AFMC Chemistry 2000

AFMC–Past papers CHEMISTRY - UNSOLVED PAPER - 2000

SECTION – I (Total Marks :50) Single Correct Answer Type There are five parts in this question. Four choices are given for each part and one of them is correct. Indicate you choice of the correct answer for each part in your answer-book by writing the letter (a), (b), (c) or (d) whichever is appropriate

01 Problem Gamma tartaric acid is inactive due to Internal compensation External compensation Molecular dissymmetry None of these

Problem 02 Rate constant depends on Temperature Time Initial concentration None of these

Problem 03 Soap removes grease by Adsorption Emulsification Coagulation None of these

Problem 04 Electricity is passed through a colloidal solution then it is called as Brownian movement Cataphoresis Electro-osmosis Tyndall effect.

Problem 05 Which of the following reactions is endothermic? N2 +O2-> 2NO H2 + Cl2 -> 2HC1 H2SO4 + 2NaOH -> Na2S04 + 2H2O None of these

Problem 06 What happens to the yield of this reaction when temperature is increased N2 + O2 2NO ∆H = + 43.2 Kcal. Increases Decreases Remains same None of these

Problem 07 Vapour density of a gas is 22. What is its molecular weight? 33 22 44 11

Problem 08 Which of the following lose charge at cathode? Ions Cations Anions None of these

Problem 09 During electrolysis of H20, volume of H2 and O2 are released in the ratio 2 : 16 16 : 1 8 : 1 2 : 1.

Problem 10 Action of catalyst depends on Mass Solubility Particle size None of these

Problem 11 Arrange the following in order of their thermal conductivity. Al, Ag, Cu Cu, Ag, A1 Ag, Cu, Al AI, Cu, Ag.

Problem 12 If heat of formation of C + O2 ->CO2 in ∆H = -94 Kcal and 2C + O2-> 2CO in ∆H = -110.5 Kcal, then heat of combustion of carbon is -94 Kcal 110.5 Kcal 16.5 Kcal 15 Kcal

Problem 13 Neutral divalent carbon species released as reaction intermediate in reaction of ethylene is Carbocation Carbene Carbanion Free radical

Problem 14 The empirical formula of an acid is CH2O2, the probable molecular formula of acid may be CH2O CH2O2 C2H4O2 C3H6O4

Problem 15 Which of the following has lowest pH value? 1 M HC1 1 M NaOH 1 M H2SO4 1 M C2H5OH

Problem 16 Neutron is discovered by Chadwick Rutherford Yukawa Dalton.

Problem 17 K4[Fe(CN)6] is a Double salt Complex compound Neutral molecule None of these

Problem 18 The variable valency is the characteristic of Halogen Transition elements Alkali metals Noble gas

Problem 19 Compounds are isobar if emission takes place 1 α emission 1 β emission 1 α and 1 β emission 2 α and 1 β emission

Problem 20 Gas evolved in Bhopal gas tragedy Methane C02 Methyl isocyanide Butene

Problem 21 Colloidal sol is True solution Suspension Heterogeneous sol Homogeneous sol

Problem 22 C6H6C16 X, where X is Benzene Phenol C6H5(OH)6 Trichlorobenzene

Problem 23 Chloroform when reacts with nitric acid gives C2H5C(NO)5SH CC13 CHOH CC13NO2 CCI3NO3

Problem 24 PV/T = constant. A real gas will behave as ideal gas When both pressure and temperature are high Both pressure and temperature are low Temperature high and pressure low Pressure high and temperature low.

Problem 25 Which is most viscous? CH3OH C2H5OH Image* None of the above

Problem 26 After two hours, the radioactive substance becomes 1/16th of original amount. Then half life in minutes is 60 minutes 120 minutes 30 minutes 15 minutes.

Problem 27 Which of the following has same number of electrons in last shell? As and Bi Sb and Pb N and O Fe and Cr

Problem 28 Which one has different number of electron in outermost shell? As, Sb Ge, Sn In, Pt Se, Te

Problem 29 The boiling point of heavy water 100°C 101.4°C 99°C 110°C

Problem 30 Which one of the following has least electron affinity? O N Ar F

Problem 31 A compound has C, H, N in the following percentage C = 40%, H = 13.33%, N = 46.67% What is its empirical formula? CH2N C2H5N CH5N CH4N

Problem 32 The correct order of pseudohalide, polyhalide and interhalogen are Brl2-, OCN-, IF5 IF5, Brl2-, OCN- OCN-, IF5, Brl2 OCN-, BrI2, IF5

Problem 33 The active constituent of bleaching powder is Ca(OCl)2 Ca(OCl)Cl Ca(C102)2 Ca(C1O2)Cl

Problem 34 Which of the following will not show resonance? H2O2 Allene Ozone Oxygen

Problem 35 Rectified spirit has ethanol 5% 95% 100% 80%

Problem 36 Which of the following impurities are present in maximum concentration in pig iron? Sulphur Iron Phosphorus Sand

Problem 37 Which has minimum osmotic pressure? 200 ml of 2 M NaCl solution 200 ml of 1 M glucose solution 200 ml of 2 M urea solution All have same

Problem 38 Isotopes have same number of Protons Neutrons Nucleus Positrons

Problem 39 Which of the following pairs is isoelectronic? Ar and CI Na+ and Ne Na+ and Mg Mg and Ne

Problem 40 The oxidation number of oxygen in 02PtF6 is Zero +1/2 +1 -1/2

Problem 41 A neutral atom contains Proton only Neutron only Neutron + electron Neutron + proton + electron

Problem 42 Electroplating was discovered by Faraday Arrhenius Newton Dalton

Problem 43 Calcination is used in metallurgy to remove H2 O and H2S H2 O and CO2 CO2 and H2S H2S and H2S

Problem 44 Fischer Tropsch process is used in the manufacture of Ethanol Benzene Ethanoic acid Synthetic petrol

Problem 45 The turbidity of a polymer solution measures the Light absorbed by the solution Light transmitted by the solution Light scattered by the solution All of these

Problem 46 When iodine is dissolved in CC14, the resulting colour is Brown Violet Yellow Bluish green

Problem 47 Pure nitrogen can be prepared from NH4OH Ca3N2 NH4NO2 BaO

Problem 48 IUPAC name of the compound Image* 4 methyl 3 hexanol 3 methyl 4 hexanol 4 methyl 2 pentanol 2 methyl 3 hexanol

Problem 49 Which of the following cannot be formed? He2+ He+ He He2

Problem 50 Which of the following undergoes sublimation? ZnCl2 CuCl2 AgCI NH4ci

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AFMC Chemistry 2000

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AFMC Chemistry 2000