METALS AND NON METALS

Which of these metals cannot displace hydrogen from a dilute acid? (a) iron (b) zinc (c) silver (d) calcium

Gold normally occurs in nature (a) in a free state. (b) as carbonate ore. (c) as sulphate ore. (d) as sulphide ore.

Which one of the following alloys is light and strong? (a) brass (b) stainless steel (c) duralium (d) bronze

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