Which metal or alloy is considered to be the backbone of manufacturing industries?

Iron

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Aluminium

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Manganese

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Steel

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Solution

The correct option is D Steel
Steel is needed to manufacture a variety of engineering goods, construction material, defence, medical, telephonic, scientific equipment and a variety of consumer goods.
Steel, composed simply of iron and carbon, accounts for 90% of steel production. Low alloy steel is alloyed with other elements, usually molybdenum, manganese, chromium, or nickel, in amounts of up to 10% by weight to improve the hardenability of thick sections.

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