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Where placer deposits of platinum can be found in sea?

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Where placer deposits of platinum can be found in sea?

(a) Continental beaches

(b) Deep sea floor

(c) Ocean beaches

(d) Subsea-floor rocks

I had been asked this question during an online exam.

This intriguing question comes from Chemical From Sea topic in section Inorganic Chemical Industries of Chemical Technology

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Correct choice is (c) Ocean beaches

The explanation: Placer deposits of platinum, gold, diamonds, limonite, magnetite, zircon, and rutile are can be found in the region of ocean beaches while phosphorite, barium, sulfate etc are can be found in the region of continental beaches.

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