IIT JEEE Chemistry -1985

IIT JEE - Past papers: 

IIT JEE - Past papers CHEMISTRY- UNSOLVED PAPER – I985

SECTION – I: 

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.

Problem: 

01 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

Problem : 

Problem 02 The molecule having one unpaired electron is: NO CO CN - d.

Problem: 

Problem 03 An example of a reversible reaction is: a. b. c. d.

Problem: 

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: 

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

Solution: 

Solution 06 The reaction occurs in the galvanic cell: Ag|AgCl |(s) | KCl ( soln ) |AgNO3 ( soln ) |Ag PtH 2 (g) | HCl ( soln ) | ( soln ) |Ag PtH 2 (g) | HCl ( soln ) | AgCl (s) |Ag PtH 2 (g) | KCl ( soln ) | AgCl (s) |Ag

Problem: 

Problem 07 The radius of an atomic nucleus is of the order of: cm 10-13cm 10-14cm 10-8cm

Problem: 

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: 

Problem 09 Nitrogen dioxide cannot be obtained by heating: a. b. c. d.

Problem: 

Problem 10 The oxide that gives hydrogen peroxide on treatment with a dilute acid is: a. b. c. d.

Problem: 

Problem 11 The molecular formula of Gluer's salt is : a. b. c. d.

Problem: 

Problem 12 A gas that cannot be collect over water is: a. b. c. d.

Problem: 

Problem 13 The conjugate acid of NH is: a. b. c. NH d.

Problem: 

Problem 14 Acidic hydrogen is present in: Ethyne Ethene Benzene Ethane

Problem: 

Problem 15 The compound that will not give iodoform on treatment with alkali and iodine is: Acetone Ethanol Diethyl ketone Isopropyl alcohol

Problem: 

Problem 16 Anti- Markownikoff addition of HBr is not observed in: Propene Butene But –2-ene Pent-2-ene

Problem: 

Problem 17 The compound that is not a Lewis acid is: a. b. c. d. SnCl

Problem: 

Problem 18 The compound that is most reactive towards electrophonic nitration is: Toluene Benzene Benzoic acid Nitrobenzene

Problem: 

Problem 19 Hydrogen gas will not reduce: Heated cupric oxide Heated ferric oxide Heated stannic oxide Heated aluminum oxide

Problem: 

Problem 20 Electromagnetic radiation with maximum wavelength is: Ultraviolet Radio wave X-ray Infrared

SECTION – II: 

SECTION – II Give the reason in one or two sentences for each of the following.

Problem: 

01 Anhydrous HCl is a bad conductor of electricity but aqueous HCl is a good conductor. Problem

Problem : 

Problem . 02 O- Nitrogen is steam volatile whereas p- nitro phenol is not .

Problem: 

Problem 03 Formic acid is stronger acid than acetic acid.

Problem: 

Problem 04 Graphite is used as a solid lubricant .

Problem: 

Problem 05 Fluorine cannot be prepared from fluorides by chemical oxidation .

SECTION – III: 

SECTION – III Complete the following sentences

Problem: 

01 The rate of chemical change is directly proportional to _________. Problem

Problem : 

Problem . 02 The terminal carbon atom in butane is ___________ hybridized.

Problem: 

Problem 03 On Milliken scale, the average of ionization potential and electron affinity is known as _____________.

Problem: 

Problem 04 The number of neutrons in the parent nucleus which gives 14 N on beta emission is __________.

Problem: 

Problem 05 Sodium dissolved in liquid ammonia conducts electricity because_________.

SECTION – IV: 

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.

Problem: 

01 Kinetic energy of molecule is zero at C Problem

Problem : 

Problem 02 Carbon tetrachloride is inflammable.

Problem: 

Problem 03 All molecules with polar bonds have dipole moment.

Problem: 

Problem 04 A gas in a closed container will exerts much higher pressure due to gravity at the bottom than at the top.

Problem: 

Problem 05 M- Chlorobromobenzene is an isomer of m- bromochlorobenzene .

Problem: 

Problem 06 Iodide is a better nucleophile than bromide.

Problem: 

Problem 07 ­ is nonlinear molecule.

Problem: 

Problem 08 Heat capacity of a diatomic gas is higher than that of a monatomic gas.

Problem: 

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

Problem: 

Problem 10 Solubility of sodium hydroxide increases with increase in temperature.

SECTION – V: 

SECTION – V Arrange the following in order of their sentences

Problem: 

01 Decreasing ionic size Problem

Problem : 

Problem 02 Increasing acidic property ZnO , MgO

Problem: 

Problem 03 Increasing first ionization potential Mg, Al, Si, Na

Problem: 

Problem 04 Increasing reactivity towards HCN , HCHO, C2H5COCH3

Problem: 

Problem 05 Increasing bond length

SECTION – IV: 

SECTION – IV Match the following

Problem: 

01 Spinel Felspar Cerussite Malachite Kisserite Problem

Problem : 

Problem 02 Liquid air Deacon Process Parke process Nitric oxide Claude process Silver Ostwald process Chlorine Solvay process

Problem: 

Problem 03 Phenol colored glass antichlor Salicylic acid refractory material Quick lime antiseptic CuO analgesic

Problem: 

Problem 04 Aston radium Priestley radioactivity Ramsay oxygen Marie Curie inert gas Becquerel mass spectrum

Slide 57: 

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