Choose the incorrect statement.
- AThe $F^-$ 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 $[3Ca_3(PO_4)_2 \cdot CaF_2]$.
- BExcess nitrate in drinking water can cause diseases such as methemoglobinemia (blue baby syndrome).
- CHydrogen peroxide $(H_2O_2)$ is used for the purpose of bleaching clothes in the process of laundry.
- DNone of these
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