Among the following the hardest metal is – (1) Gold (2) Iron (3) Platinum (4) Tungsten

Among the following the hardest metal is – (1) Gold (2) Iron (3) Platinum (4) Tungsten
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(4) Tungsten Explanation: Titanium is the hardest natural metal in the world. It is very strong, three times the strength of steel and much stronger than gold, silver and platinum and yet is very light weight. Tungsten carbide is the hardest metal alloy on Earth and is scratch proof under normal wear. Tungsten carbide is two times as hard as steel and four times as hard as titanium.
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