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Classify the following substances as elements, compounds or mixtures:
(i) Sodium, (ii) Hydrogen, (iii) Brass, (iv) Carbon dioxide, (v) Gun powder, (vi) Soda water, (vii) Water, (viii) Chlorine, (ix) Air, (x) Common salt, (xi) Stainless steel, (xii) Iron filings, (xiii) Oxygen, (xiv) Milk, (xv) Blood, (xvi) Ammonia, (xvii) Glass, (xviii) Marble, (xix) Emulsion, (xx) Wood.
