The correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co 3 + is:

Question

Aicharya · Accepted Answer

The order of the ligand in the spectrochemical series

H_{2} O < {NH}_{3} < en

Absorbed wavelength

∝ \frac{1}{Absorbed energy}

Thus, the order of observed energy is:

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

Hence, the wavelength absorbed will be in the opposite order i.e.,

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

.

The correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co…