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chemistry 2013

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Class:- M.sc(chemistry) 2nd year Paper:-Advanced Topics in Inorganic chemistry Max.Time = 3Hours Max.Marks = 75 Note:- Attempt one question from section A,B,C,D and section D is compulsory. Section:-A Q:1 a) Show that radioactive element decay exponentially with time ? b).What are the two main units to measure the intensity of radioactivity? 6 marks 3 marks c) How long does it take for 60% of sample of radon to decay? Given half life period t =3.8 days 6 marks OR Q:2 a) A certain radioactive element disintegrates for an interval of time equal to its mean life or Average life. What fraction of the element has disintegrated? 6 marks b) 10X10-3 g of radioactive material of half life period two years is kept in store for four years. How much of the material remain unchanged? 6 marks c).In the following radioactive series . Write down Z and A of the B,C,D,E A232 90 B C D E 3 marks Section:B Q :3 a)What is the physical significance of Q-Value of nuclear reaction? 5 marks b) C14 is believed to be made in upper atmosphere by an (n,p) process on 14N? what is Q for this reaction? 6 marks c)Why stable nuclei have more neutrons than protons? OR Why N tends to exceed Z in stable nuclei? Explain with examples? 4 marks OR Q:4 a) Find the nuclear density for U235 if RO=1.1X10-15 fm? 5 marks b) Compare nuclear reactions with chemical reactions? 3 marks c) Calculate the Q-value of positron decay process? 5 marks d) Write short note on nuclear cross-section? 2 marks Section-C Q:-5 a) Explain the hypothesis of charge independence of nuclear forces? 6 marks b)If an atom of 92U235 after the absorption of slow neutrons, undergo fission to produce 139Xe and 94sr ? What other particles are produced and how many? 3 marks c).Calculate the mass of deuteron nucleus if the binding energy per nucleus is 1Mcv? 6 marks OR Q:-6 a).Compare the order of strength of nuclear forces with that of electro static and gravitational forces? 4 marks b).What is the unit that measures the size of nucleus? 2 marks c).write short note on Yukawa s theory? 5 marks d).What is the relation between mass number and nucleus radius? 2 marks e).Why we say that nuclear forces are short range? 2 marks Section:-D Q:-7 a).What happens to the atomic number and mass number of nucleus when it 1).emit s electrons 2).emit s positron 3) Capture electron. 5 marks b).Write a short note on Isotopes, Isobars and isotones? 5 marks c) Calculate packing Fraction of O16.Given mass of O16 is 15.994984 a.m.u? 5 marks OR Q:-8 a) Give four reasons that why electrons cannot exist inside the nucleus? 5 marks b).The Binding energy per nucleus of O16 is 7.97 Mev and that of 17O is 7.75 Mev.Calculate the energy needed to remove a neutron from 17O. 8 marks c).write short note on Mirror nuclei? 2 marks Section :- E Q:-9 a) In the Nuclear Reaction U238 X Stands for 93 93 Np230 + X (a) Electron (b) proton (c) Neutron (d) deuteron b) The graph between binding energy per nucleon and mass number shows a cyclic recurrence of peaks of mass number interval of (a) 6 (b) 5 (c) 4 (d) 3 (c) In Modern periodic table of elements the elements have atomic masses relative to (a) 6C12 (b) 8O16 (c) 7N14 (d) None of above (d) A long lived excited nucleus is called (a) Isomer (b) isotone (c) Isobar (e) None of above (e) The value of Quadruple moment of oblate spheroid nucleus is (a) positive (b) negative (c) Zero (e) None of these

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