This document contains a past paper from the 2000 IIT JEE chemistry exam. It has two sections - Section I contains 25 multiple choice questions about various chemistry concepts. Section II contains 5 reasoning type questions where students must evaluate if an assertion and corresponding reason are both correct or incorrect. The document provides questions and problems about topics like oxidation states, acid strength, molecular geometry, hybridization, reaction mechanisms, isomerism, and properties of gases.

1. IIT JEE –Past papersCHEMISTRY - UNSOLVED PAPER - 2000

2. SECTION – ISingle Correct Answer TypeThis section contains 25 multiple choice questions. Each question has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.01ProblemAmongst the following ,identify the species with an atom in +6 oxidation state.a.b.c.d.

3. Problem02The correct order of acidic strength isa.b.c.d.

4. Problem03The correct order of radii isa.b.c.d.

5. Problem04The number of bonds in cyclic metapphosphoric acid is zerotwothreefour

6. Problem05Ammonia can be dried byanhydrous

7. Problem06Molecular shapes of arethe same, with 2,0 and 1 lone pair of electrons respectively.the same with 1,1 and 1 lone pair of electrons respectively.different, with o,1 and 2lone pairs of electrons respectively.different, with 1,0 and 2 lone pairs of electrons respectively.

8. Problem07The chemical processes in the production of steel from hematite ore involvereduction oxidationreduction followed by oxidation.oxidation followed by reduction.

9. 08ProblemThe hybridization of atomic orbital's of nitrogen in are respectively. respectively. respectively. respectively.

10. Problem09Amongst , the one with the highest boiling point is because of hydrogen bonding because of higher molecular weight. because of hydrogen bonding. because of lower molecular weight.

11. Problem10Electrolytic reduction of alumina to aluminium by hall-Heroult process is carried out in the presence of .in the presence of fluorite.in the presence of cryolite which forms a melt with lower melting temperature.in the presence of cryolite which from as melt with higher melting temperature.

12. Problem11The respectively. The standard enthalpy change (in ) for the reaction is524.141.2-262.5-41.2

13. 12ProblemThe rate constant for the reaction, is . If the rate is , then the concentration of is1.41.20.040.8

14. Problem13For the electrochemical cell , from this data one can deduce that is the spontaneous reaction is the spontaneous reaction

15. Problem14For the reversible reaction the value when partial pressure is measured in atmospheres. The corresponding value of ,with concentration in ,isa.b.c.d.

16. Problem15The rmsvelcoity of hydrogen is times the rms velocity of nitrogen. If is the temperature of the gas,a.b.c.d.

17. Problem16The compression factor of gas is less than unity at STP. Therefore, liters liter liters liters

18. 17ProblemAt and 1 tam , if the density of liquid water is 1.0 g and that of water vapor is 0.0006 g , then the volume occupied by water molecules in 1 liter of steam at this temperature is6 60 0.6 0.06

19. Problem18The electronic configuration of an element is .This represents itsexcited stateground statecationic form anionic form

20. Problem19The number of nodal planes in a orbital isonetwothreezero

21. Problem20When two reactants, A and B are mixed to give products C and D ,the reaction quotient, ,at the initial stages of the reactionis zerodecreases with timeis independent of timeincreases with time

22. Problem21Which of the following compounds will exhibit geometrical isomerism?1-phenyl-2butene3-phenyl-1butene2-phenyl-1butene1,1-diphenyl-1-propene

23. Problem22Which of the following has the most acidic hydrogen ?3-hexanone2,4-hexanedione2,5-hexanedione2,3-hexanedione

24. Problem23Among the following, the strongest base isa.b.c.d.

25. Problem24Which one of the following will most readily be dehydrated in acidic condition?a.b.c.d.

26. Problem25Which of the following has the highest nucleophilicity?a.b.c.d.

27. Problem26Propyne and propene can be distinguished by in ammonia

28. Problem27The order of reactivates of the following alkyl halides for a reaction is RF > RCI > RBr> RIRF > RBr > Rci >RIRCI > RBR > RF> RIRI > RBR > RCI > RF

29. Problem28The appropriate reagent for the following transformationa.b.c.d.

30. Problem29Benzyl chloride is prepared form benzoic acid bya.b.c.d.

31. Problem30Which one of the following alkenes will react fastest with under catalytic hydrogenation condition?a.b.c.d.

32. SECTION – IIREASON TYPE QUESTIONThe questions below (31 to 35)consist of an ‘Assertion’ in column 1 and the ‘Reason’ in column2.Use the following key to choose the appropriate answer.

33. Problem31The pressure of a fixed amount Frequency of collisions and their of an ideal gas is proportional impact both increase in proportion to to the square root of temperature its temperature.If both assertion and reason are CORRECT, and reason is the CORRECT explanation of the assertion.If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion.If assertion is CORRECT, but reason is INCORRECT.If assertion is INCORRECT, but reason is CORRECT.

34. Problem32The heat absorbed during The volume occupied by the molecules of is thermal expansion of an ideal an ideal gas is zero.If both assertion and reason are CORRECT, and reason is the CORRECT explanation of the assertion.If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion.If assertion is CORRECT, but reason is INCORRECT.If assertion is INCORRECT, but reason is CORRECT.

35. Problem331-Butene on reaction with HBr It involves the formation of a primaryin the presence of a peroxide radical. produces 1-bromobutane.If both assertion and reason are CORRECT, and reason is the CORRECT explanation of the assertion.If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion.If assertion is CORRECT, but reason is INCORRECT.If assertion is INCORRECT, but reason is CORRECT.

36. Problem34Phenol is more reactive than In the case of phenol, the intermediate benzene towards electronphiliccarbocation is more reasonanceestabilised.substitution reaction.If both assertion and reason are CORRECT, and reason is the CORRECT explanation of the assertion.If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion.If assertion is CORRECT, but reason is INCORRECT.If assertion is INCORRECT, but reason is CORRECT.

37. Problem35The first ionization energy of Be 2p orbital is lower in energy than 2s is greater than that of B.If both assertion and reason are CORRECT, and reason is the CORRECT explanation of the assertion.If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion.If assertion is CORRECT, but reason is INCORRECT.If assertion is INCORRECT, but reason is CORRECT.

38. FOR SOLUTION VISIT WWW.VASISTA.NET