Chemistry - Environmental Chemistry Question with Solution | TestHub

Statement (B) is incorrect because catalytic converters are coated with precious metals like platinum (Pt), palladium (Pd), and rhodium (Rh), not gold, silver, or copper.

Statement (D) is incorrect because fluoride ions ($F^{-}$) convert hydroxyapatite into fluoroapatite, which makes tooth enamel harder and more acid-resistant rather than softer.

Statements (A) and (C) are correct environmental science facts.