AMU - CHEMISTRY - 2006

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amu –Past papers: 

amu –Past papers CHEMISTRY- UNSOLVED PAPER - 2006

SECTION – I: 

SECTION – I 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

Problem: 

01 Which one of the following is not an amphoteric substance ? HNO 3 HCO H 2 O NH 3 Problem

Problem: 

02 When 50 cm 3 of 0.2 N H 2 SO 4 is mixed with 50 cm 3 of 1 N KOH, the heat liberated is : 11.46 kJ 157.3 kJ 573 kJ 573 J Problem

Problem: 

Problem 03 An artificial radioactive isotope gave N after two successive -particle emissions. The number of neutrons in the parent nucleus must be : 9 14 5 7

Problem: 

Problem 04 Stainless steel does not rust because : Chromium and nickel combine with iron Chromium forms an oxide layer and protects iron from rusting Nickel present in it, does not rust Iron forms a heard chemical compound with chromium present in it

Problem: 

Problem 05 Which of the following combinations can be used to synthesis ethanol ? CH 3 MgI and CH 3 COCH 3 CH 3 MgI and C 2 H 5 OH CH 3 MgI and CH 3 COOC 3 H 5 CH 3 MgI and HCHO

Problem: 

Problem 06 A solution contains 1.2046 x 10 24 hydrochloric acid molecules in one dm 3 of the solution. The strength of the solution is : 6 N 2 N 4 N 8 N

Problem: 

Problem 07 Nuclear theory of the atom was put forward by : Rutherford Aston Neils Bohr J.J. Thomson

Problem: 

Problem 08 In acetylene molecule, the two carbon atoms are linked by : One sigma-bond and two pi-bonds two sigma-bonds and one pi-bond Three sigma-bonds Three pi-bonds

Problem: 

Problem 09 The enthalpy of reaction, is H 1 and that of is H 2 Then : H 1 < H 2 H 1 + H 2 = 0 H 1 > H 2 H 1 = H 2

Problem: 

Problem 10 A radioactive isotope decays at such that a rate that after 192 minutes only 1/16 of the original amount remains left. Its half-life is : 32 min 48 min 12 min 24 min

Problem: 

Problem 11 The pressure and temperature of 4 dm 3 of carbon dioxide gas are doubled, then the volume of carbon dioxide gas would be : 2 dm 3 3 dm 3 4 dm 3 8 dm 3

Problem: 

Problem 12 4 g of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave 5 g of its oxide. The equivalent weight of copper is : 23 32 12 20

Problem: 

Problem 13 In the manufacture of ammonia by Haber’s process, N 2 (g) + 3H 2 2NH 3 (g) + 92.3 kJ which of the following condition is unfavourable ? Increasing the temperature Increasing the pressure Reducing the temperature Removing ammonia as it is formed

Problem: 

Problem 14 The chemical equilibrium of a reversible reaction is not influenced by : Pressure Catalyst Concentration of the reactants Temperature

Problem: 

Problem 15 Cumence process is the most important commercial method for the manufacture of phenol. Cumene is : 1-methyl ethyl benzene ethyl benzene vinyl benzene propyl benzene

Problem: 

Problem 16 The reagent which does not give acid chloride on treating with a carboxylic acid is : PCl 5 Cl 2 SOCl 2 PCl 3

Problem: 

Problem 17 Among the halogens, the one which is oxidized by nitric acid is : Fluorine Iodine Chlorine Bromine

Problem: 

Problem 18 The metal which does not form ammonium nitrate by reaction with dilute nitric acid is : Al Fe Pb Mg

Problem: 

Problem 19 The elements with atomic numbers 9, 17, 35, 53, 85 are all : Noble gases Halogens Heavy metals Light metals

Problem: 

Problem 20 In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to : Minimize the heat loss due to radiation Protect aluminium produced from oxygen Dissolve bauxite and render it conductor of electricity Lower the melting point of bauxite

Problem: 

Problem 21 The number of 2p electrons having spin quantum number s = -1/2 are : 6 0 2 3

Problem: 

Problem 22 Pick out the alkane which, differs fromteh other members of the group : 2,2-dimethyl propane pentane 2-methyl butane 2,2-dimethylbutane

