SULPHUR

In the contact process, what are the raw materials needed for the production of sulfuric acid?

• Water, air, sulfur

• Ammonia, water, oxygen

• Crude oil, air

Which one of the three stages of the contact process is reversible?

• The burning of sulfur in oxygen to form sulfur dioxide

• The reaction of sulfur dioxide with oxygen to form sulfur trioxide

• The reaction of sulfur trioxide with water to form sulfuric acid

What is the name of the catalyst used in the contact process?

• Iron

• Nickel

• Vanadium(V) oxide

The sulfur trioxide needs to be absorbed in concentrated sulfuric acid, rather than added direct into water. Why?

• The addition to water will slow down the reaction

• The addition to water will be highly exothermic

• The addition to water will speed up the reaction

• As the temperature increases, the percentage yield decreases at a decreasing rate

• As the temperature increases, the percentage yield increases at an increasing rate

• As the temperature increases, the percentage yield decreases at an increasing rate

Which of the following is the correct symbol equation for the production of sulfur trioxide in the second stage of the contact process?

• 2SO₂(g) + O₂(g) ⇌ 2SO₃(g)

• 2SO₂(g) + O₂(g) → 2SO₃(g)

• 2S(s) + 3O₂(g) → 2SO₃(g)

Sulfuric acid acts as a dehydrating agent. What does this mean?

• It removes oxygen from a substance

• It removes water from a substance

• It removes carbon dioxide from a substance

When concentrated sulfuric acid is added to glucose, a black solid is formed over time. What is the name of the black solid?

• Copper(II) oxide

• Coal

• Carbon

What would we observe when concentrated sulfuric acid is added to hydrated copper(II) sulfate crystals?

• The blue crystals crumble and become white, steam is released

• The blue crystals crumble and become white

• The crystals will remain blue in colour

What is the exact temperature used for contact process

• 430⁰C

• 450⁰C

• 500⁰C

• 300⁰C