The international standards of weight and measures are made of:
gold silver alloys
platinum - iridium alloys
copper - gold alloys
platinum - iron alloys
A
platinum - iridium alloys
B
copper - gold alloys
C
platinum - iron alloys
D
gold silver alloys
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Solution
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The addition of 10% iridium to the platinum greatly increases its hardness and so reduces wear.Hence the international standards of weight and measures are made up of platinum and iridium alloys.
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