Bell metal is an alloy of

  • [AIPMT 1999]
  • A

    $Cu,\,Zn$ and $Sn$

  • B

    $Cu,\,Zn$ and $Ni$

  • C

    $Cu$ and $Zn$

  • D

    $Cu$ and $Sn$

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Among $Co ^{3+}, Ti ^{2+}, V ^{2+}$ and $Cr ^{2+}$ ions, one if used as a reagent cannot liberate $H _{2}$ from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is $......B.M$. (Nearest integer)

  • [JEE MAIN 2022]

Magnetic moment of $x^{n+}$ is $\sqrt {24} $ $B.M.$ Hence No. of unpaired electron and value of $'n'$ respectively. (Atomic number $= 26$)