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Kalahira
Answer: Iron triad are used in the process to create steel and other metal mixtures. Coinage Metals are used for much more than just coins, and many other elements besides these are made into coins.

Iron triad is Iron , cobalt and nickel

the use of this iron triad is it is used as alloy as steel.

coinage metal is copper, silver and gold : in them all metals are transition metals and all are less reactive

coinage metals are used in jewellary (silver and gold)

copper is used in wiring of electricity.

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