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  Question 1. Given that the abundances of isotopes 54 Fe. 56 Fe and 57 Fe are 5%, 90% and 5%, respectively the atomic mass of Fe is [A]  55.85 [B]  55.95 [C]  55.75 [D]  56.05 Question 2. The term that corrects for the attractive forces present in a real gas in the van der Waals equation is [A]  nb [B][C][D]  -nb Question 3.  Among the electrolytes Na 2 SO 4 , CaCl 2 , Al 2 (SO 4 ) 3  and NH 4 Cl, the most effective coagulating agent for Sb 2 S 3  sol is [A]  Na 2 SO 4 [B]  CaCl 2 [C]  Al 2 (SO 4 ) 3 [D]  NH 4 Cl Question 4. air dissolved in 10 moles of water at 298 K and 5 atm pressure is [A]  4.0 x 10 -4 [B]  4.0 x 10 -6 [C]  5.0 x 10 -4 [D]  4.0 x 10 -6 Question 5. The reaction of p 4  with X leads selectively to p 4 O 6 . The X is [A]  Dry.O 2 [B]  A mixture of O 2  and N 2 [C]  Moist O 2 [D]  O 2  in the presence of aqueous NaOH Question 6. The correct acidity order of the following is [A]  (III) > (IV) > (II) > (I) [B]  (IV) > (III) > (I) > (II) [C]  (III) > (II) > (I) > (IV) [D]  (II) > (III) > (IV) > (I)  Question 7.  Among cellulose, poly(vinyl chloride), nylon and natural rubber, the polymer in which the intermolecular force of attraction is weakestis [A]  Nylon [B]  Poly(vinyl chloride) [C]  Cellulose [D]  Natural Rubber  Question 8. The IUPAC name of the following compound is [A]  4-Bromo-3-cyanophenol [B]  2-Bromo-5-hydroxybenzonitrile [C]  2-Cyano-4.hydroxybromobenzene [D]  6-Bromo-3-hydroxybenzonitrile Question 9. The correct statement(s) regarding defects in solids is(are) [A]  Frenkel defect is usually favoured by a very small difference in the sizes of cation and anion [B]  Frenkel defect is a dislocation defect [C]  Trapping of an electron in the lattice leads to the formation of F-center  [D]  Schottky defects have no effect on the physical properties of solids Question 10. The compound(s) that exhibit(s)geometrical isomerism is(are) [A]  [Pt(en) 2 C1 2 ] [B]  [Pt(en) 2 ]Cl 2 [C]  [Pt(en) 2 C1 2 ]Cl 2 [D]  [Pt(NH 3 ) 2 C1 2 ] Question 11. The compound(s) formed upon combustion of sodium metal in excess air is(are) [A]  Na 2 O 2 [B]  Na 2 O [C]  NaO 2 [D]  NaOH Question 12. The correct statament(s) about the compound H 3 C(HO)HC-CH=CH-CH(OH)OH 3  (X) is(are) [A]  The total number of stereoisomers possible for X is 6 [B]  The total number of diastereomers possible for X is 3 [C]  If the stereochemistry about the double bond in X is trans, the number of enantiomers possible for X is 4 [D]  If the stereochemistry about the double bond in X is cis. the number of enantiomers possible for X is 2 Question 13. p-Amino-N, N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueoussolution of Y to yield blue coloration due to the formation of methylene blue. Treatment of the aqueous solution of Y with the reagentpotassium hexacyanoferrate(II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, treatment of the solution of Y with the solution of potassium hexacyanoterrate(III) leads to a brown colorationdue to the formation of Z.The compound X is [A]  NaNO 3  [B]  NaCl [C]  Na 2 SO 4 [D]  Na 2 S Question 14. p-Amino-N, N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueoussolution of Y to yield blue coloration due to the formation of methylene blue. Treatment of the aqueous solution of Y with the reagentpotassium hexacyanoferrate(II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, treatment of the solution of Y with the solution of potassium hexacyanoterrate(III) leads to a brown colorationdue to the formation of Z.The compound Y is [A]  MgCl 2 [B]  FeCl 2 [C]  FeCl 3 [D]  ZnCl 2 Question 15. p-Amino-N, N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueoussolution of Y to yield blue coloration due to the formation of methylene blue. Treatment of the aqueous solution of Y with the reagentpotassium hexacyanoferrate(II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, treatment of the solution of Y with the solution of potassium hexacyanoterrate(III) leads to a brown colorationdue to the formation of Z.The compound Z is [A]  Mg 2 [Fe(CN) 6 ] [B]  Fe[Fe(CN) 6 ] [C]  Fe 4 [Fe(CN) 6 ] 3   [D]  K 2 Zn 3  [Fe(CN) 6 ] 2 Question 16.  A carbonyl compound P, which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give anolefin Q. Ozonolysis of Q leads to a dicarbonyl compound R, which undergoes intramolecular aldol reaction to give predominantly S.The structures of the carbonyl compound P is [A][B][C][D]Question 17.   A carbonyl compound P, which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give anolefin Q. Ozonolysis of Q leads to a dicarbonyl compound R, which undergoes intramolecular aldol reaction to give predominantly S.The structures of the products Q and R, respectively, are [A][B][C][D]Question 18.  A carbonyl compound P, which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give anolefin Q. Ozonolysis of Q leads to a dicarbonyl compound R, which undergoes intramolecular aldol reaction to give predominantly S.The structure of the product S is [A][B]
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