AFMC Chemistry -2010

AFMC–Past papers: 

AFMC–Past papers CHEMISTRY - UNSOLVED PAPER - 2010

SECTION – I (Total Marks :50): 

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

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01 Least volatile hydrogen halide is HF HC1 HI HBr Problem

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Problem 02 Which of the following has the highest electron affinity ? F - O - O Na

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Problem 03 Highest oxidation state of Mn is present in MnO 4 K 2 MnO 4 Mn 2 O 3 MnO 2

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Problem 04 Maximum number of H-bonds in one molecule of water is 1 2 3 4

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Problem 05 Among the given compounds, one which can be distinguished by AgNO 3 is Ethane Ethylene Acetylene Diethyl ether

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Problem 06 Oxalic acid on heating with conc. H2SO 4 gives CO only CO 2 only CO 2 + H 2 O CO + CO 2 + H 2 O

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Problem 07 Violet coloured complex obtained in the detection of sulphur is Na 2 [Fe(NO)(CN) 5 ] Na 3 [Fe( ONSNa )(CN) 5 ] Na 4 [Fe(CN) 5 NOS] Both (b) & (c)

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Problem 08 Deuterium nucleus contains 1p + 1n 2p + 0n 1p + 1e - 2p + 2n

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Problem 09 In an organic compound, phosphorus is estimated as Mg 2 P 2 O 7 Mg 3 (PO 4 ) 2 H 3 PO 4 P 2 Os

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Problem 10 No. of atoms present in 4.25 g of NH 3 is 6.023 * 10 23 4 * 6.023 *10 23 1.7 * 10 24 4.25 * 6.023 * 10 23

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Problem 11 Chemical formula of phosgene is COCl 2 CaOCl 2 CaCo 3 COC1

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Problem 12 IUPAC nomenclature of Image* 2,4,4-trimethylpent-2-ene 2,4,4-trimethylpent-3-ene 2,2,4-trimethylpent-3-ene 2,2,4-trimethylpent-2-ene

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Problem 13 If 1 ml of water contains 20 drops. Then no. of molecules in a drop of water is 6.023 x 10 23 molecules 1.376 x 10 26 molecules 1.344 x 10 18 molecules 4.346 x 10 20 molecules

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Problem 14 Chemical formula of Prussian blue is Na 4 [Fe(CN 6 )] K 4 [Fe(CN 6 )] Fe 4 [Fe(CN) 6 ] 3 None of these

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Problem 15 Pb + Cone. HNO 3 gives Pb (NO 3 ) 2 + NO 2 PbNO 3 + NO Pb (NO 3 ) 4 + NO 3 Pb (NO 3 ) 3 + N 2 O

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Problem 16 N 2 .gas will not be evolved upon reaction of HNO with which of the following amines ? 1° 2° 3° Both (b) and (c)

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Problem 17 Which of the following carbonates is the most stable ? MgCO 3 CaCO 3 SrCO 3 BaCO 3

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Problem 18 100 ml of HG1 + 35 ml of NaOH , colour of methyl orange in the solution will be Red Yellow Can't be predicted Methyl orange is not a suitable indicator

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Problem 19 No. of acyclic isomers of the compound having the molecular formula C 4 H 10 O is 4 6 5 7

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Problem 20 Given The heat of formation of NC 3(g) in terms of AH,, ∆H 2 and ∆H 3 is None of the above

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Problem 21 At 18°C, the conductance of H + and CH 3 COO- at infinite dilution are 315 and 35 mho cm 2 eq -1 respectively. The equivalent conductivity of CH 3 COOH at infinite dilution is……….. mho cm 2 350 280 30 315

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Problem 22 How many moles of iodine are liberated when 1 mole of potassium dichromate reacts with potassium iodide? 1 2 3 4

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Problem 23 Pure benzene freezes at 5.3°C. A solution of 0.223 g of phenylacetic acid (C 6 H 5 CH 2 COOH) in 4.4 g of benzene (KF = 5.12 K kg mol-1) freezes at 4.47°C. From this observation, one can conclude that phenylacetic acid exists as such in benzene phenylacetic acid undergoes partial ionization in benzene phenylacetic acid undergoes complete ionization in benzene phenylacetic acid dimerizes in benzene.

