Invar, an alloy of $ Fe$  and $ Ni $ is used in watches and meter scale, its characteristic property is

  • A

    Small coefficient of expansion

  • B

    Resistance to corrosion

  • C

    Hardness and elasticity

  • D

    Magnetic nature

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In a titration experiment, $10 \,mL$ of an $FeCl _{2}$ solution consumed $25\, mL$ of a standard $K _{2} Cr _{2} O _{7}$ solution to reach the equivalent point. The standard $K _{2} Cr _{2} O _{7}$ solution is prepared by dissolving $1.225\, g$ of $K _{2} Cr _{2} O _{7}$ in $250 \,mL$ water. The concentration of the $FeCl _{2}$ solution is closest to $.....\, N$
[Given : molecular weight of $K _{2} Cr _{2} O _{7}=294 \,g\, mol ^{-1}$ ]

  • [KVPY 2019]