IGNOU BCHCT-137 December 2022 Previous Year Question Paper

Q1.Why are the atomic radii of the elements of third transition series much smaller than expected ?

Q2.Which of the following ions is colourless and why ? 5

(i) Cut

(ii) Ni2*

Q3.What are lanthanoids and actinoids ? Why are they so called ?

Q4.(a) Explain with a suitable example how bridging ligands are named in coordination compounds. 3

(b) Write the formulae of the following complexes : G) Pentammine (nitrito-KO) cobalt(III) chloride 1 Gi) Dichloridobis (1, 2-diaminoethane) rhodium(III) ion

Q5.Explain with suitable examples the inner and outer orbital complexes and predict their geometry and magnetic behaviour also.

Q6.What are the factors affecting the magnitude of crystals field splitting energy ?

Q7.Explain Jahn-Teller effect in the थक configuration of CuCl. 5 Part—B (Marks : 25)

Q8.(a) One mole of gas A is mixed with four moles of gas B. Calculate the mole fraction of the gas A. 1

(b) On the basis of the assumptions of kinetic theory of gases, derive the following expression for the pressure of a gas: 4 p= 1 mNu~? 3 Vv

Q9.(a) Calculate the root mean square speed for the molecules of oxygen gas at a temperature of 500 K. Given : Mm (Oz) =

Q10.032 kg mol-!). 2

(b) Arrange the following gases in terms of increasing values of average speed of their molecules at 300 K: 3 Hy, Ny, O5 (Take the molar mass of the gases as 0.002,

Q11.028 and 0.032 kg mol"! respectively).

Q12.What is the effect of temperature on the viscosity of a liquid ?

Q13.What are the seven primitive unit cells in crystals ? Draw any one of them.

Q14.Give the classification of stoichiometric defects.

Q15.(a) What is half life of a reaction ? Give expression for the half life of a second order reaction. 2

(b) Derive the integrated rate law for a first order reaction.

Q16.For the following reaction : 2A + B —> products the initial rates for different initial concentrations of A and B were determined. These are given below : 5 Initial [A]o/M [B]o/M rate/mst

Q17.10 0.05 1.3 x 10

(4)

Q18.10 0.10 2.6 x 10

(4)

Q19.20 0.10 1.04 x 10-3 Calculate :

(i) the order of the reaction with respect to A and B,

(ii) overall order of reaction,

(iii) rate constant. @ Cut

(i) Niz FARES

Q20.002, 0.028 तथा 0.032 kg mol-! Wms

Q21.10 0.05 1.3 x 10

(4)

Q22.10 0.10 2.6 x 10

(4)

Q23.20 0.10 1.04 x 10

(3)