AFMC Chemistry 1994

AFMC–Past papers CHEMISTRY - UNSOLVED PAPER - 1994

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 A catamite reacts with Nabors in the alkaline medium to form CH3CN NH3 CH3CH2NH2 CH3NH2

Problem 02 Fischer – Tropic process is used in the manufacture of Ethnic acid Ethanol Synthetic petrol Benzene

Problem 03 A violet color with sodium nitroprusside in the test of sculpture in organic compound is due to the formation of Na2[Fe(CN)5S] Na4[Fe(CN)5NOS] Na2[Fe(NO)(CN)5] Na3[Fe(CN)6]

Problem 04 When acetylene is hydrated in the presence of 42% H2SO4 containing mercuric sulphate at 330-370 K product obtained is Methyl chloride Chloride Formaldehyde Acetaldehyde

Problem 05 Starch is converted into maltose by the Sybase Maltase Diastase Inverts

Problem 06 The reaction HCHO + CH3MgI intermediate X. The compound X is CH3COCH3 CH3OH CH3OCH3 CH3CH2OH

Problem 07 The turbidity of a polymer solution measures the Light scattered by the solution Light absorbed by the solution Light transmitted by the solution All of these

Problem 08 The solubility product of a sparingly soluble salt AB at room temperature is 1.21 X 10-6. Its molar solubility is The solubility product of a sparingly soluble salt AB at room temperature is 1.21 X 10-6. Its molar solubility is 1.1 X10-3 mol L-1 1.21 X 10-6 mol L-1 1.01 X 10-3 mol L-1 1.1 X 10-4 mol L-1

Problem 09 Melting point is the highest for Ga B In Al

Problem 10 At equilibrium the value of change in Gibb’s free energy (∆G) is Zero Positive Negative Either (b) or (C)

Problem 11 Which of the following is a polar compound? C2H6 CH4 HCI CCL4

Problem 12 Living in the atmosphere of CO is dangerous because it Combines with O2 present inside to form CO2 Reduces organic matter of tissues Combines with hemoglobin and makes it incapable to absorb oxygen Dries up the blood

Problem 13 Isotonic solutions have the same Normality Density Molar concentration Morality

Problem 14 Which of the following elements always contain -1 oxidation state? Fluorine Carbon Nitrogen Oxygen

Problem 15 When ethyl chloride and alcoholic KOH are heated the compound obtained is C2H5OC2H5 C2H4 C2H6 C2H5OH

Problem 16 Soaps can be classified under Organic compounds Ether Salts of fatty acids Carbohydrates

Problem 17 Which of the following fives purple color to the flame test? Strontium Calcium Sodium Barium

Problem 18 Which of the following has zero valence? He H O Na

Problem 19 The strongest reducing agent is HCl HF HBr HI

Problem 20 Isoprene is used for the preparation of Teflon Rubber Nylon 66 Nylon

Problem 21 The first fractional product of petroleum from top to bottom is Diesel Petrol Petroleum ether Kerosene

Problem 22 Petroleum is a mixture so Alkynes Alkenes Alkyl halides Alkenes

Problem 23 Polyamide is Orson Nylon Teflon Ethylene

Problem 24 Ethan amide is Amphoteric Acidic Neutral Basic

Problem 25 Chromium has the most stabl oxidation state +2 +5 +4 +3

Problem 26 Gammexene is the name of Chlorobenzene DDT Benzene hexachloride Benzoyl chloride

Problem 27 In the titration of strong acid and weak base, the indicator used is Thyme phthalein Methyl orange Thyme blue Phenolphthalein

Problem 28 Complex ion is shown by Cu Ag Au All of these

Problem 29 Which of the following is electron deficient? PC15 BC13 NH3 PC13

Problem 30 Aniline is purified by Fractional distillation Distillation Vacuum distillation Steam distillation

Problem 31 Ethyl alcohol reacts with thinly chloride in the presence of pyridine to give CH3CH2C1+H20+SO2 CH3CH2C1+HC1 CH3CH2C1+HC1+SO2 CH3CH2CH1+SO2+C12

Problem 32 Vinegar contains how much percentage of acetic acid? 90-100% 10-12% 90-98% 7-8%

Problem 33 When oxalic acid is dehydrated by conc. H2SO4, then it forms CO2 C+CO2 CO + CO2 CO

Problem 34 What is formed when formaldehyde reacts with KOH? Ethyl alcohol Methanol Acetylene Methane

Problem 35 If the hydrogen ion concentration of an acid decreases 10 times, its pH value Remains unchanged Increases by one Increases by 10 Decreases by one

Problem 36 Which of the following has highest pH value with water? NaHCO3 NaC1 KC1 Na2CO3

Problem 37 Hydrolysis of ester in an alkaline medium is First order reaction with molecularity two First order reaction with molecularity one Second order reaction with molecularity one Second order reaction with molecularity two

Problem 38 If the rate of diffusion os A is 5 times that of B, what will be the density ratio of A and B? 25 1/25 5 1/5

Problem 39 Which of the following is the most polarized among nobel gases? Kr He Rn Xe

Problem 40 CO2 is obtained by heating NaHCO3 Na2CO3 MgCO3 K3CO3

Problem 41 What is formed when, in the presence of alkali, chloroform is treated with acetone? Carbon tetrachloride Chloretone Chlorobenzene Chloral

Problem 42 Which gas is formed when CaC2 reacts with H2O? Acetylene Methane Ethylene Ethane

Problem 43 Pure nascent hydrogen is best obtained by Na and C2H5OH A1 and NaOH Zn and dil H2SO4 All of these

Problem 44 Hydrogen can not be obtained by Mg + H2SO4 Mg+H2O Zn+dil.H2SO4 Zn+dil.HNO3

Problem 45 Which of the following phenomenon will occur when two atoms of same spin will react? Bonding will occur Bonding will not occur Orbital overlap will not occur Both (B) And (C)

Problem 46 Which of the following is the lightest metal? Cu Li Au Fe

Problem 47 Melting point is the lowest for Ca Be Sr Mg

Problem 48 The unit of a first order rate constant is S-1 Mol m-3s-1 Litre mol-1s-1 M mol-1s-1

Problem 49 Arrange in the increasing order of ionic radii of following elements O, F, CI, Br F,CI,BR,O F,O,CI,BR O,F,CI,Br F,O,Br,CI

Problem 50 Atomic number is equal to The sum of number of neutrons and protons Number of neutrons in the nucleus Atomic weight of element Number of protons in the nucleus

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AFMC Chemistry 1994

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AFMC Chemistry 1994