BCHCT-137 EM 2026 SOLVED ASSIGNMENT

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Tutor Marked Assignment

BCHCT-137: COORDINATION CHEMISTRY, STATES OF MATTER & CHEMICAL KINETICS

Course Code: BCHCT-137

Assignment Code: BCHCT-137/TMA/2026

Maximum Marks: 100 Note: Attempt all questions. The marks for each question are indicated against it. PART A: COORDINATION CHEMISTRY

1. Give the name and symbols for the elements that have the following valence configurations. i) 4s13d5 ii) 5s24d5 iii) 5s24d10 iv) 5s14d8 v) 4s13d10 vi) 5s14d4 (
2. In [Cu(H2O)6]2+ the observed magnetic moment is higher than the spin-only value. Explain the reason for this in the space provided below
3. What is the general pattern of electronic configuration of the lanthanoids? Give the three exceptions to this
4. Determine the coordination number and the oxidation state of the transition metal ion in each of the following complex: (a) +3 6 3 ] ) [Co(NH (b) , ] [CuCl 2 4 – (c) , Cl ] ) [Cu(NH 2 43 (d) ] [PtCl K 6 2
5. Explain why Co(III)–NO2 (nitro) complexes slowly convert into Co(III)–ONO (nitrito) complexes or vice versa.
6. According to valence bond theory, how do you account for the indicated molecular geometry for the following compounds: (i) [Co(NH3)6]3+ – Octahedral and (ii) [ZnCl4]2- – Tetrahedral (5) 7. Explain polymerization ligand isomerism with suitable example.
7. What would be the CFSE for an octahedral complex of a d6 ion in weak field and strong field?

9 Six-coordinate d9 complexes of copper (+2) show pronounced tetragonal distortions. High-spin d4 (e.g., Cr2+ and Mn3+ and low-spin d7 six-coordinate complexes (e.g. Co2+ and Ni3+) may show a similar distortion, but complexes of these ions are less common, and the distortions are less pronounced than those in copper (+2). Why?

10. Determine how many unpaired electrons are contained in the following octahedral complex ions: 3-[Co(CN) ]6 , 3-[CoF ]6 Estimate the magnetic moments of these complexes

PART B: STATES OF MATTER & CHEMICAL KINETICS

11. a) How many molecules of oxygen are present in 0.0032 kg of the gas?
12. b) Calculate the temperature at which the root mean square velocity, the average velocity and the most probable velocity of the oxygen gas are all equal to 1500 ms-1
13. Calculate the pressure of 3.000 mol of methane at 298.2 K using the other data from the above illustration and assuming that it obeys van der Waals equation. Also calculate its value, if methane were to behave ideally at 298.2 K.
14. What is meant by total attractive interaction energy in molecules? Explain the factors that influence its magnitude.
15. With suitable diagrams, explain the plane of symmetry in a cubic system.
16. Explain the seven primitive unit cells in crystals. Give suitable diagrams
17. The density and cell-edge length of potassium chloride (KCl) are 1.99 × 103 kg m-3 and 6.29 × 10-10 m, respectively. Using these data, determine the number of formula units per unit cell of potassium chloride crystal.
18. a) In the decomposition reaction of hydrogen iodide, given below 2HI (g) ® H2(g) + I2 (g) find out the relationship between the rate of reaction in terms of decomposition of HI and in terms of formation of H2 (g).
19. b) Give the factors affecting the rate of a reaction. How do catalyst affect the rate of the reaction?
20. a) What is the effect of pressure and temperature on the viscosity of gases? Explain briefly.
21. b) What are the differences in the behaviour of real and ideal gases? Derive the expression for the critical temperature of a van der Waals gas
22. a) Write the differential rate equations for the following reactions, assuming them to be elementary reactions:

) i) 2 5 3 2 A B C D E + ® + + ii) 2 3 A B C + ®

36. b) Azomethane (CH3)2N2 decomposes with first order kinetics according to the equation (CH3)2N2(g) ® N2(g) + C2H6(g) The following data were obtained for the decomposition in a 200 ml flask at 300° Time (t) in min 0 15 30 48 95 Total pressure, torr 36.2 42.4 46.5 53.1 59.3 Calculate the rate constant and the half-life for this reaction.
37. a) Calculate the activation energy of a reaction whose rate constant is tripled by a 10°C rise in temperature in the vicinity of 32°C
38. b) Discuss the activated complex theory of biomolecular reactions. Explain how this theory helps in evaluating standard enthalpy of activation and standard entropy of activation.