This document contains an unsolved chemistry practice paper from 1985 for the IIT JEE entrance exam. It has 5 sections with multiple choice, fill in the blank, true/false, and matching questions covering various chemistry concepts. The topics include the Bohr model, reaction types, gas laws, acid-base chemistry, organic chemistry reactions, and properties of elements and compounds.
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IIT JEE Chemistry 1985
1. IIT JEE - Past papers CHEMISTRY- UNSOLVED PAPER – I985
2. SECTION – I Single Correct Answer Type This section contains 20 multiple choice questions. Each question has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.
3. 01 Problem Bohr model can explain: The spectrum of hydrogen atom only Spectrum of an atom or ion containing one electron only The spectrum of hydrogen molecule The solar spectrum
4. Problem 02 The molecule having one unpaired electron is: NO CO CN- d.
5. Problem 03 An example of a reversible reaction is: a. b. c. d.
6. Problem 04 Rate of diffusion of a gas is: Directly proportional to its density Directly proportional to its molecular weight Directly proportional to the square root of its molecular weight Inversely proportional to the square root of its molecular weight
7. Problem 05 For a dilute solution, Raoult’s law states that: The lowering of vapour pressure is equal to the mole fraction of solute The relative lowering of vapour pressure is proportional to the amount of solute in solution The relative lowering of vapour pressure is proportional to the amount of solute in solution The vapour pressure of the solution is equal to the mole fraction of solvent
9. Problem 07 The radius of an atomic nucleus is of the order of: cm 10-13cm 10-14cm 10-8cm
10. Problem 08 The best indicator for detection of end point in titration of a weak acid and a strong base is: Methyl orange (3 to 4) Methyl red (5 to 6) Bromothymol blue (6 to 7.5) Phenolphthalein (8 to 9.6) Note: Figures in the brackets show the pH range of the indicator
29. 01 Problem The rate of chemical change is directly proportional to _________.
30. Problem 02 The terminal carbon atom in butane is ___________ hybridized. .
31. Problem 03 On Milliken scale, the average of ionization potential and electron affinity is known as _____________.
32. Problem 04 The number of neutrons in the parent nucleus which gives 14N on beta emission is __________.
33. Problem 05 Sodium dissolved in liquid ammonia conducts electricity because_________.
34. SECTION – IV True or false This question contains five statements, each of which is either true of false. Indicate your choice of the answer in the answer-book by writing TRUE or FALSE for each statement.
42. Problem 08 Heat capacity of a diatomic gas is higher than that of a monatomic gas.
43. Problem 09 Addition of ammonium chloride to a solution containing ferric and magnesium ions is essential for selective precipitation of ferric hydroxide by aqueous ammonia