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HSC Chemistry Model Question,No-07


Subject: Chemistry
Time : 3 hrs.                                                                                                                                         Marks. 75

Group A (Descriptive)

1.         a)         Write the basic postulates of kinetic theory of gases.                                                      4
            b)         Oxidation and reduction take place simultaneously explain with electronic concept.         4
            c)         What is Radioactivity? Discuss the nuclear fusion  reaction with example.                                   4
            d)         How many molecules are present in 25 ml gas at 300c and 740 mm pressure?
or        
            a)         Write down the Dalton's law of partial pressure. Deduce the relation between partial      1+3
            pressure of a gas and mole fraction.
            b)         State the modern periodic law. Discuss the position of Hydrogen in the periodic table.    4
            c)         Write the electronic configuration of the following :                                                                     3
                        Cu (29); Al  ;   S  .

            d)         At 270c 200 cm3 of  H2 at 30 cm (Hg) pressure and 300 cm3 of N2 at 40 cm (Hg) pressure are             kept in a vacuum. flask of 400 com3. Calculate the total pressure of the gas mixture at that     temperature.

2.         a)         Write down the modern periodic law. and three defects of modern periodic table.                      4
            b)         Write the fundamental postulates of Bohr's atom model.                                                 4
            c)         What is ionic bond? Explain with example.                                                                                4
            d)         What types of bond are present in the following compounds:-                                        3
                                    i)          Ca Cl2              ii)  CH4
or.       
            a)         (i)         "Chemical equilibrium is always dynamic"- explain.                                                        3
                        (ii)        Write down two differences between orbit and orbital.                                      2
            b)         Diagonal relationship remains in between lithium and Magnesium - explain.                    3
            c)         Explain ionic character of covalent bond and covalent character of ionic bond.                           4
            d)         Find the RMS velocity of O2 gas at O0c temp.                                                               3

3.         a)         Explain exothermic reaction and endothermic reaction with example.                              4
            b)         What is La-chatelier's principle? Explain the effect of temperature on chemical equilibrium          according to this principle.
            c)         What are possible and what are not possible of the following orbitals explain.                 3
                         2p,  1p,  4 S.
            d)         A piece of  iron is dipped into H2 SO4 Soln . To oxidize the produced ferrous sulphate fully        into ferric ion 0.01M KM n04  Soln  of 95 ml. is needed. What is the mass of that iron piece?

or,        a)         Show the balancing reaction of potassium permanganate by hydrogen sulphide in presence of     dilute sulphuric acid.
            b)         What is Radioactivity? What change takes place when a radioactive element emits -ray?
            c)         What is electro negativity? Why   electronegativty increases with the increasing atomic
            number of elements in a period.
            d)         To oxidize 0.5g impure green vitriol 5 ml of 0.05m kMnO4 solution is needed. Find the percentage of impurities in this green vitriol.

Group B ( short Type)

4.         a)         What is meant by the Hybridization of orbitals?                                                              3
            b)         Why is Hcl polar?                                                                                                                     2

or,        a)         Calculate the oxidation number of the underlined elements in the following compounds.   3
                        i)          K MnO4                       ii)         Na2 S2 O3        iii)   K2 Cr2 O7. 
            b)         What are S.T.P and S.A.T.P


5.         a)         Find the position of the following elements in the periodic table.                                      3
                        (i)         Sc ( 21)                        ii)         K (19)              iii)  P (15)

            b)         What is co-ordinate bond? Give example.                                                                                 2

or         a)         Describe Rutherford's atomic model.                                                                                         3
            b)         Arrange Mg Cl2, AlCl3 according to their ionic character.                                                          2

6.         a)         What is iodometry and iodimetry?                                                                                             3
            b)         What is law of mass action?                                                                                                      2
           
or         a)         Explain why Na+ is possible but not Na 2+.                                                                                2
            b)         Write down the causes for the inertness of inert gases.                                                   3

7.         a)         Complete the reactions :                                                                                                            3
                        i)           Al +  n           ? +   H.
                        ii)                    ? +   He

            b)         Describe the Rutherford's - scattering experiment.                                                                  2
or         a)         What is redox reaction ?                                                                                                           2
            b)         Show the electronic configuration of,                                                                             3
                        i)   Fe 3+   (26)              ii)         Zn 2+ (30)         iii)   Cu  (29)

8.         a)         State graham's diffusion law. From this law how will you determine molecular weight      4
            of an unknown gas?                                                                             
            b)         What is Hund's rule.                                                                                                                  1

or         a)         What is quantum number? Describe the significance of magnetic and subsidiary quantum              4
            number.
            b)         What is pauli's Exclusion principle.                                                                                            1

9.         a)         What is principal quantum number.                                                                                            3
            b)         Which one is more ionic and why KCl or Ca Cl2.                                                                      2
or         a)         What is Electron Affinity? How electron affinity changes in a period of the periodic table?  3
            b)         In NH3, why the bond angle of H -N- H is 1070?

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