Correct increasing order for the wavelengths of absorption in the visible region for the complexes of is [2017]

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Q.
Correct increasing order for the wavelengths of absorption in the visible region for the complexes of ${Co}^{3 +}$ is [2017]

1 ${[Co {(H_{2} O)}_{6}]}^{3 +}, {[Co {(en)}_{3}]}^{3 +}, {[Co {({NH}_{3})}_{6}]}^{3 +}$

2 ${[Co {(H_{2} O)}_{6}]}^{3 +}, {[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co {(en)}_{3}]}^{3 +}$

3 ${[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co {(en)}_{3}]}^{3 +}, {[Co {(H_{2} O)}_{6}]}^{3 +}$

4 ${[Co {(en)}_{3}]}^{3 +}, {[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co {(H_{2} O)}_{6}]}^{3 +}$

Ans.
(4)

Increasing order of crystal field splitting energy is:

$H_{2} O < {NH}_{3} < e n$

Thus, increasing order of crystal field splitting energy for the given complexes is:

${[Co {(H_{2} O)}_{6}]}^{3 +} < {[Co {({NH}_{3})}_{6}]}^{3 +} < {[Co {(en)}_{3}]}^{3 +}$

As, $E = \frac{h c}{λ}$

Thus, increasing order of wavelength of absorption is:

${[Co {(en)}_{3}]}^{3 +} < {[Co {({NH}_{3})}_{6}]}^{3 +} < {[Co {(H_{2} O)}_{6}]}^{3 +}$

Solution

Q.
Correct increasing order for the wavelengths of absorption in the visible region for the complexes of ${Co}^{3 +}$ is [2017]

1 ${[Co {(H_{2} O)}_{6}]}^{3 +}, {[Co {(en)}_{3}]}^{3 +}, {[Co {({NH}_{3})}_{6}]}^{3 +}$

2 ${[Co {(H_{2} O)}_{6}]}^{3 +}, {[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co {(en)}_{3}]}^{3 +}$

3 ${[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co {(en)}_{3}]}^{3 +}, {[Co {(H_{2} O)}_{6}]}^{3 +}$

4 ${[Co {(en)}_{3}]}^{3 +}, {[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co {(H_{2} O)}_{6}]}^{3 +}$

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Solution

Q. Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co3+ is [2017]

1 [Co(H2O)6]3+,[Co(en)3]3+,[Co(NH3)6]3+

2 [Co(H2O)6]3+,[Co(NH3)6]3+,[Co(en)3]3+

3 [Co(NH3)6]3+,[Co(en)3]3+,[Co(H2O)6]3+

4 [Co(en)3]3+,[Co(NH3)6]3+,[Co(H2O)6]3+

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Q.
Correct increasing order for the wavelengths of absorption in the visible region for the complexes of ${Co}^{3 +}$ is [2017]

1 ${[Co {(H_{2} O)}_{6}]}^{3 +}, {[Co {(en)}_{3}]}^{3 +}, {[Co {({NH}_{3})}_{6}]}^{3 +}$

2 ${[Co {(H_{2} O)}_{6}]}^{3 +}, {[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co {(en)}_{3}]}^{3 +}$

3 ${[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co {(en)}_{3}]}^{3 +}, {[Co {(H_{2} O)}_{6}]}^{3 +}$

4 ${[Co {(en)}_{3}]}^{3 +}, {[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co {(H_{2} O)}_{6}]}^{3 +}$