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Chemistry · May / June 2024 · Paper 11 · Question 5

5070Giant covalent structures

Statements about graphite and silicon(IV) oxide, SiO2, are given. Which statement is correct?

  1. ASilicon(IV) oxide is found as an impurity in iron ore.
  2. BThe angles between the atoms in silicon(IV) oxide and graphite are the same.
  3. CThe melting points of silicon(IV) oxide and graphite are high because ionic bonds are stronger than covalent bonds.
  4. DWhen graphite acts as a lubricant, the covalent bonds between the layers are broken.

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Correct answer: A. Silicon(IV) oxide is found as an impurity in iron ore.

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