The furring of kettles is caused by the presence of what compound in water?

  • A calcium tetraoxosulphate (IV)
  • B calcium hydrogentrioxocarbonate (IV)
  • C calcium hydroxide
  • D calcium trioxocarbonate (IV)
jamb 2015chemistry

The correct answer is D. calcium trioxocarbonate (IV)

Calcium hydrogen carbonate, often present in temporary hard water, is boiled in a kettle to remove the hardness. In the process, a scale forms on the inside of the kettle in a process known as furring of kettles. This scale is composed of calcium carbonate.

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