Which of the following statements is incorrect?

  • A
    Corrosion of iron takes place by contact with air and water.
  • B
    The melting points and boiling points of metals are low.
  • C
    The method to convert carbonate containing ore to metal oxide is called calcination.
  • D
    The displacement of less active metals from their solution takes place by more active metal.

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Which of the following is an alloy?

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Give reasons for the following:
$(a)$ Generally,metals are not found in their free state.
$(b)$ Metals are good conductors of heat.

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Explain the following:
$(a)$ The reactivity of $Al$ decreases if it is dipped in $HNO_3$.
$(b)$ Carbon cannot reduce the oxides of $Na$ or $Mg$.

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