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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