7. Alcohol, phenol and ethers — Chemistry STD 12 Science — Question

Time                                 Rate (mole $litre^{-1}\,sec^{ -1}$ )

$0$                                        $2.8 \times {10^{ - 2}}$

$10$                                      $2.78 \times {10^{ - 2}}$

$20 $                                     $2.81 \times {10^{ - 2}}$

$30$                                       $2.79 \times {10^{ - 2}}$

The reaction is

$(I)$ the highest oxidation state of iron is $+ 6$ in $K_ 2FeO_4$

$(II)$ that the iron shows $+ 2$ oxidation state with six electrons in the $3d$ orbitals

$(III)$ the common oxidation state of iron is $+3$ with five unpaired electrons in $3d$ orbital

(At nos. : $L a=57, C e=58, E u=63$ and $Y b=70$ )