AFMC Chemistry 1998

AFMC–Past papers CHEMISTRY - UNSOLVED PAPER - 1998

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 When enthalpy and entropy change for a chemical reaction are -2.5 x 103 cals and 7.4 cals deg-1 respectively predict the reaction at 298 K is Irreversible Reversible Spontaneous Non-spontaneous

Problem 02 Nitrogen can be obtained from air by removing Carbon dioxide Hydrogen Oxygen Both (a) and (c)

Problem 03 Which of the following metal is present in brass, bronze and German silver? Cu Mg Zn A1

Problem 04 Benzaldehyde reacts with ammonia to form Hydro benzamide Benzamide Aniline Phenyl cyanide

Problem 05 Which of the following has zero dipole moment? NH4 CH4 PH3 CH2C12

Problem 06 The pH value of 10-8 M HC1 is More than 7 Less than 7 Equal to 7 Either (a) or (c)

Problem 07 The number of electrons shared by each outermost shell of N2 is 4 3 2 5

Problem 08 For making Ag from AgN03, which of the following is the correct statement? With Na2C03 With AsH3 With PH3 With NH3

Problem 09 Night blindness is caused by the deficiency of Vitamin-C Vitamin-A Vitamin-B12 Vitamin-E

Problem 10 Which of the following will not displace hydrogen? Hg Pb Ba Sn

Problem 11 If the volume of 2 moles of an ideal gas at 540 K is 44.8 litre, then its pressure will be 3 atmosphere 2 atmosphere 1 atmosphere 4 atmosphere

Problem 12 Anhydrous A1C13 is prepared from Dry HC1 gas + heated aluminium metal Aluminium and Cl2 Conc. HC1 and aluminium metal Dilute HC1 and aluminium metal

Problem 13 Chloroform on treatment, with concentrated HN03, gives CC13N02 CHC1HN03 CHC12N02 CHC12N03

Problem 14 Both methane and ethane can be prepared, in one step, by the reaction of CH3Br CH3OH C2H4 CH3CH2OH

Problem 15 The freezing point of a solution, prepared from 1.25 gm of a non-electrolyte and 20 gm of water, is 271.9 K. If molar depression constant is 1.86 K mole-1, then molar mass of the solute will be 115.3 106.7 105.7 93.9

Problem 16 1-Chlorobutane, on reaction with alcoholic potash (KOH), gives 2-Butene 1-Butanol 1-Butene 2-Butanol

Problem 17 If acetyl chloride is reduced in the presence of BaS04 and Pd, then CH3COOH is formed CH3CH2OH is formed CH3CHO is formed CH3COCH3 is formed

Problem 18 Lyophilic colloids are stable due to Small size of the particle Large size of particle Charge on the particle Layer of dispersion medium on the particles

Problem 19 The correct order of acidic strength is HBr < HC1 < HI < HF HC1 < HBr < HF < HI HF < HC1 < HBr < HI HI < HBr < HC1 < HF

Problem 20 Which of the following is a calomel? Hg2Cl2 HgBr2 HgCl2 HgS04

Problem 21 The hybridization of carbon in diamond, graphite and acetylene is in the order of sp sp2 sp3 sp3 sp2 sp sp3 sp sp2 sp2 sp3sp

Problem 22 The oxidation of toluene to benzaldehyde by chromyl chloride is called Fittig reaction Etard reaction Wurtz reaction Rosenmund reaction

Problem 23 Example of unit cell with crystallographic dimensions a≠b≠c, α=γ= 90°,β ≠90° is Rhombic sulphur Graphite Calcite Monoclinic sulphur

Problem 24 Nitroso amines (R2N—N = O) are insoluble in water. On heating them with conc. H2S04, they give secondary amines. This reaction is called Liebermann nitroso reaction Fries reaction Perkin reaction Etard reaction

Problem 25 In the equation 4M + 8CN- + 2H2O + 02 -> 4[M(CN)2]- + 4011 Identify the metal M Gold Iron Copper Zinc

Problem 26 Ozone is prepared by passing silent electric discharge through oxygen. In this reaction Oxygen is loaded with energy Energy is absorbed Energy is given out Oxygen is dissociated into atoms

Problem 27 Galaxies is converted into glucose in Liver Stomach Mouth An intestine

Problem 28 The lusture of a metal is due to Its chemical inertness Its high polishing Its high density Presence of free electrons

