Exercise 5 please help

> G O File Sign in Compleos Forcie ks.pdf D/Onc%20Drive/OneDrive 20%20Hanoi%20University220of%20Science20and%20Technology/Desktop/2021%204/HHDC/Complex%20Excrcies_KOS.pdf 3 D Page www A Read aloud C. LU mga and Tow spm 1 aft Add text Draw Highlight Frase 3. The [Co(NH3)63+] ion is diamagnetic but [Fe(H20)62+] is paramagnetic. Explain? 4. Consider the complex ions [Co(NH3)63"], [Co(CN)63-] and [CoF63-). The wavelengths of absorbed radiation for these compounds are in no specific order) 770 nm, 440 nm and 290nm. Match the complex ion to the wavelength of absorbed radiation 5. Complex ion [Cu(NH3)4]2+ 1M. This complex decomposes in acidic medium via the following reaction: [Cu(NH3)4]2+ + 4H+ = Cu2+ + 4NH4" Calculate pH of the solution at which 99.9% complex was decomposed. Know K= 1012 and Ka(NH4)= 109.2 6. Why does the low- spin complex [Co(NH3)6]3+ appear color. Explain based on splitting energy A= 22.900 cm-(1cm-1=11.962 J.mol!) 7. Compound of copper (II) are generally colored, but compounds of copper (I) are not. Explain. Would you expect [Cd(NH3)4]Cl2 to be color? Explain. HOO!! A6 40 ENG 10:41 PM