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A: Detail description is given below
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A: Correct answer : tetra(cyanido-μC)nickelate (II) ion Explanation and structure given below. Thank…
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A: Which isoelectronic has largest radius?
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A: The answer to the following question is-
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Q: 10) 2 mole 2-methyl cyclopentanone CH3 a) CH3 b) 11) e OH b) ? Na OEt CH3 c) ? & C) CH3 CH3
A: Ist question: Answer of ist question is (a) , explained with a mechanism.
Define a molar extinction coefficient and briefly describe how it is measured.
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- Carbon monoxide is another common poison found in the forensic laboratory. Explain how UV-visible spectrophotometry is applied to quantify carbon monoxide in blood samples.Zinc (Zn) Calibration Curve 0.070 0.060 0.050 0.040 0.030 0.020 0.010 0.000 0.0000 0.0010 0.0020 0.0030 0.0040 0.0050 0.0060 0.0070 [Zn] (M) Estimate the concentration (in M) of an unknown Zn sample that has an absorption of 0.025. 0.0050 AbsorbanceChemistry Calculate the concentration of an anthracene solution which produced a fluorescence intensity (I) of 835 when the irradiance of the beam incident to the sample (Po) was 1.580 x 10' and the length of the medium (b) was 0.891 cm. Anthracene has a molar extinction coefficient (e) of 9.5 x 10 M-¹ cm. The proportionality constant k' for anthracene is 0.30. CO M
- Which of the following is true about fluorescence intensity of the molecule? I Fluorescence is observed in planar molecules and its intensity increase with an increase in the number of aromatic rings II When zinc is added to a hydroxyl quinoline solution the fluorescence intensity increased due to the formation of a complex which increases the rigidity of the molecule. III On increasing the intensity of the incident radiation the fluorescence intensity increases IV On increasing the concentration of the fluorigenic molecule, the fluorescence intensity increases. A plot of intensity vs concentration exhibita linear relation indefinitely in all concentration ranges. O a. II,III,IV O b. 1,11,1II,IV O. I,II,III O d. II,I,IV O e. I,II,IVExplain the similarities and differences of phosphorescence and fluorescence in view of atomic and molecular spectroscopyA substance has a fluorescence quantum yield of ϕF,0 = 0.16. In an experiment to measure the fluorescence lifetime of this substance, it was observed that the fluorescence emission decayed with a half-life of 1.5 ns. What is the fluorescence rate constant of this substance?
- A student conducted an experiment to determine the concentration of benzene in an ethanol solution. Use the UV spectrum of the solution in a 2.0 cm cell. Within the spectrum, there was a peak attributed to benzene at 260 nm, with an absorption of 0.69. In a reference source, the student found that the adsorption of the benzene strip with ethanol was 2.95 x 10-3 ppm cm-. What is the molar concentration of benzene in the sample (mm of benzene = 78.11 g/mol)A substance is known to have a molar extinction coefficient of 18,300mlxcm-1xmg-1 at its wavelength of maximum absorption. The absorption of a solution containing this substance in a 1-cm sample cell was found to be 0.327 at this same wavelength. Determine the concentration of the solution.Mercury(II) forms a 1:1 complex with triphenyltetrazolium chloride that exhibits an absorption maximum at 255 nm. The mercury(II) in a soil sample was extracted into an organic solvent containing an excess of TTC , and the resulting solution was diluted to 100.0 mL in a volumetric flask. Five-milliliter aliquots of the analyte solution were then transferred to six 25-mL volumetric flasks. A standard solution was then prepared that was 5*10^-6 M in . Volumes of the standard solution shown in the table were then pipetted into the volumetric flasks, and each solution was then diluted to 25.00 mL. The absorbance of each solution was measured at 255 nm in 1.00-cm quartz cells. Please solve and explain these questions: A.) Enter the given data pictured above into a spreadsheet and show the correct standard additions plot B.) Determine the slope and the intercept of the line C.)Determine the standard deviation of the slope and the intercept. D.) Calculate the concentration of Hg(II) in the…
- Determine the final concentration in mol dm–3 of K+ and SO42– when the following three solutions in volumetric flasks are mixed together: 500 cm3 of 0.20 mol dm–3 KAl(SO4) 2; 1000 cm3 of 0.050 mol dm–3 K2SO4 and 500 cm3 of water. The concentration of K+ is Select one: a. 0.20 × 103 mol dm–3 b. 0.20 mol dm–3 c. 0.10 × 10–3 mol dm–3 d. 0.10 mol dm–3. A student collects the following data for the absorbance of a complex measured in 1.00 cmspectrophotometric cells. The molar absorptivity (ε) of the complex under investigation is 2.25×103L/mol·cm. Calculate the concentration of the complex in solution at each time of the reaction.Time (min)MeasuredAbsorbanceComplex Concentration(M)0.000 1.50010.000 1.31320.000 1.12530.000 0.93840.000 0.750(c) Aqueous solutions of Co2+ salts are pale pink. They contain the complex ion [Co(H₂O)]2+. Addition of concentrated HCl results in a profound colour change to dark blue, due to formation of [CoC14]. The main absorption bands of [Co(H₂O)6]2+ and [CoC14] occur at 19400 cm¹ (~10 M¹ cm') and 14700 cm¹ (~ 1000 M¹ cm¹), respectively. (i) Explain the difference in the transition energies between the two complexes. (ii) Explain why the absorption band of [CoC14]² is much more intense than that of [Co(H2O)%]2+. (d) Calculate the ligand field stabilisation energy of the following complexes: (i) [Mn(H₂O)6]2+ (ii) [Fe(CN)6]³ (iii) [CoC14]²-