IIT JEE - Past papers CHEMISTRY- UNSOLVED PAPER – I985
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.
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
Problem 02 The molecule having one unpaired electron is: NO CO CN- d.
Problem 03 An example of a reversible reaction is: a. b. c. d.
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
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
Problem 07 The radius of an atomic nucleus is of the order of: cm 10-13cm 10-14cm 10-8cm
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
Problem 09 Nitrogen dioxide cannot be obtained by heating: a. b. c. d.
Problem 10 The oxide that gives hydrogen peroxide on treatment with a dilute acid is: a. b. c. d.
Problem 11 The molecular formula of Gluer's salt is : a. b. c. d.
Problem 12 A gas that cannot be collect over water is: a. b. c. d.
Problem 13 The conjugate acid of NH is: a. b. c. NH d.
Problem 14 Acidic hydrogen is present in: Ethyne Ethene Benzene Ethane
Problem 15 The compound that will not give iodoform on treatment with alkali and iodine is: Acetone Ethanol Diethyl ketone Isopropyl alcohol
Problem 16 Anti-Markownikoff addition of HBr is not observed in: Propene Butene But –2-ene Pent-2-ene
Problem 17 The compound that is not a Lewis acid is: a. b. c. d. SnCl
Problem 18 The compound that is most reactive towards electrophonic nitration is: Toluene Benzene Benzoic acid Nitrobenzene
Problem 19 Hydrogen gas will not reduce: Heated cupric oxide Heated ferric oxide Heated stannic oxide Heated aluminum oxide
Problem 20 Electromagnetic radiation with maximum wavelength is: Ultraviolet Radio wave X-ray Infrared
Give the reason in one or two sentences for each of the following.
01 Problem Anhydrous HCl is a bad conductor of electricity but aqueous HCl is a good conductor.
Problem 02 . O-Nitrogen is steam volatile whereas p- nitro phenol is not.
Problem 03 Formic acid is stronger acid than acetic acid.
Problem 04 Graphite is used as a solid lubricant.
Problem 05 Fluorine cannot be prepared from fluorides by chemical oxidation.
SECTION – III Complete the following sentences
01 Problem The rate of chemical change is directly proportional to _________.
Problem 02 The terminal carbon atom in butane is ___________ hybridized. .
Problem 03 On Milliken scale, the average of ionization potential and electron affinity is known as _____________.
Problem 04 The number of neutrons in the parent nucleus which gives 14N on beta emission is __________.
Problem 05 Sodium dissolved in liquid ammonia conducts electricity because_________.
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.
01 Problem Kinetic energy of molecule is zero at C
Problem 02 Carbon tetrachloride is inflammable.
Problem 03 All molecules with polar bonds have dipole moment.
Problem 04 A gas in a closed container will exerts much higher pressure due to gravity at the bottom than at the top.
Problem 05 M-Chlorobromobenzene is an isomer of m-bromochlorobenzene.
Problem 06 Iodide is a better nucleophile than bromide.