Two complexes \left [ C{r\left ( H_{_{2}}O \right )_{6}} \right ]Cl_{3}(A)  and  \left [ C{r\left ( N_{_{}}H_{3} \right )_{6}} \right ]Cl_{3}(B)  are violet and yellow  coloured ,respectively. The incorrect statement regarding them is:

  • Option 1)

    \Delta0 values of (A) and (B) are calculated from the engergies of violet and yellow light ,respectively

  • Option 2)

    both are paramegnetic with three unpaired electrons.

  • Option 3)

    both absorb energies correponding to their complementary colors.

  • Option 4)

    \Delta0value for (A) is less than that of (B).

Answers (1)
A admin

 

Colour in coordination compounds -

The colour of the complex is complimentary to that which is absorbed

-

 

Crystal Field Theory -

According to this theory, metal and ligand are considered as point charges. This theory deals with electrostatic force of attraction means the talks about the ionic character of M-L bond. 

-as we know \Delta _{0} order is \left [ C{r\left ( H_{_{2}}O \right )_{6}} \right ]Cl_{3} < \left [ C{r\left ( N_{_{}}H_{3} \right )_{6}} \right ]Cl_{3}

\Delta _{0} order will be compaired by spectro chemical series not by energies of viloet and yellow light

\left [ C{r\left ( H_{_{2}}O \right )_{6}} \right ]Cl_{3} \rightarrow Cr^{3+}and H_{2}O is WFL

Cr^{3+}\rightarrow fig

\left [ C{r\left ( N_{_{}}H_{3} \right )_{6}} \right ]Cl_{3}\rightarrow Cr^{3+}and NH_{3} is WFL

\ Cr^{3+}  fig

in d^{3} configuration thethe number of unpaired electrons remain 3

 


Option 1)

\Delta0 values of (A) and (B) are calculated from the engergies of violet and yellow light ,respectively

Option 2)

both are paramegnetic with three unpaired electrons.

Option 3)

both absorb energies correponding to their complementary colors.

Option 4)

\Delta0value for (A) is less than that of (B).

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