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IGNOU BCHCT-137 (January 2026 – December 2026) Assignment Questions
IGNOU BCHCT-137 (January 2025 – December 2025) Assignment Questions
PART A: COORDINATION CHEMISTRY
1. What is the general electronic configuration of elements of the second transition series? Which d orbitals are filled up here?
2. In [Ni(H2O)6] 2+ the observed magnetic moment is higher than the spin-only value. Explain the reason.
3. Give the most common oxidation states of the lanthanoids. Give their configurations.
4. What is meant by coordination entity and coordination sphere?
5. Give the rules of IUPAC nomenclature for naming complexes (give any five points).
6. According to valence bond theory, how do you account for the indicated molecular geometry for the following compounds:
(i) [Fe(CN)6]3- – Octahedral and (ii) [GaCl4]- – Tetrahedral
7. Explain ligand isomerism with suitable example.
8. Compare the CFSE of an octahedral complex with that of a tetrahedral complex for four electrons in the d orbitals.
9 What is meant by tetragonal distortion in octahedral geometry?
10. Calculate the spin-only magnetic moment for low-spin octahedral complex of d5 and d6 ions.
PART B: STATES OF MATTER & CHEMICAL KINETICS
11. State the assumptions of kinetic theory of gases and derive the following expression for the pressure of a gas.
12. a) State the Dalton’s law of partial pressure and give its significance.
b) Define critical constants and give their expressions in terms of van der Waals constants.
13. Explain the London or dispersion forces. Compare it with dipole-dipole forces.
14. With suitable diagrams, explain the axes of symmetry in a cubic system.
15. Explain the Bravais Lattices in orthorhombic crystals. Give suitable diagrams.
16. The density and cell-edge length of sodium chloride are 2.163 X 103 kg m-3 and 5.63 X l0-10 m, respectively. Using these data, arrive at the number of formula units per unit cell of sodium chloride crystal.
17. a) List different factors affecting the rates of chemical reactions.
b) Derive the integrated rate equation for a second order reaction in which a single reactant forms the product and the reaction rate depends on the second power of the reactant concentration.
18. What is meant by rate of a reaction? List and explain different types of rates used in chemical kinetics.
19. If the half-life of a first order reaction in A is 15 min, how long will it take for [A] to reach 10 percent of the initial concentration?
20. Compare the collision theory with Arrhenius theory.
