Explanatory notes
… (4) Tin phosphide . A very brittle silvery‑white solid. Used in making alloys. (5) Other phosphides , e.g., … Natural water, even if filtered, sterilised, purified or softened, is excluded ( heading 22.01 ). When put up as a … by water, used in organic synthesis. (3) Alkali amides . Sodamide or sodium amide (NaNH 2 ) is obtained by the action …