AFMC Chemistry 1999

AFMC–Past papers CHEMISTRY - UNSOLVED PAPER - 1999

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 The reaction CH2 = CHCH3 + HBr -> CH3CHBrCH3, is a type of Free radical addition reaction Electrophilic substitution reaction Electrophilic addition reaction Nucleophilic addition reaction

Problem 02 Which of the following set has the strongest tendency to form anions? Ga, In and T Na, Mg and A1 N, O and F V, Cr and Mn

Problem 03 Baeyer's reagent is used in the laboratory for Oxidation process Detection of glucose Detection of double bond Reduction process

Problem 04 Oxidation of acetaldehyde with selenium dioxide produces Glyoxal Oxalic acid Ethanoic acid Methanoic acid

Problem 05 Which of the following is the most stable oxidation state of aluminium? +2 +1 -1 +3

Problem 06 When acetylene reacts with arsenic trichloride in the presence of anhydrous aluminium chloride, it produces Nitrobenzene P-chlorovinyidichloroarsinc Lewisite Both (b) and (c)

Problem 07 Emery consists of Purest form of iron Impure corundum Impure carborundum Impure graphite

Problem 08 Which of the following is the monomer of natural rubber? Isoprene Adipic acid Glycol Ethylene

Problem 09 The structure of DNA is Triple helix Linear Single helix Double helix

Problem 10 Which of the following statements is true for fuel cells? They are free from pollution They run till the reactant are active They are more efficient All of these

Problem 11 Chloroform on treatment with concentrated HN03 , gives CHCl2NO3 CHCIHNO3 CHC12NO2 CC13NO2

Problem 12 Which of the following will not displace hydrogen? Ba Pb Sn Hg

Problem 13 When primary alcohol is oxidised with chlorine, it gives HCHO CH3CHO CC13CHO C3H7CHO

Problem 14 The Beilstein test for organic compounds is used to detect Carbon Halogens Nitrogen Sulphur

Problem 15 In the reaction HN03 + P4O10 4HPO3 + X, the product X is N2O5 H2O NO2 N2O3

Problem 16 The oxidation of toluene to benzaldehyde by chromyl chloride is called Etard reaction Fittig reaction Rosenmund reaction Wurtz reaction

Problem 17 Which of the following halogen is solid at room temperature? Iodine Bromine Fluorine Chlorine

Problem 18 Heating a mixture of sodium benzoate and soda lime gives Benzene Calcium benzoate Methane Sodium benzoate

Problem 19 Nylon-66 is made by using Adipic acid Succinic acid Phenol Benzaldehyde

Problem 20 Half-life of radium is 1580 years, its average life will be 2.5 x 103 years 2.275 x 103 years 8.25 x 102 years 1.8 x 103 years

Problem 21 Nessler's reagent is represented by K2[HgI4] HgOHgI2 K2[HgI2] Hgl2

Problem 22 Which of the following has the highest boiling point? n-octane Butane Pentane Ethane

Problem 23 Which of the following is the most electronegative? Co Cu Ni Fe

Problem 24 The half-life of 6C14 if its decay constant (λ) is 2.31 x 10-4 is 3.5 x 104 year 3 x 103 year 2 x 102 year 4 x 103 year.

Problem 25 The de-Broglie wavelength of a particle with mass 1 g and velocity 100 m/s is 6.63 x 10-33 m 6.63 x 10-34 m 6.63 x 10-35 m 6.65 x 10-35 m.

Problem 26 How many gram of dibasic acid (molecular weight = 200) should be present in 100 ml of the aqueous solution to give strength 0.1 N? 2g 1g 5g 10g

Problem 27 Boiling point of chloroform was raised by 0.323 K, when 0.5143 g of anthracene was dissolved in its 35 g. Molecular mass of anthracite is {Kb for CHC13 = 3.9 K-kg mol-1) 132.32 g/mol 242.32 g/mol 177.42 g/mol 79.42 g/mol

Problem 28 The oxidation state of chromium in potassium dichromate (K2Cr2O7) is +2 -2 -5 +6

Problem 29 The compound containing co-ordinate "bond is SO3 H2SO4 O3 All of these

Problem 30 The correct order of reactivity of halogen is F > CI > Br > I F < CI < Br < I F < CI > Br > I F > CI < Br < I

Problem 31 Ratio of the energy of a photon of wavelengths 3000 A and 6000 A is 1 : 2 1 : 3 3 : 1 2 : 1

Problem 32 In the manufacture of NH3, the most favorable condition is Low temperature and high pressure High temperature and low pressure High temperature and high pressure High temperature and low pressure

Problem 33 The molecular formula of crinoline is Na3AlF6 Na2Al2O3 Fe3O4 All of these

Problem 34 Calcium format, on dry heating, yields Acetic acid Acetaldehyde Acetone Formaldehyde

Problem 35 Carnalite has which of the following composition? Fe3O4 Na3AlF6 KCl-MgCl2-6H2O Na2AlF5

Problem 36 The acid formed, when iodine reacts with concentrated nitric acid, is Iodic acid Nitrous acid Hydroiodic acid Per-iodic acid

Problem 37 Magnetic quantum number specifies Size of orbitals Shape of orbital Nuclear stability Orientation of orbitals

Problem 38 According to Bohr's theory of hydrogen atom, which of the following is quantised for an electron? Acceleration Velocity Angular momentum Angular acceleration

Problem 39 The volume of a gas measured at 27°C and 1 atm pressure is 10 litres. What final temperature would be required to reduce the volume to 5 litres at 1 atm pressure? 450 K 100°C 150 K 327 K

Problem 40 The number of electrons in [19K40]-1 is 18 19 20 40

Problem 41 Aufbau principle is obeyed in which of the following electronic configurations? Is2 2s22p6 Is2 3p6 3s2 1s2 3s23p6 Is2 2s2 3s2

Problem 42 Which of the following substances is used, in laboratory, for fast drying of neutral gases? Phosphorus pent oxide Anhydrous calcium chloride Active charcoal Sodium phosphate

Problem 43 In which of the following hydrocarbons, hydrogen is most acidic? CH2 = CH2 CH = CH CH3 - CH3 None of these

Problem 44 Tyndall effect can be observed in a Solvent Precipitate Colloidal solution Solution

Problem 45 A base, as defined by Bronzed theory, is a substance which can Gain a pair of electrons Accept protons Lose a pair of electrons Donate protons

Problem 46 In the preparation of sulphuric acid, V205 is used in the reaction. It is N2 + 3H2-> 2NH3 2SO2 + O2 -> 2SO3 SO2 + H2O ->H2SO4 S + O2 ->S02

Problem 47 Empirical formula of a compound is CH2O. If its molecular weight is 180, then the molecular formula of the compound is C3H6O3 C4H8O4 C6H12O C5H10O5.

Problem 48 The compound CH3 – O-C3H7 and C2H5 - O - C2H5 exhibit Mesmerism Chain isomerism Optical isomerism Cis-trans isomerism

Problem 49 Solutions with same osmotic pressure are called Isotonic Hypertonic Normal None of these

Problem 50 pH value of a solution, whose hydronium ion concentration is 6.2 x 10-9 mol/1 is 7.75 7.21 8.21 6.21

For solution visit www.vasista.net

AFMC Chemistry 1999

Recommandé

Recommandé

Contenu connexe

Tendances

Tendances (19)

En vedette

En vedette (9)

Similaire à AFMC Chemistry 1999

Similaire à AFMC Chemistry 1999 (20)

Plus de Vasista Vinuthan

Plus de Vasista Vinuthan (20)

Dernier

Dernier (20)

AFMC Chemistry 1999