuric acid to produce single superphosphate
It reacts with phosphoric acid to produce calcium phosphate
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Ammonia and sulfuric acid can react in the lab to make ammonium sulfate fertiliser.
What is the formula of the product?
NH3SO4
NH4SO4
(NH4)2SO4
(NH3)2SO4
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