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Industrial and environmental chemistry
5 Class 12 Chemistry questions with answers and explanations.
Printable worksheet with answer key
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Ammonia is made industrially by the:
- 1 Contact process
- 2 Solvay process
- 3 Ostwald process
- 4 Haber process
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Correct answer: Haber process
Nitrogen and hydrogen react over an iron catalyst.
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The catalyst in the contact process is:
- 1 Iron
- 2 Vanadium(V) oxide
- 3 Nickel
- 4 Platinum on silica only
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Biodegradable waste is broken down by:
- 1 Metals
- 2 Sunlight only
- 3 Microorganisms
- 4 Plastics
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Catalytic converters in cars reduce emissions of:
- 1 Nitrogen
- 2 Carbon monoxide and nitrogen oxides
- 3 Oxygen
- 4 Water vapour
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Correct answer: Carbon monoxide and nitrogen oxides
They convert harmful gases to CO2 and N2.
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Eutrophication of lakes is caused by excess:
- 1 Oxygen
- 2 Nitrates and phosphates
- 3 Sodium chloride
- 4 Sunlight
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Correct answer: Nitrates and phosphates
Fertiliser run off feeds algae and depletes oxygen.