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Explain the difference in nephelauxetic effect of the Racah parameter (B) for [Co(CN)6]3- = 460 cm-1 and [Co(NH3)6]3+= 615 cm-1.
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- Give the formula of each of the following coordination entities :(i) Co3+ ion is bound to one Cl–, one NH3 molecule and two bidentate ethylene diamine (en) molecules.(ii) Ni2+ ion is bound to two water molecules and two oxalate ions.Write the name and magnetic behaviour of each of the above coordination entities.(At nos. Co = 27, Ni = 28)What's the LFSE (in terms of Δo or ΔT and P) and estimate the spin-only contribution to the magnetic moment for [Fe(CN)6]3-? Please write legibly.(i) The detection of Mn by graphite furnace atomic absorption spectrometry (GFAAS) is sensitive to the presence of aluminium ions Al3+ which may form refractory compounds such as MnAl2O4. Comment on the possible impact of this compound on the measurements and what action may be taken to minimize this. (ii) Write a brief note on the best practice for the preparation of a calibration curve. (iii) Atomic absorption spectroscopy (AAS) is a powerful technique for the analysis of trace amounts of metals. Describe the two common atomic absorption methods used in the lab with reference to their comparative strengths and weaknesses.
- What is the main origin of difference in the magnetic properties of lanthanides and transition elements?K2Cr2O7 + 7H2C2O4·2H2O → 2K(Cr(C2O4)2(H2O)2) + 6CO2 + 17H2O Calculate theoretical yield of: K[Cr(C204)2(H20)2] · 2H2O (3 g of oxalic acid dihydrate (H2C2O4·2H2O) )(1 g of potassium dichromate (K2Cr2O7) )(20 mL of 95% ethanol)(b) The formula that relates the spin only magnetic moment (en) to the number of unpaired d-electrons (x) is: Heft = √√x(x+2) (1) For each of the following complexes, use this formula to calculate the number of unpaired electrons: Nan[Rh(CO)4], Hell0 BM Rb₂lMoBrn), Heft=2.83 BM (ii) Using the answers from part (b)(i): • Draw crystal field d-orbital energy level diagrams for each complex. • State the oxidation state of the metal in each complex. • Determine the value of n for each complex.
- Provide brief well focused responses to the following questions. Why is Δo for the [Cr(CN)6]3- anion very much larger than Δo for [CrCl6]3-? Qualitatively compare the expected μeff (298K) values for the octahedral complex anions [CrCl6]3- and [Cr(CN)6]3- .When compared to that of the free thiourea, the vibrational frequency of carbon-sulfur bond in (Cu(tu)3]^+ complex is: 1 a. lower b. the same c. none of these d. higher If the molar susceptibility of the unpaired electrons of the polar complex Ni(PPH3)2C12 was found to be 3.4 x 10-3 c.g.s. at 25 C. Then the molecular geometry of this complex is: 2 a. Tetrahedral b. trans-Square planar c. trans-Octahedral d. cis-Square planar The complexes you prepared in optical isomerism experiment are: a. [Co(NH3)6]C13 and [Co(NH3)3(NO2)3] b. Cis- and trans-[Co(en)2C12]^+ c. (+)[Co(en)3]^3+ and (-)[Co(en)3]^3+ d. [Co(NH3)4CO3]NO3 and [Co(NH3)5CI]C12The ion [RuCl(NO)2(PPh3)2]+ has N — O stretching bands at 1687 and 1845 cm-1. The C — O stretching bands of dicarbonyl complexes typically are much closer in energy. Explain.
- What is the LFSE for the [Re(H2O)6]3+complex, knowing that ΔΔo = 33000 cm-1 and P= 15000 cm-1 ?A solution containing the complex formed between Bi(III) and thiourea has a molar absorptivity of 9.32 x 103 M-1 cm-1 at 470 nm. (a) Calculate the absorption of a 4.25x10-5 M solution of the complex at 470 nm in a 1-cm cell. (b) What is the molar concentration of the complex in a solution that has the calculated absorption in (a) when measured at 470 nm in a 2.50 cm cell?For the aqueous [Ni(NH3 )6]2+ complex Kf=5.50 x 108 at 25C . Suppose equal volumes of 0.0024 M Ni(NO3 )2solution 0.94M NH3solution are mixed. Calculate the equilibrium molarity of aqueous Ni2+ ion. Round your answer to 2 significant digits.