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This is because metals like platinum,gold and silver are noble metals,they do not easily mix with impurities such as silica,potassium etc. And even if they do mix it can be easily separated by adding a acid to it. Hence, these metals are present in free state.
ANSWER: Platinum and gold have high negative values of oxidation potentials. They do not possess tendency to form positive ions at all. Therefore, they do not occur in combined state unlike other metals and hence, they occur free in nature.
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