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GENERAL
This sub‑Chapter covers products which, although known by names (chlorides, sulphides, etc.) similar to those of the metal salts of hydracids classified in sub‑Chapter V, are actually non‑metal combinations such as :(1) A halogen with a non‑metal other than oxygen or hydrogen (halogen compounds). (2) The same compounds as under (1) above, combined with oxygen (halide oxides). or (3) Sulphur with a non‑metal other than oxygen or hydrogen (sulphur compounds).
Sulphide oxides of non‑metals (sulphur + oxygen + non‑metal) are excluded from this sub‑Chapter; they fall in heading 28.53.
Halides, halide oxides, and sulphides of metals (see the General Explanatory Note to sub‑Chapter I) or of the ammonium ion (NH4+) fall in sub‑Chapter V except in the case of compounds of precious metals (heading 28.43) and the compounds of heading 28.44, 28.45, 28.46 or 28.52.
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