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Ammonia is made industrially by the:

• 1 Contact process
• 2 Solvay process
• 3 Ostwald process
• 4 Haber process

The catalyst in the contact process is:

• 1 Iron
• 2 Vanadium(V) oxide
• 3 Nickel
• 4 Platinum on silica only

Biodegradable waste is broken down by:

• 1 Metals
• 2 Sunlight only
• 3 Microorganisms
• 4 Plastics

Catalytic converters in cars reduce emissions of:

• 1 Nitrogen
• 2 Carbon monoxide and nitrogen oxides
• 3 Oxygen
• 4 Water vapour

Eutrophication of lakes is caused by excess:

• 1 Oxygen
• 2 Nitrates and phosphates
• 3 Sodium chloride
• 4 Sunlight

The Ostwald process makes:

• 1 Soda ash
• 2 Nitric acid
• 3 Sulphuric acid
• 4 Ammonia

Ozone depletion is caused mainly by:

• 1 CFCs
• 2 Oxygen
• 3 Nitrogen
• 4 Argon

Acid rain has a pH below about:

• 1 8
• 2 9
• 3 7
• 4 5.6