The triad consisting of ferrous metals is

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Fe, Ni, Mn

Fe, Pt, Au

Fe, Cu, Ag

Fe, Co, Ni

answer is D.

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Detailed Solution

Triad :- Atomic weight of middle element is the arthematic mean of the first and second elements . The (Tc/’s for iron, cobalt and nickel are 768°C, 1121°C and 354°C respectively taken advantage to make magnetic and alloys so, Fe, Co, Ni typically grouped together as iron triad.

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