Group 5
1.1 Give two gases required in the Haber process for the manufacture of ammonia.
1.2 State the conditions required for high yields of ammonia?
1.3.1 Write down a balanced equation for the reaction of ammonia in air.
1.4 Give three uses of ammonia.
1.5 Name the three allotropes of phosphorus.
1.6 Write down the formula for phosphoric acid and phosphonic acid. Which one is the stronger acid?
1.7 What is the highest oxidation state possible for elements from Group 5A?
1.8 Predict the formula of the product resulting from reaction of elemental forms of Mg and P. 1.9 Dinitrogen monoxide (laughing gas) can be produced by the careful decomposition of ammonium nitrate at 250 °C. Write the correct balanced equation for this reaction.
1.10 Nitric acid decomposes slowly in sunlight with nitrogen dioxide and oxygen as reduction and oxidation products, respectively. Write a balanced chemical equation for this reaction
2.1 Explain the formation of ozone layer in the stratosphere
2.2 Name the salts that cause temporary and permanent hardness in water. Name and write formula.
2.3 Use equations to explain how the temporary hardness in water can be removed.
2.6 Pure oxygen can be produced by the catalysed decomposition of potassium chlorate. What is the correct balanced chemical equation for this reaction?
2.7 Which of the following does not contain sulfur?
- Acid rain
- Egg protein
Amines - Volcanic gases
- Barite
2.8 Write a balanced chemical equation for the roasting of CuS.
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