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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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- The Racah parameter B for [Co(CN)6]3−=460cm−1, and [Co(NH3)6]3+= 615cm−1. Explain the difference in nephelauxetic effect. Thank you!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.What is the main origin of difference in the magnetic properties of lanthanides and transition elements?
- (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.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)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.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]C12Provide 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- .
- The 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.Ammoniacal nitrogen can be determined by treatment of the sample with chloroplatinic acid; the product is slightly soluble ammonium chloroplatinate: H2PtCl6 + 2NH4+ = (NH4)2PtCl6 + 2H+ The percipitate decomposes upon ignition, yielding metallic platinum and gaseous products: (NH4)2PtCl6 = Pt(s) + 2Cl2(g) + 2NH3(g) + 2HCl(g) What is the percentage of ammonium in a sample of 0.2213g of sample gave rise to 0.5881g of platinum?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.