Problem: 

Problem 23 56 g of nitrogen and 8 g of hydrogen gas are heated in a closed vessel. At equilibrium 34 g of ammonia are present. The equilibrium number of moles of nitrogen, hydrogen and ammonia are respectively : 1, 2, 2 2, 2, 1 1, 1, 2 2, 1, 2

Problem: 

Problem 24 A process is taking place at constant temperature and pressure. Then : H = E H = T S H = 0 S = 0

Problem: 

Problem 25 In a galvanic cell, the electrons flow from : Anode to cathode through the solution Cathode to anode through the solution Anode to cathode through the external circuit Cathode to anode through the external circuit

Problem: 

Problem 26 The reaction, 2SO 2 (g) + O 2 (g) 2SO 3 (g) is carried out in a 1 dm 3 vessel and 2 dm 3 vessel separately. The ratio of the reaction velocities will be : 1 : 8 1 : 4 4 : 1 8 : 1

Problem: 

Problem 27 In a mixture of acetic acid and sodium acetate the ratio of concentration of the salt to the acid is increased ten times. Then, the pH of the solution : Increase by one Decreases by one Decreases ten fold Increases ten fold

Problem: 

Problem 28 When a mixture of methane and oxygen is passed through heated molybdenum oxide, the main product formed is : Methanoic acid Ethanal Methanol Methanal

Problem: 

Problem 29 Benzene can be obtained by heating either benzoic acid with X or phenol with Y.X and Y are respectively : Zinc dust and soda lime Soda lime and zinc duct Zinc dust and sodium hydroxide Soda lime and copper

Problem: 

Problem 30 An organic compound is boiled with alcoholic potash. The product is cooled and acidified potash. The product is cooled and acidified with HCl . A white solid separates out. The starting compound may be : Ethyl benzoate Ethyl formate Ethyl acetate Methyl acetate

Problem: 

Problem 31 A nitrogen containing organic compound gave an oily liquid on heating with bromine and potassium hydroxide solution. On shaking the product with acetic anhydride, an antipyretic drug was obtained. The reactions indicate that the starting compound is : Aniline Benzamide Acetamide Nitrobenzene

Problem: 

Problem 32 The silver slat of a fatty acid on refluxing with an alkyl halide gives an : Acid Ester Ether Amine

Problem: 

Problem 33 Pick out the one which does not belong to the family : Pepsin Cellulose Ptyalin Lipase

Problem: 

Problem 34 Which one of the following is wrongly matched ? Saponificaiton of CH 3 COOC 2 H 5 second order reaction Hydrolysis of CH 3 COOCH 3 pseudo unimolecular reaction Decomposition of H 2 O 2 first order reaction Combination of H 2 and Br 2 to give HBr first order reaction

Problem: 

Problem 35 The diameter of colloidal particles range from : 10 -6 m to 10 -9 m 10 -9 m to 10 -12 m 10 3 m to 10 -3 m 10 -3 m to 10 -6 m

Problem: 

Problem 36 On treating a mixture of two alkyl halides with sodium metal in dry ether, 2-methyl propane was obtained. The alkyl halides are : 2-chloropropane and chloromethane 2-chloropropane and chloromethane chloromethane and chloroethane chloromethane and 1-chloropropane

Problem: 

Problem 37 Which of the following statements about benzyl chloride is incorrect ? It is less reactive than alkyl halides It can be oxidized to benzaldehyde by boiling with copper nitrate solution It is a lachrymatory liquid and answers Beilstein’s test It gives a white precipitate with alcoholic silver nitrate

Problem: 

Problem 38 The main product obtained when a solution of sodium carbonate reacts with mercuric chloride is : Hg(OH) 2 HgCO 3 . HgO HgCO 3 HgCO 3 . Hg(OH) 2

Problem: 

Problem 39 In the electrothermal process, the compound displaced by silica from calcium phosphate is : Calcium phosphide Phosphine Phosphorus Phosphorus pentoxide

Problem: 

Problem 40 The enthalpy of combustion of methane at 25 0 C is 980- kJ. The heat liberated when 3.2 g of methane is burnt in air is : 445 kJ 278 kJ -890 kJ 178 kJ

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