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Problem 24 In the following re action, the product 'R' is benzene ethylbenzene toluene n- propylbenzene

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Problem 25 Bromine water reacts with SO 2 to form HBr and S H 2 o and HBr S and H 2 Q H 2 SO 4 and HBr

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Problem 26 Which of the following transition metal ions is not coloured ? Cu + V 3+ Co 2+ Ni 2+

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Problem 27 The reaction, N 2 O 5 in CCl 4 (solution)→2NO 2 (solution) + l/2O 2 (g) is of first order in N 2 O 5 with rate constant 6.2 * 10 -4 What is the value of rate of reaction when [N 2 O 5 ] = 1.25 mole L -1 ? 5.15 l0 -5 mole L -1 s -1 6.35 * 10 -3 mole L -1 s -1 7.75 * 10 -4 mole L -1 s -1 3.85 * 10 -4 mole L -1 s -1

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Problem 28 A developer used in photography is a weak acid a weak base a mild reducing agent an oxidizing agent

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Problem 29 If 1 mole of an ideal gas expands isothermally at 37°C from 15 litres to 25 litres , the maximum work obtained is 12.87 J 6.43 J 8.57 J 2.92 J

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Problem 30 The shape of IF7 molecule is octahedral trigonal bipyramidal tetrahedral pentagonal bipyramidal

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Problem 31 Hydrolysis of sucrose is called inversion esterification hydration saponification

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Problem 32 What will be the partial pressure of He and O 2 respectively, if 200 ml of He at 0.66 atm and 400 ml of O 2 at 0.52 atm pressure are mixed in 400 ml vessel at 20°C ? 0.33 and 0.56 0.33 and 0.52 0.38 and 0.52 0.25 and 0.45

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Problem 33 In which process, fused sodium hydroxide is electrolysed for extraction of sodium? Castner's process Cyanide process Down's process Both (b) and (c)

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Problem 34 At room temperature, the eclipsed and staggered forms of ethane cannot be isolated because they interconvert rapidly both the conformers are equally stable the energy difference between the conformers is large there is a large energy barrier of rotation about the a bond

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Problem 35 In an experiment, 4 g of M 2 O x oxide was reduced to 2.8 g of the metal. If the atomic mass of the metal is 56 g mol-1, the number of O atoms in the oxide is 1 2 3 4

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Problem 36 Hydrolysis of trichloromethane with aqueous KOH gives Methanol acetic acid ethanol formic acid

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Problem 37 Primary, secondary and tertiary amines can be distinguished by Schiff's test Fehling's test Tollen's test Hinsberg test

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Problem 38 In the complex ion [Co(NH 3 ) 6 ] 3+ , the NH 3 molecules are linked to the central metal ion by ionic bonds covalent bonds coordinate bonds hydrogen bonds

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Problem 39 The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25°C increases the temperature of 18.94 kg of water by 0.632°C. If the specific heat of water at 25°C is 0.998 cal/g-deg, the value of the heat of combustion of benzoic acid is 881.1 kcal 771.4 kcal 981.1 kcal 871.2 kcal

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Problem 40 When ethanal is treated with Fehling's solution, it gives a precipitate of Cu 2 0 Cu Cu 3 0 CuO

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Problem 41 The electronegativity of the following elements increases in the order C, N, Si, P N, Si, C, P Si, P, C, N P, Si, N, C

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Problem 42 Permanent hardness of water can be removed by adding Na 2 CO 3 K Ca(OC1)C1 Cl 2

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Problem 43 The compound containing coordinate bond is SO 3 O 3 H 2 SO 4 all of these

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Problem 44 Which of the following molecules has trigonal planar geometry? BF 3 NH 3 PH 3 IF 3

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Problem 45 Which of the following compounds, on reaction with NaOH and Na 2 O 2 , gives yellow colour ? Zn(OH) 2 Al(OH) 3 Cr(OH) 3 CaCO 3

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Problem 46 The major organic product formed from the following reaction Image*

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Problem 47 If 1,3-dibromopropane reacts with zinc and Nal , the product obtained is propene propane cyclopropane hexane

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Problem 48 In the equation; 4M + 8CN + 2H 2 O + O 2 →4[M(CN) 2 ]+4OH Identify the metal M. It is Copper Iron Gold Zinc

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Problem 49 Ammonia, on reaction with excess of chlorine, gives NC1 3 and HC1 N 4 and NH 4 C1 NC1 3 and NH 4 C1 N 2 and HC1

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Problem 50 If the supply of oxygen is limited, H 2 S reacts with O 2 to form H 2 O + SO 3 H 2 SO 4 + S H 2 O + S H 2 O + SO 2

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