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Three naturally occurring elements X,Y a...

Three naturally occurring elements X,Y and Z are good conductors of electricity and are very precious. Z is more reactive than X and Y and on exposure to air for a long time turns black. Z forms an alloy with Y and is used in jewellery and X is used as a catalyst. Identify X , Y and Z.

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Three precious elements that occur in nature are silver, gold and platinum. Silver is more reactive than gold and platinum. On exposure to air for longer time, silver turns black due to the formation of silver sulphide. Platinum is used as a catalyst. Alloy of gold with silver is used in jewellery. So, X is platinum, Y is gold and Z is silver
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