Problem 29 When cold potassium permanganate (KMnO4) is added to ethylene gives Methanol Ethanol Glycerol Ethylene glycol

Problem 30 One mole of C02 contains 6.023 x 1023 atoms of oxygen 18.1 x 1023 molecules of CO2 3 grams atoms of C02 6.023 x 1023 molecules of CO2

Problem 31 A sudden large jump between the values of second and third ionization energies of an element wou!: be associated with which of the following electronic configuration? 1s2, 1s2 2p6, 3s1, 3p2 1s2, 2s22p6, 3s23p1 1s2, 2s2 2p6 , 3s1 1s2, 2s2 2p6, 3s2

Problem 32 Chlorine is liberated, when we heat Pb(N03)2 + MnO2, K2Cr2O7 + MnO2 KMnO4 + NaCI K2Cr2O7 + HC1

Problem 33 Oxalic acid, when heated with concentrated H2SO4 gives H2O2 and CO2 CO and CO2 H2O and CO2 CO2 and H2S

Problem 34 Which of the following compounds do not belong to lipids? Phospho-lipids Amino acids Fats Carbohydrates

Problem 35 A compound is treated with NaNH2 , to give sodium salt. Identify the compound C2H6 C6H6 C2H2 C2H4

Problem 36 Aspirin is obtained by the reaction of salicylic acid with Acetic acid Acetaldehyde Acetone Acetic anhydride

Problem 37 In the Liebermann's nitro so reaction, sequential changes in the colour of phenol occurs as Red -> green ->white Red-> deep blue -> green Brown or red-> green red -> deep blue White -> red green

Problem 38 Which of the following is obtained when N2 reacts with calcium carbide? Calcium cyan amide Calcium acetate Calcium cyan ate Calcium carbonate

Problem 39 Identify Z in the reaction BrCH2CH2CN NCCH2CH2CN CH3CH2CN BrCH = CHCN

Problem 40 If 5.85 grams of NaC2 (molecular weight = 58.5) is dissolved in 90 grams of water, the mole fraction of NaC1 will be 0.0196 0.1 0.01 0.2

Problem 41 If 90Th228 disintegrates to 83Bi212, then the number of α and β particles emitted is 4 α only 4 α and 1β 4 α and 7β 7β only

Problem 42 The reaction N2O5 in CC14(solution) -> 2NO2(solution) + l/2O2(g) is of first order in N2O5 with rate constant 6.2 x 10-4s-1. What is the value of rate of reaction when [N2O5] = 1.25 mole L-1? 5.15 x 10-5 mole L-1S-1 6.35 x 10-3 mole L-1S-1 7.75 x 10-4 mole L-1S-1 3.85 x 10-4 mole L-1S-1

Problem 43 The polymer, which has amide linkage, is Teflon Ethylene Nylon-66 Bakelite

Problem 44 Which one of the following is the strongest acid? CH3COOH CBr3COOH CF3COOH CC13COOH

Problem 45 The correct order of the increasing ionic character is BeC12 < BaC12 < MgC12 < CaC12 BeC12 < MgC12 < BaC12 < CaC12 BeC12 < MgC12 < CaC12 < BaC12 BaC12 < CaC12 < MgC12 < BeC12

Problem 46 The reaction of aromatic acyl chloride and phenol in the presence of a base NaOH or pyridine is called Sandmayer's reaction Perkin's reaction Kolbe's reaction Schotten Baumann reaction

Problem 47 If 0.2 gram of an organic compound containing carbon, hydrogen and oxygen on combustion, yielded 0.147 gram carbon dioxide and 0.12 gram water, what will be the content of oxygen in substance? 83.23% 78.45% 73.29% 89.50%

Problem 48 An organic compound (a) reacts with sodium metal and forms (b). on heating with conc. H2SO4, (a) gives diethyl ether. (a) and (b) are CH3OH and CH3ONa C3H7OH and CH3ONa C2H5OH and C2H5ONa C4H9OH and C4H9ONa

Problem 49 The uncertainty in the momentum of an electron is 1.0*x 10-5 kg m.s.-1 The uncertainty in its position will be (h = 6.62 * 10-34 kg. m2.s-10) 5.27 * 10-30 m 1.05 x 10-26 m 1.05 x 10-28 m 5.25 x 10-28 m

Problem 50 A biological catalyst is essentially A carbohydrate An enzyme An amino acid A nitrogen molecule

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AFMC Chemistry 1998

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