This document contains an unsolved chemistry paper from 1997 containing multiple choice questions testing knowledge of chemistry concepts. The questions cover topics such as molar heat capacity, standard enthalpies of formation, ionization potentials, properties that increase with atomic number for alkaline earth metals, mechanisms of nitration reactions, stereochemistry, solubility products, and identification of ions. There are three sections with a total of 30 questions testing understanding of fundamental chemistry principles.

1. IIT –Past papersCHEMISTRY - UNSOLVED PAPER - 1997

2. SECTION – ISingle Correct Answer TypeFor answering each of the following sub-question, four alternatives are given, identify the correct/most suitable answer

3. 01ProblemMolar heat capacity of water in equilibrium with ice at constant pressure isa. zerob. infinity c.d.

4. Problem02Standard molar enthalpy of formation of CO2 is equal to zero the standard molar enthalpy of combustion of gaseous carbon.the sum of standard molar enthalpies of formation of CO and CO2the standard molar enthalpy of combustion of carbon(graphite)

5. Problem03The incorrect statement among the following isthe first ionization potential of Al is less than the first ionization potential of Mg.the second ionization potential of Mg is greater than the second ionization potential of Na.the first ionization potential of Na is less than the first ionization potential of Mg.the third ionization potential of Mg is greater than the third ionization potential Al

6. Problem04Among ,unpaired electron is present ina.b.c. onlyd. only

7. Problem05Property of the alkaline earth metal that increases with their atomic number isionization energysolubility of their hydroxidessolubility of their sulphateselectro negativity

8. Problem06Nitrobenzene can be prepared from benzene by using a mixture of conc. and conc. .In the nitrating mixture, acts as a baseacidreducing agentcatalyst

9. Problem07The first use of quantum theory to explain the structure of atom was made byHeisenbergBohrPlanckEinstein

10. 08ProblemIn the following groups, the order of leaving group ability isa.b.c.d.

11. Problem09During debromination of meso-dibromobutane, the major compound formed isn-butane1-butenecis-2-butenetrans-2-butene

12. Problem10In the following compounds:- the order of basicity isa.b.c.d.

13. Problem11The number of possible enantiomeric pairs that can be produced during monochlorination of 2-methylbutane is2341

14. 12ProblemAmong the following statements on the nitration of aromatic compounds, the false one isthe rate of nitration of benzene is almost the same as that of hexadeuterobenzene.the rate of nitration of toluene is greater than that of benzene.the rate of nitration of benzene is greater than that of hexadeuterobenzene.nitration is an electrophilic substitution reaction.

15. Problem13The intermediate during the addition of HCI to propane in the presence of peroxide isa.b.c.d.

16. Problem14The order of reactivity of following alcohols towards conc. HCl isa.b.c.d.

17. Problem15The correct statement about the compound A,B,C isA and B are identicalA and B are diastereomersA and C are enantiomersA and B are enantiomers

18. SECTION – IIFill in the blanks

19. Problem01In the sodium chloride structure ,each ion is surround by six Cl- ions nearest neighbours and ________ Na+ ion next nearest neighbours.

20. 02ProblemAmong ,the linear species are _______ ,and ____________ .

21. Problem03 Among __________ is least reactive towards water.

22. Problem04The angle molecule is ________ degree.

23. Problem05The absolute temperature of an ideal gas is __________to/than the average kinetic energy of the gas molecules.

24. Problem06 is _______ acidic than .

25. Problem07On heating will decompose giving _____ and _______ .

26. Problem08A solution of sodium in liquid ammonia at -33 conducts electricity .On cooling ,the conductivity of this solution ______________ .

27. Problem09For a gaseous reaction ,the equilibrium constant Kp is ________ to/thanKc

28. Problem10When an aqueous solution of sodium fluoride is electrolyzed, the gas liberated at the anode is _________ .

29. SECTION – IIISingle correct typeFor each of the following sub-question, four alternatives are given. Indicate the correct answer.

30. Problem01 If for fluoride ion at 25 10.83,the ionization constant of hydrofluoric acid in water at this temperature isa.b.c.d.

31. Problem02Among the given compounds, the most susceptible of nucleophilic attack at the carbonyl group isa.b.c.d.

32. Problem03In a Cannizaro reaction, the intermediate that will be the best hydride donor isa.b.c.d.

33. Problem04A standard hydrogen electrode has zero electrode potential becausehydrogen is easiest to oxdisethis electrode potential is assumed to be zerohydrogen atom has only one electronhydrogen is the lightest element

34. Problem05Among the following ,the compound that is both paramagnetic and coloured isa.b.c.d.

35. Problem06The solubility in mol dm-3 of A2X2 is y. Its solubility product is6Y464Y436Y5108Y5

36. Problem07The number of moles of that will be needed to react completely with one mole of ferrous oxalate in acidic solution is.3/52/54/51

37. Problem08Among the following compounds the one that is polar and has the central atom with sp2 hybridization isa.b.c.d.

38. Problem09Among the following statements, the incorrect one iscalamine and siderite are carbonatesargentite and cuprite are oxideszinc blende and pyrites are sulphidesmalachite and azurite are ores of copper

39. Problem10The only cations present in a slightly acidic solution are .The reagent that when added in excess to this solution would identify and separate in one step isa.b.c.d.

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