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  Che (g.s. sir) 1. For gaseous state, if most probable speed is denoted by C  *, average speed by C and mean square speed by C  , then for a large number of molecules the ratios of these speed are (a) C  * : C : C = 1 : 1.225 : 1.128 (b) C  * : C : C = 1.225 : 1.128 : 1 (c) C  * : C : C = 1.128 : 1 : 1.225 (d) C  * : C : C = 1 : 1.128 : 1.225 2. Value of gas constant  R is (a) 0.082 L atm (b) 0.987 cal mol  –  1  K  –  1  (c) 8.3 J mol  –  1  K  –  1  (d) 83 erg mol  –  1  K  –  1  3. The compressibility factor for a real gas at high pressure is (a) 1 (b) 1 +  Pb /  RT (c) 1  –     Pb /  RT (d) 1 +  RT  /  Pb 4. 7.  Number of atoms in 558.5 gram Fe (at. wt. of Fe = 55.85 g mol  –  1 ) is (a) twice that in 60 g carbon (b) 6.023 × 10 22  (c) half that in 8 g He (d) 558.5 × 6.023 × 10  23  5. Which of the following sets of quantum numbers represents the highest energy of an atom? 1) n = 3, l = 0, m = 0,  s =  12   2)  n = 3, l = 1, m = 1,  s =  12   3) n = 3, l = 2, m = 1,  s =  12   4) n = 4, l = 0, m = 0,  s =  12   6. According to Bohr’s theory, the angular momentum of an electron in 5 th  orbit is 1) 25  h     2) 1.0  h     3) 10  h     4) 2.5  h     7. In which of the following molecules/ions are all the bonds not equal? (a) SF 4  (b) SiF 4  (c) XeF 4  (d) BF  –    4  8. The pair of species having identical shapes for molecules of both species is (a) CF 4  , SF 4  (b) XeF 2  , CO 2  (c) BF 3  , PCl 3  (d) PF 5  , IF 5  9. Standard entropy of  X 2  , Y    2 and  XY 3  are 60, 40 and 50 J K  –  1  mol  –  1  , respectively. For the reaction, 1/2  X 2  + 3/2 Y 2       XY 3  ,   H =  –  30 kJ, to be at equilibrium, the temperature will be (a) 1000 K (b) 1250 K (c) 500 K (d) 750 K 10. (   H  –     U  ) for the formation of carbon monoxide (CO) from its elements at 298 K is (  R = 8.314 JK  –  1  mol  –  1  ) (a)  –  1238.78 J mol    –  1  (b) 1238.78 J mol  –  1  (c)  –  2477.57 J mol  –  1  (d) 2477.57 J mol  –  1  11. The equilibrium constant (  K c ) for the reaction N 2 (  g  ) + O 2 (  g  )    2NO (  g  ) at temperature T is 4 × 10  –  4  . The value of  K c for the reaction, NO (  g  ) 12   N 2 (  g  ) + 12 O 2 (  g  ) at the same temperature is (a) 2.5 × 10 2  (b) 4 × 10    –  4  (c) 50.0 (d) 0.02 (2012) 12. The pH of a 0.1 molar solution of the acid H Q is 3. The value of the ionization constant,  K a of this acid is (a) 1 × 10    –  3  (b) 1 × 10    –  5  (c) 1 × 10  –  7  (d) 3 × 10  –  1  13. The correct sequence which shows decreasing order of the ionic radii of the element is (a) O 2  –   > F  –   > Na +  > Mg 2+  > Al 3+  (b) Al 3+  > Mg 2+  > Na +  > F    –   > O 2  –   (c) Na +  > Mg 2+  > Al 3+  > O 2  –   > F  –   (d) Na +  > F  –   > Mg 2+  > O 2  –   > Al 3+  14. Which one of the following sets of ions represents the collection of isoelectronic species?  (a) K +  , Ca 2+  , Sc 3+  , Cl  –   (b) Na +  , Ca 2+  , Sc 3+  , F  –   (c) K +  , Cl  –   , Mg 2+  , Sc 3+  (d) Na +  , Mg 2+  , Al 3+  , Cl  –   . (Atomic nos.: F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21) 15. In which of the following species is the underlined carbon having  sp 3 hybridisation? (a) CH 3  COOH (b) CH 3  CH 2  OH (c) CH 3  COCH 3  (d) CH 2  CH  –   CH 3  16. In which of the following pairs the two species are not isostructural? (a) PCl +4  and SiCl 4  (b) PF  5  and BrF 5  (c) AlF 3  –  6  and SF 6  (d) CO 2  –  3  and NO -   3  17. The order of stability of the following carbocations is (a) III > I > II (b) III > II > I (c) II > III > I (d) I > II > III 18. The increasing order of stability of the following free radicals is 19. 2Hexyne gives trans 2hexene on treatment with (a) Li/NH 3  (b) Pd/BaSO 4  (c) LiAlH 4  (d) Pt/H 2  20. In the following sequence of reactions, the alkene affords the compound  B The compound  B is (a) CH  3  CHO (b) CH 3  CH 2  CHO (c) CH 3  COCH 3  (d) CH 3  CH 2  COCH 3  21. 2Methylbutane on reacting with bromine in the presence of sunlight gives mainly (a) 1bromo2methylbutane (b) 2bromo2methylbutane (c) 2bromo3methylbutane (d) 1bromo3methylbutane. 22. The IUPAC name of neo  pentane is (a) 2methylbutane (b) 2,2dimethylpropane (c) 2methylpropane (d) 2,2dimethylbutane 23. The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is (a)  –   CONH 2  ,  –   CHO,  –   SO 3  H,  –   COOH (b)  –   COOH,  –   SO 3  H,  –   CONH 2  ,  –   CHO (c)  –   SO 3  H,  –  COOH,  –  CONH 2  ,  –   CHO (d)  –   CHO,  –  COOH,  –   SO 3  H,  –  CONH  2  24. Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides? (a) Al 2  O 3  < MgO < Na 2  O < K 2  O (b) MgO < K 2  O < Al 2  O 3  < Na 2  O (c) Na 2  O < K 2  O < MgO < Al 2  O 3  (d) K 2  O < Na 2  O < Al 2  O 3  < MgO 25. Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point? (a) LiCl (b) NaCl (c) KCl (d) RbCl  26. Consider the reaction: N 2  + 3H 2  2NH 3  carried out at constant temperature and  pressure. If   H and    are the enthalpy and internal energy changes for the reaction, which of the following expressions is true? (a)   H = 0 (b)   H =  U (c)   H < D U (d)   H >  U 27. The enthalpies of combustion of carbon and carbon monoxide are  –  393.5 and  –  283 kJ mol  –  1 respectively. The enthalpy of formation of carbon monoxide per mole is (a) 110.5 kJ (b) 676.5 kJ (c)  –  676.5 kJ (d)  –  110.5 kJ 28. The p  K a of a weak acid, (H  A ), is 4.80. The p  K b of a weak base, BOH is 4.78. The pH of an aqueous solution of the corresponding salt, B  A , will be (a) 9.22 (b) 9.58 (c) 4.79 (d) 7.01 29. The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250 mL of 2 M HCl will be (a) 0.975 M (b) 0.875 M (c) 1.00 M (d) 1.75 M * * *
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