This document contains 30 multiple choice questions from an unsolved 1995 IITJEE physics exam. The questions cover topics in physics, chemistry, and organic chemistry. They assess knowledge of gas properties, atomic and molecular structure, chemical bonding, acid-base chemistry, organic reactions, and geometric isomerism.

1. IITJEE –Past papersPHYSICS - UNSOLVED PAPER - 1995

2. SECTION – ISingle Correct Answer TypeIn each of the following questions, one choice is correct, Choose the correct answer.

3. 01ProblemWhich of the following gas molecules has the longest mean-free path?a.H2b.N2c. O2d.Cl2

4. Problem02A 3p-orbital has:two non-spherical nodestwo spherical nodesone spherical and one non-spherical nodesone spherical and two non-spherical nodes

5. Problem03Which of the following salts is most acidic in water?NiCl2FeCl2AlCl3BeCl2

6. Problem04An electrician’s solder is an alloy of:Cu and pbZn and CuSn and pbFe and Zn

7. Problem05For which of the following reactions is not equal to ?a.b.c.d.

8. Problem06An aqueous solution contains the following ions: .The addition of dil. HCl(6N)precipitatesa.b.c.d.

9. Problem07The number of electrons that are paired in oxygen molecule is:781614

10. 08ProblemWhich one of the following pairs of substances when mixed produces chlorine gas at room temperature?a.b.c.d.

11. Problem09CsBrcrstal has BCC structure.It has an edge legth of 4.3 Å .Theshortestinterionic distance between ions is:3.72 Å1.86 Å7.44 Å4.3 Å

12. Problem10Which of the following anions is not easily removed from aqueous solutions by precipition?a.b.c.d.

13. Problem11The element exhibiting most stable +2oxidation state from among the following is:SnpbFeAg

14. 12ProblemSodium nitroprusside when added to an alkaline solution of sulphide ions produces purple colouration due to the formation of a.b.c.d.

15. Problem13Which one of the following oxides is ionic?a. P2O2b. CrO3c. MnOd. Mn2O7

16. Problem14What is the chief product obtained when n-butane is treated with bromine in the presence of light at a.b.c.d.

17. Problem15When isobutyl magnesium bromide in dry ether is treated with absolute ethly alcohol, the products formed are:a.b.c.d.

18. Problem16The following compound can exhibit:geometrical isomerismgeometrical and optical isomerism'soptical isomerismtautomerism

19. 17ProblemThe products formed in the following reaction are:a.b.c.d.

20. Problem18Which of the following species is most stable?a.b.c.d.

21. Problem19The predominant product formed when 3- methyl-2-pentene reacts with HOCl is:a.b.c.d.

22. Problem20Allyl isocyanides has:9 sigma bonds and 4 pi bonds9 sigma bonds,3 pi bonds and 2 non-bonding electrons8 sigma bonds and 5 pi bonds8 sigma bonds,3pi bonds and 4 non-bonding electrons

23. Problem21 ion is not stable in aqueous solution because of disproportionate reaction. value for disproportionate of is:-019 V-0.38 V0.94 V0.38 V

24. Problem22Concentrated cannot be used to prepare HBr from NaBr because it:reacts slowly with NaBroxidisesHBrreduces HBrdisproportionate HBr

25. Problem23The dissociation of water at is 1.9x10-7 per cent and the density of water is 1.0g/cm. The ionization constant of water is:3.42x10-63.42x10-81.00x10-142.00x10-16

26. Problem24A 0.2 molal aqueous solution of a weak acid (HX)is 20 per cent ionized. The freezing point of this solution is:a.b.c.d.

27. Problem25The vander Waals constant “a” is a correction factor to the ideal gas law for the intermolecular attractions within a substance. List 1 contains the substances and List 2 contains values of “a” . List 1 List 2i) C6H6(g) A)0.217ii) C6H5CH3(g) B)5.464iii) Ne(g) C)18.000H2O(g) D)24.060Which one of the following combinations represents the correct matching of the substance with the corresponding “a” value?i-A, ii-D, iii-C, iv-Bi-D, ii-A, iii-B, iv-C

28. c. i-C, ii-D, iii-A, iv-Bd. i-B,ii-C, iii-A, iv –D

29. Problem26The number of oxygen attached to each phosphorus in P4O10 is3242.5

30. Problem27The locus of a variable point whose distance from (-2,0)is 2/3 times its distance from the line isellipse parabolahyperbola none of these

31. Problem28What is/are the product/s formed when an equimolar mixture of benzaldehyde and formaldehyde is heated with concentrated NaOH?a.b.c.d.

32. Problem29What is the decreasing order of reactivity amongst the following compounds towards aromatic electronphillc substitution?chlorobenzene benzene anilinium chloride toluene I II III IVII > I > III > IVIII > I >II > IVIV > II >I > IIII > II> III> IV

33. Problem30What are the organic products formed in the following reaction?a.b.c.d.

34. FOR SOLUTION VISIT WWW.VASISTA.NET