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Alloy Formation

Invar, used i...

Question

Invar, used in watches, metre scales and pendulum rods, is an alloy of:

F e

and

N i

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F e

and

M n

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F e, N i

and

C

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F e

and

W

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Solution

The correct option is A $F e$ and $N i$
Invar is an alloy of iron and nickel. Invar is used in watches, meter scales and pendulum rods.

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E_{F e^{+ +} | F e}^{0} < E_{N i^{+ +} | N i}^{0}

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$[N i (C O)_{4}] > [C o (C O)_{4}]^{-} > [F e (C O)_{4}]^{2 -}$ is the correct order with respect to M-C $π$ bond. Where M=Ni, Fe, and Co

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