H2 & N2

Which of the following metals does not react with dilute hydrochloric acid to give hydrogen?

• Calcium

• Copper

• Iron

• Magnesium

In which tube is hydrogen formed?

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Describe a test to show that the gas produced is hydrogen.

The apparatus is used to show the reaction between zinc and steam.

Which equation represents the reaction taking place?

• Zn + H₂O → ZnO + H₂

• Zn + 2H₂O → Zn(OH)₂ + H₂

• Zn + 4H₂O → Zn(OH)₂ + 3H₂ + O₂

• 2Zn + 3H₂O → ZnO + Zn(OH)₂ + 2H₂

Which substance, present in car exhaust fumes, does not pollute the atmosphere?

• carbon monoxide

• nitrogen

• nitrogen oxides

• unburned hydroxide

Which conditions are used in the Haber process for the manufacture of ammonia?

• Pressure high, Temperature below 1000^oC

• Pressure high, Temperature above 1000^oC

• Pressure low, Temperature below 1000^oC

• Pressure low, Temperature above 1000^oC

Catalyst used for the manufacture of ammonia by the Haber process :

Pressure used for the manufacture of ammonia by the Haber process :

Temperature used for the manufacture of ammonia by the Haber process :

1. Ammonium sulphate, (NH₄)2SO₄, is sometimes added to soil to provide an element that is important for plant growth. What is this element?

• hydrogen

• nitrogen

• oxygen

• sulphur