This document contains 27 chemistry problems from an unsolved 1996 IIT past paper. The problems cover a range of chemistry topics including gases, thermodynamics, kinetics, equilibrium, acids/bases, and nuclear chemistry. They involve identifying properties, relationships, and ordering compounds and reactions. The problems require calculation and reasoning skills to apply chemistry concepts.

1. IIT –Past papers CHEMISTRY- UNSOLVED PAPER - 1996

2. SECTION – I Single Correct Answer Type

3. 01 Problem A mixture of ideal gases is cooled up to liquid helium temperature (4.22K) to from an ideal solution .Is this statement true of false? justify your answer in not more than two lines.

4. Problem 02 The wave number for the shortest wavelength transition in the Balmer series of atomic hydrogen is. 27420 cm-1 28420 cm-1 29420 cm-1 12186 cm-1

5. Problem 03 The rate constant, the activation energy and the Arrhenius parameter of a chemical reaction at respectively. The value of the rate content as is, a. b. c. infinity d.

6. Problem 04 The ratio between the root mean square speed of at 50K and that of at 800 K is, 4 2 1 1/4

7. Problem 05 The orbital angular momentum of an electron in 2s orbital is: a. b. Zero c. d.

8. Problem 06 In the following compounds, the order of acidityis: a. b. c. d.

9. Problem 07 In the Cannizzaro reaction given below, the slowest step is the attack of at the carbonly group the transfer of hydride to the carbonyl group the abstraction of proton from the carboxylic acid the deprotonation of

10. 08 Problem Hydrolysis of one mole of peroxdisulphuric acid produces two moles of sulphuric acid two moles of peroxomonosulphuric acid one mole of sulphuric acid and one mole of peroxomonosulphuric acid one mole of sulphuric acid ,one mole of peroxomonosulphuric acid and one mole of hydrogen peroxide.

11. Problem 09 The following compounds have been arranged in order of their increasing thermal stabilities. Identify the correct order. a. b. c. d.

12. Problem 10 Among the following species, identify the is structural pairs a. b. c. d.

13. Problem 11 The number and type of bonds between two carbon atoms in are: One sigma and one pi (π) bonds one sigma and two pi (π) bonds one sigma and one and a half pi (π) bonds one sigma bonds

14. 12 Problem Which of the following statements is correct for ? It is a covalent compound It contains ions It contains ions It contains and lattice molecule

15. Problem 13 Arrange the following compounds in order of increasing dipole moment. Toluene (I) m-dichlorobenzene(II) 0-dichlorobenzene (III) p-dichlorobenzene(IV) a. b. c. d.

16. Problem 14 KF combines with HF to form .The compound contains the species: a. b. c. d.

17. Problem 15 Which compound is formed when excess of KCN is added to an aqueous solution of copper sulphate? a. b. c. d.

18. Problem 16 Which compound does not dissolve in hot, dilute ? HgS PbS CuS CdS

19. 17 Problem Sodium this ulphate is prepared by reducing solution with boiling solution with S in alkaline medium neutralizing solution with boiling solution with S in acidic medium

20. Problem 18 A dilute aqueous solution of is electrolyzed using platinum electrodes. The products at the anode and cathode are: a. b. c. d.

21. Problem 19 gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical conditions is: 10 seconds : He 20 seconds : O2 25 seconds : CO 55 seconds : CO2

22. Problem 20 One mole of at 300 K is kept in a closed container under one atmosphee. It is heated to 600 K when 20% by mass of decomposes to .The resultant pressure is: 1.2 atm 2.4 atm 2.0 atm 1.0 atm

23. Problem 21 When N2 goes to bond distance _________, and when O2 goes to ,the O-O bond distance ________ .

24. Problem 22 A ten-fold increase in pressure on the reaction , at equilibrium results in _____________ in

25. Problem 23 Which of the following halides is least stable and has doubtful existence ? a. b. c. d.

26. Problem 24 Which one of the following oxides is neutral ? a. b. c. d.

27. Problem 25 Which of the following has the maximum number of unpaired electrons? a. b. c. d.

28. Problem 26 The following acids have been arraanged in the order of decreasing acid strength.Identify the correct order. a. b. c. d.

29. Problem 27 is a stable isotope. is expected to disintegrate by emission emission Positron emission proton emission

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