The fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products $\mathrm{A}$ and $\mathrm{B}$ along with the evolution of $\mathrm{CO}_2$. The sum of spin-only magnetic moment values of $A$ and $B$ is .......... $B.M.$ (Nearest integer)

(Given atomic number: $\mathrm{C}: 6, \mathrm{Na}: 11, \mathrm{O}: 8$, $\mathrm{Fe}: 26, \mathrm{Cr}: 24 \mathrm{~J}$

  • [JEE MAIN 2024]
  • A

    $5$

  • B

    $6$

  • C

    $8$

  • D

    $10$

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  • [AIPMT 1994]

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$(a)$ $V_2O_5$ $(i)$ Polyethylene
$(b)$ $TiCl_4/Al(Me)_3$ $(ii)$ Ethanal
$(c)$ $PdCl_2$ $(iii)$ $H_2SO_4$
$(d)$ Iron oxide $(iv)$ $NH_3$

  • [JEE MAIN 2019]

Which of the following ions will exhibit colour in aqueous solutions?

  • [AIPMT 2010]

Metre scales are made-up of alloy

How would you account for the following:

$(i)$ of the $d^{4}$ species, $Cr ^{2+}$ is strongly reducing while manganese $(III)$ is strongly oxidising.

$(ii)$ Cobalt $(II)$ is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised.

$(iii)$ The $d^{1}$ configuration is very unstable in ions.