Chemistry 0620 · IGCSE · Physical and chemical changes

Physical and chemical changes — practice question

If limestone is heated, it produces lime (calcium oxide) and carbon dioxide. $\text{CaCO}_3(s) \rightarrow \text{CaO}(s) + \text{CO}_2(g)$ Which statement is not correct?

  • ACarbon dioxide is a greenhouse gas which may contribute to climate change.
  • BSlaked lime is used to neutralise industrial waste.
  • CThe lime can be used to treat alkaline soil.
  • DThis reaction is an example of thermal decomposition.

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