AFMC Chemistry 2001

AFMC–Past papers CHEMISTRY - UNSOLVED PAPER - 2001

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 these is a polyamide? Nylon Rayon Orson None of these

Problem . 02 Para and Roth hydrogen differ in Atomic number Atomic mass Spins of proton Number of neutron

Problem . 03 In long form of the periodic table, properties of elements are functions of their Atomic mass Atomic number Number of neutrons None of these

Problem . 04 A mixture of NO2 and N2O4 has a vapour density of 38.3 at 300 K. What is the number of moles of NO2 in 100 g of the mixture? 0.44 4.4 3.4 3.86

Problem . 05 Threshold energy is equal to Activation energy Activation energy - energy of molecules Activation energy + energy of molecules None of these

Problem 06 In which of the following, entropy is increasing? Crystallization of sugar from sugar solution N2 (g) + 3H2(g) ->2NH3 H2 + I2 ->2HI Adding naphthalene to benzene

Problem 07 Adding HCHO to NH3 gives Formic acid HexaMethylenetetramine Methylamide None of these

Problem 08 A solution of HC1 of pH = 6 is diluted 100 times, then It becomes more acidic It becomes neutral It becomes basic Its pH does not change.

Problem 09 NH3 is added to BF3 by Ionic bond Covalent bond Dative bond Molecular bond

Problem 10 Ethanol and diethyl ether have same empirical formula but ethanol has higher boiling point due to Ionic bond Acidic bond Hydrogen bond Covalent bond

Problem 11 Two chemicals having same chemical formula but different arrangement of atoms are called Isotopes Isomers Polymers Espiers

Problem 12 10% of a substance decays in 5 seconds. The approximate amount left after 25 seconds is 10% 40% 60% 75%

Problem 13 Which of these will give green flame colour ? ZnCl2 NaCl BaCl2 CaCl2

Problem 14 When a lead battery discharges, which of these occurs? Pb is formed Sulphuric acid is consumed PbSO4 ->Pb+H2 SO4 PbSO4 + H2 ->Pb + H2SO4

Problem 15 High ionization energy indicates that Atom size is large Atom size is small Atom is metallic Valence electrons are held tightly by the atom

Problem 16 Half-life of a sample is 160 days. After 800 days, 1 gm of the sample will be reduced to 1/2 gm 1/5 gm 1/4 gm 1/32 gm

Problem 17 Organic catalysts differ from inorganic catalysts in Acting at a very high temperature Being proteins Being consumed in the reaction Acting at very low temperature

Problem 18 Which of these is a hypnotic? Metaldehyde Acetaldehyde Paraldehyde None of these

Problem 19 Moderator used in nuclear reactors is Cadmium Heavy water Boron Geranium

Problem 20 Heavy water is obtained by Boiling water Fractional distillation of H2O Prolonged electrolysis of H2O Heating H2O2

Problem 21 Roasting is done in Blast furnace Reverberatory furnace Electric furnace Refractory furnace

Problem 22 When light is incident on a colloidal solution It is absorbed partially It is absorbed completely It is scattered It passes undeviated

Problem 23 Rutherford's experiment proved for the first time the existence of Neutron Nucleus Proton Electron

Problem 24 A reaction is given as 2P + Q —> products. If concentration of O is kept constant and concentration of P is doubled then rate of Reaction is Doubled Halved Quadrupled Remains same

Problem 25 If two solutions have same osmotic pressure then they are called Isotonic Hypotonic Hypertonic None of these

Problem 26 If H2SO4 is added to water, then the solution Shows positive deviation from Raoult's law Shows negative deviation Shows ideal solution properties Is not stable

Problem 27 Aluminum is refined by Baeyer's process Hall's process Hoope's process Serpeck's process

Problem 28 In DNA the nitrogenous bases are attached to each other by Ionic bond Hydrogen bond Covalent bond Van der Waal's forces

Problem 29 This radical can be identified by Borax Bead test Mg2+ Ca2+ Cu+ Cu2+

Problem 30 Pressure is measured by Barometer Anemometer Hygrometer Voltameter

Problem 31 Bond angle in H2O2 is 97° 91° 94.8° 99.8°

Problem 32 The bond formed due to sidewise overlapping of p-orbitals is π-bond -bond π and bond Sometimes π and sometimes bond

Problem 33 The brass utensils are tinned to prevent Corrosion Attack of acids Breakage None of these

Problem 34 The two ice cubes kept pressed against each other, stick to each other due to Intermolecular forces Hydrogen bonding Van der Waal's forces None of these

Problem 35 The potential of a H2 electrode which is dipped in a solution of pH = 10 is Zero 1 V 2 V 0.592 V

Problem 36 Find the potential of a Cu2+ electrode which is dipped in a solution of pH = 5. 0.29 V 0.529 V 5.29 V 0.63 V

Problem 37 According to Avogadro, "under similar conditions of temperature and pressure, equal volumes of all gases contain equal number of “ Electrons Molecules Atoms Ions

Problem 38 Sodium thiosulphate is added in photography to Improve colour of photograph Remove unreactedAgBr Form latent image To form a better picture

Problem 39 Ionic bond formation between A and B can take place only if Ionisation energy of A is less and electron affinity of B is more If ionisation energy of both A and B is more Both have equal electron affinities None of these

Problem 40 Metallic crystalline solids have Low melting point and boiling point Are bad conductors Are good conductors of heat and electricity Only conduct heat

Problem 41 If 1 litre of N2 is mixed with 2 litres of O2 , quantity explaining it is Kinetic energy Partial pressure Rate of diffusion None of these

Problem 42 CH3OH is more polar than corresponding ether Covalent bond H-bond Van der Waal None of these

Problem 43 Which is more basic? Benzylamine Aniline Acetamide None of these

Problem 44 Cellulose is a Hexapolysaccharide Pentapolysaccharide Tripolysaccharide None of these

Problem 45 Molten NaCI results in conduction because of Free electrons Ions Molecules Anions

Problem 46 Emulsifier helps in Stabilising the emulsion Destabilising the emulsion Forming the emulsion Breaking the emulsion

Problem 47 Which of the following is not true about vitamins? They were named by Funk. They are vital for life. Their deficiency causes diseases. They help in digestion

Problem 48 Alcohol that is used in a beverage is Propanol Butanol Ethanol Methanol

Problem 49 At 25°C the pH value of a solution is 6, then the solution is Acidic Neutral Basic Alkaline

Problem 50 The temperature above which a gas cannot be liquefied is called as Inversion temperature Critical temperature Neutral temperature Curie point

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AFMC Chemistry 2001

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AFMC Chemistry 2001