AFMC Chemistry 2002

AFMC–Past papers CHEMISTRY - UNSOLVED PAPER - 2002

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 Which of the following compound will give positive test with Toller's reagent? Ace amide Acetone Acetic acid Acetaldehyde

Problem 02 Which of the following is the strongest Bronzed base? ClO- CIO-4 CIO-3 CIO-2

Problem 03 The complex salt can be made by the combination of [Co111(NH3)5Cl]x with PO3-4 2K+ 2C1- CI-

Problem 04 The reaction of an aldehyde with hydroxylamine gives a product which is called Aldoxime Aminohydroxide Semi carbazone Hydrazone

Problem 05 The half-life period of a radioactive substance is 140 days. After how much time 15g will decay from 16 g sample of it? 140 days 560 days 280 days 420 days

Problem 06 The unit of rate constant for the first order reaction is sec-1 mol, ltr-1 mol, ltr. sec-1 All of these

Problem 07 The charge of an electron is -1.6 x 10-19 C. The value of free charge on Li+ ion will be 3.6 x 10-19 C 1 x 10-19C 1.6 x l0-19 C 2.6 x 10-19 C

Problem 08 The maximum valency of an element with atomic number 7 is 2 5 4 3

Problem 09 How many grams of CaCO3 will give 56 g of CaO? 120 g 56 g 100 g 112 g

Problem 10 Which of the following has the same mass as that of an electron? Photon Neutron Positron Proton

Problem 11 The chloramphenicol is an example of Antibiotic Sulpha drug Antiseptic Antipyretic

Problem 12 The metal present in vitamin B12 is Iron Manganese Magnesium Cobalt

Problem 13 Terylene is used for making Sails Fabrics Seat belts All of these

Problem 14 The bad smelling substance, formed by the action of alcoholic caustic potash on chloroform and aniline, is Nitrobenzene Phenyl isocyanate Phenyl isocyanide Phenyl cyanide

Problem 15 According to the nuclear reaction : 4Be + 2He4->6C12 + On1 mass no. of (Be) atom is 4 9 7 6

Problem 16 Which of the following is called laughing gas? Nitric oxide Dinitrogen pent oxide Dinitrogen trioxide Nitrous oxide

Problem 17 ZnO when heated with BaO at 1100°C gives a compound, identify the compound BaZnO2 BaO2 + Zn BaCdO2 Ba+ZnO2

Problem 18 For a cell, the cell reaction is Mg(5) + Cu2+(aq)->Cu(5)+Mg2+(aq) If standard reduction potentials of Mg and Cu are -2.37 and +0.34 V, the e.m.f. of the cell is 2.03 V -2.71 V 2.71 V -2.03 V

Problem 19 In the metallurgy of zinc, the zinc dust obtained from roasting contains some zinc oxide. How is this removed? Smelting is employed Shock coding with a shower of lead Absorbance of UV light X-ray method is used

Problem 20 When chloroform is exposed to air the compound formed is Phosgene Chloral Acetyl chloride All of these

Problem 21 In an isobaric process, the ratio of heat supplied to the system (dQ) and work done by the system (dW) for diatomic gas is 1 : 1 7 : 2 7 : 5 5 : 7

Problem 22 Equal volumes of monoatomic and diatomic gases at same initial temperature and pressure are mixed. (The ratio of specific heats of the mixture will be 1 2 1.67 1.5

Problem 23 If the rate of diffusion of CH4 is twice of that of a gas X, then what is the molecular mass of the gas XI 32 96 80 64

Problem 24 The shape of IF, molecule is Octahedral Pentagonal bipyramidal Trigonalbipyramidal Tetrahedral

Problem 25 What is the value of carbonate hardness of water sample if 100 ml of it took 5 ml of 0.09 N HC1 solution? (Molecular weight of Na2CO3 = 106) 4.50 mg-eq/ltr. 1.80 mg-eq/ltr. 0.042 mg-eq/ltr. 477.00 mg-eq/ltr.

Problem 26 The rate of a chemical reaction depends upon Time Pressure Concentration All of these

Problem 27 Which of the following shows electrical conduction? Sodium Potassium Diamond Graphite

Problem 28 The maximum number of hydrogen bonds formed by a water molecule in ice is 4 1 2 3

Problem 29 The homologue of ethylene is C2H2 C3H4 C3H8 C3H6

Problem 30 The extraction of IA and I1A group metals is done by Carbon reduction Aluminothermic process Metal displacement Electrolytic reduction

Problem 31 In laboratory, silicon can be prepared by heating Silica with magnesium Carbon in electric furnace Potassium with fluorine None of these

Problem 32 The element having atomic number. 56 belongs to Actinides Alkaline earth metals Transition series Lanthanides

Problem 33 For I = 3, the corresponding values of magnetic quantum numbers would be - 1, - 2, - 3 0, ±1, ±2, ±3 ±1, ±2, ±3 0, +1, +2, + 3

Problem 34 Which of the following is an alicyclic compound? Benzene Furan Cyclohexane Hexane

Problem 35 The interatomic distances in H2 and Cl2 molecules are 74 and 198 Pm respectively. The bond length of HC1 is 124 Pm 248 Pm 272 Pm 136 Pm

Problem 36 The process of heating steel and then suddenly cooling it is known as Annealing Case-hardening Tampering Hardening

Problem 37 The electronic configuration of Mn2+ ion in its ground state is 3d54s0 3d24s24p2 3d34s2 3d44s1

Problem 38 The shape of ethylene molecule is Square planar Linear Pyramidal Tetrahedral

Problem 39 An isomer of ethanol is Ethanal Dimethyl ether Diethyl ether Methanol

Problem 40 The indicator used in the titration of iodine against sodium thiosulphate is Starch K3Fe(CN)6 K2CrO4 Potassium

Problem 41 If Na is heated in presence of air, it forms Na2CO3 Na2,O2 Na2O Both (b) and (c)

Problem 42 Which of the following is the most stable harmonium ion among the following? C6H5CH2 CH3CH2 C6H5-CH2CH2 C6H5CHC6H5

Problem 43 When metallic copper comes in contact with moisture, a green powdery/pasty coating can be seen over it. This is chemically known as Copper sulphide - copper carbonate Copper carbonate - copper sulphate Copper carbonate - copper hydroxide Copper sulphate - copper sulphide

Problem 44 Excess of ethanol when heated with concentrated H2S04 at 140°C, the compound obtained is Ethene Ethyl hydrogen sulphate Ethoxy ethane Diethyl sulphate

Problem 45 Carborundum is SiC A1C13 A12(SO4)3 A12O3 . 2H2O

Problem 46 In graphite, carbon atoms are joined together due to Ionic bonding Van derwaal's forces Metallic bonding Covalent bonding

Problem 47 During the electrolysis of an electrolyte, the number of ions produced, is directly proportional to the Time consumed Electro chemical equivalent of electrolysis Quantity of electricity passed Mass of electrons

Problem 48 The positive charge of an atom is Spread all over the atom Distributed around the nucleus Concentrated at the nucleus All of these

Problem 49 Which of the following is called laughing gas? Nitric oxide Dinitrogen pen oxide Dinitrogen trioxide Nitrous oxide

Problem 50 The hybridization of carbons of C—C single bond of HC=C—CH=CH2 is sp3 — sp3 sp - sp2 sp3 – sp sp2 -sp3

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AFMC Chemistry 2002

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