28051200

Calcium

28051900

Other

28053000

Rare-earth metals, scandium and yttrium whether or not intermixed or interalloyed

28054000

Mercury

2806

Hydrogen chloride (hydrochloric acid); chlorosulphuric acid.

28061000

Hydrogen chloride (hydrochloric acid)

28062000

Chlorosulphuric acid

28070000

Sulphuric acid; oleum.

28080000

Nitric acid; sulphonitric acids.

2809

Diphosphorous pentaoxide; phosphoric acid; polyphosphoric acids, whether or not chemically defined.

28091000

 Diphosphorus pentaoxide

280920

 Phosphoric acid and polyphosphoric acids: