Choose the incorrect statement.

  • A
    The $F^-$ ion makes the enamel on teeth much harder by converting hydroxyapatite,$[3Ca_3(PO_4)_2 \cdot Ca(OH)_2]$,the enamel on the surface of the teeth,into much harder fluoroapatite $[3Ca_3(PO_4)_2 \cdot CaF_2]$.
  • B
    Excess nitrate in drinking water can cause diseases such as methemoglobinemia (blue baby syndrome).
  • C
    Hydrogen peroxide $(H_2O_2)$ is used for the purpose of bleaching clothes in the process of laundry.
  • D
    None of these

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