Q.1
On heating, limestone breaks down into calcium oxide and carbon dioxide. What is the name of this type of reaction?
  • Neutralisation
  • Combustion
  • Thermal decomposition
  • Reduction
Q.2
In the presence of carbon dioxide, what happens to limewater?
  • It turns brown
  • It turns cloudy
  • It decolourises
  • It goes brick red
Q.3
Calcium hydroxide dissolves in water to produce what?
  • Limewater
  • Quicklime
  • Slaked lime
  • Limestone
Q.4
The chemical name for the main mineral that is found in limestone is...
  • calcium carbide
  • calcium carbonate
  • sodium carbonate
  • sodium chloride
Q.5
When calcium hydroxide is reacted with carbon dioxide, the substances produced are...
  • Calcium oxide and oxygen
  • Calcium sulfate and water
  • Calcium carbonate and oxygen
  • Calcium carbonate and water
Q.6
Limestone is badly affected by acid rain. Choose the equation below that describes this reaction.
  • CaCO3 + H2SO4 → CaSO4 + CO2 + O2
  • CaCO3 + H2SO4 → CaSO4 + CO2 + H2O
  • CaO + H2SO4 → CaSO4 + H2O
  • CaCO3 + H2SO4 → CaSO3 + CO2
Q.7
Calcium oxide reacts with what to form calcium hydroxide?
  • Hydrogen
  • Carbon dioxide
  • Water
  • Oxygen
Q.8
Which gas is given off when calcium carbonate is heated strongly?
  • Carbon dioxide
  • Nitrogen
  • Water vapour
  • Oxygen
Q.9
We can use limewater to test for the presence of which gas?
  • Carbon dioxide
  • Oxygen
  • Methane
  • Nitrogen
Q.10
Choose the correct equation for the reaction that produces slaked lime (calcium hydroxide).
  • CaO + H2O → CaOH
  • CaO + H2O → Ca(OH)3
  • CaCO3 + O2 → CaO
  • CaO + H2O → Ca(OH)2
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