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Uses of Metalloids

The internati...

Question

The international standards of weight and measures are made of:

A

gold silver alloys

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B

platinum - iridium alloys

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C

copper - gold alloys

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D

platinum - iron alloys

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Solution

The correct option is B platinum - iridium alloys
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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