Time left 1 Amalgams are highly coloured alloys alloys which contain mercury as one of the contents alloys which have great resistance to abrasion alloys which contain carbon 2 The main constituents of pearls are calcium oxide and ammonium chloride calcium carbonate and magnesium carbonate aragonite and conchiolin ammonium sulphate and sodium carbonate 3 Which of the following is not an isotope of hydrogen? Tritium Deuterium Protium Yttrium 4 Bell metal is an alloy of nickel and copper zinc and copper brass and nickel tin and copper 5 Water is a good solvent of ionic salts because it has a high specific heat it has no colour it has a high dipole moment it has a high boiling point 6 Which metal pollute the air of a big city? Copper Chromium Lead Cadmium 7 Which of the following is the lightest metal? Mercury Lithium Lead Silver 8 Which of the following does not contain a coinage metal? Silver and Gold Zinc and Gold Copper and Silver Copper and Gold
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