AIPMT Chemistry 1996

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aipmt–Past papers: 

aipmt–Past papers CHEMISTRY- UNSOLVED PAPER - 1996

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 .

Problem: 

01 Electrophile in the case of chlorination of benzene in the presence of FeCl 3 is Cl FeCl 3 Cl + Cl - . Problem

Problem: 

Problem 02 The bond length between hybridized carbon atom and other carbon atom is minimum in Propene Propyne Propane Butane.

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Problem 03 An aniline on nitration gives a. b. c. d. Both ‘a’ and ‘c’

Problem: 

Problem 04 The reaction CH 2 = CH – CH 3 + HBr → H 3 CHBr-CH 3 is Electrophonic substitution Free radical addition Nucleophilic addition Electrophilic addition

Problem: 

Problem 05 Which of the following has zero dipole moment? 1-butene 2-methyl, 1-propene cis 2-butene trans 2-butene.

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Problem 06 A transition element X has a configuration ( Ar ) 3d 4 in its + 3 oxidation state. Its atomic number is 32 19 25 26.

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Problem 07 Which of the following bonds has the highest energy? S – S O– O Se – Se Te – Te.

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Problem 08 The basic character of hydrides of the Vth group elements decreases in the order NH 3 > PH 3 > AsH 3 > SbH 3 SbH 3 > AsH 3 > PH 3 > NH 3 SbH 3 > PH 3 > AsH 3 > NH 3 NH 3 > SbH 3 > PH 3 > AsH 3 .

Problem: 

Problem 09 Boron compounds behaves as Lewis acids, because of their Ionization property Electron deficient nature Acidic nature Covalent nature.

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Problem 10 When calomel reacts with NH 4 OH, we get Hg 2 O HgO HgNH2Cl NH2 –Hg –Hg-Cl.

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Problem 11 The equation constant for the reaction N 2 + 3H 2 2NH 3 is K, then equilibrium constant for the equation is a. b. c. d.

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Problem 12 The relationship between osmotic pressure at 273 K when 10 gm glucose (p 1 ), 10 gm urea (p 2 ), and 10 gm sucrose (p 3 ) are dissolved in 250 ml of water is p 2 > p 1 > p 3 p 2 > p 3 > p 1 p 1 > p 2 > p 3 p 2 > p 1 > p 2.

Problem: 

Problem 13 Which of the following ion is the largest in size? K + Ca 2+ Cl - S -2 .

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Problem 14 Reaction of sodium thiosulphate with iodine gives Tetrathionate ion Sulphide ion Sulphate ion Sulphite ion.

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Problem 15 Among the following oxides, the lowest acidic is As 4 O 6 As 4 O 10 P 4 O 6 P 4 O 10 .

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Problem 16 Which of the following compound gives benzoic acid on hydrolysis? Chlorobenzene Benzoyl chloride Chlorophenol Chlorotoluene .

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Problem 17 Which of the following mixture of gases does not obey Dalton’s Law of partial pressure? Cl 2 and SO 2 CO 2 and He O 2 and CO 2 N 2 and O 2 .

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Problem 18 What will be the longest wavelength line in Ballmer series of spectrum? 546 nm 656 nm 566 nm 556 nm

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Problem 19 The ionic product of water at 25 0 C is 10 -14 . Its ionic product at 90 0 C will be 1 x 10 -14 1 x 10 -16 1 x 10 -20 1 x 10 -12

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Problem 20 Aldol condensation will not take place in CH 3 CHO CH 3 COCH 3 HCHO CH 3 CH 2 CHO.

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Problem 21 The oxidation of toluene to benzaldehyde by chromyl chloride is called Etard reaction Riemer-Tiemann reaction Wurtz reaction Cannizzaro’s reaction

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Problem 22 The structure and hybridization of Si (CH 3 ) 4 is Octahedral, sp 3 d Tetrahedrial , sp 3 Bent, sp Trigonal , sp 2 .

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Problem 23 Reduction potential for the following half-cell reactions are The EMF for the cell reaction will be -032 V + 1.20 V -1.20 V + 0.32 V.

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Problem 24 Which of the following has the greatest electron affinity? I Br F Cl.

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Problem 25 Which of the following is the correct equation? U = W + Q U = Q – W W = U + Q none of these.

Problem: 

Problem 26 An element (atomic mass = 100 mg/mol) having BCC structure has unit cell edge 400 pm. The density of element is 7.289 gm/cm 3 2.144 gm/cm 3 10.376 gm/cm 3 5.188 gm/cm 3 .

Problem: 

Problem 27 KMnO 4 reacts with oxalic acid according to the equation Here 20 ml of 0.1 M KMnO 4 is equivalent to 50 ml of 0.5 M C 2 H 2 O 4 20 ml of 0.1 M C 2 H 2 O 4 20 ml of 0.5 M C 2 H 2 O 4 50 ml of 0.1 M C 2 H 2 O 4

Problem: 

Problem 28 The number of isomers in C 4 H 10 O will be 7 8 5 6

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Problem 29 Which of the following represents calcium chlorite? Ca(ClO 3 ) 2 Ca(ClO 2 ) 2 CaClO 2 Ca(ClO 4 ) 2 .

Problem: 

Problem 30 If If α is dissociation constant, then the total number of moles for the reaction 2 HI = H 2 + I 2 will be 1 1- α 2 2-α

Problem: 

Problem 31 The IUPAC name of (CH 3 ) 2 CH-CH 2 -CH 2 Br is 1-bromo and 3-methyl butane 2-methyl and 3-bromo propane 1-bromo pentane 2-methyl and 4-bromo butane.

Problem: 

Problem 32 The amount of zinc required to produce 224 ml of H2 at STP on treatment with dilute H 2 SO 4 will be 65 gm 0.065 gm 0.65 gm 6.5 gm.

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Problem 33 The pH value of N/10 NaOH solution is 12 13 10 11.

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Problem 34 Which of the following is not a Lewis acid? SiF 4 C 2 H 4 BF 3 FeCl 3 .

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Problem 35 When a few typical solutes are separated by a particular selective membrane such as protein particles, blood corpuscles, this process is called Transpiration Endosmosis Dialysis Diffusion.

Problem: 

Problem 36 A 5 ampere current is passed through a solution of zinc sulphate for 40 minutes. The amount of zinc deposited at the cathode is 0.4065 gm 65.04 gm 40.65 gm 4.065 gm.

Problem: 

Problem 37 If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur? n-type semiconductor p-type semiconductor both (a) and (b) none of these.

Problem: 

Problem 38 A colloidal system has particles of which of the following size? 10 -9 m to 10 -12 m 10 -6 m to 10 -9 m 10 -4 m to 10 -10 m 10 -5 m to 10 -7 m

Problem: 

Problem 39 The vapour pressure of CCl4 at 25 0 C is 143 mm Hg. If 0.5 gm of a non-volatile solute (mol. Weight = 65) is dissolved in 100 ml CCl 4 , the vapour pressure of the solution will be 199.34 mm Hg 143. 99 mm Hg 141.43 mm Hg 94. 39 mm Hg.

Problem: 

Problem 40 What is the morality of H 2 SO 4 solution, that has a density 1.84 gm/cc at 35 0 C and contains 98% by weight ? 18.4 M 18 M 4.18 M 8.14 M.

Problem: 

Problem 41 The given reaction is an example of Third order reaction First order reaction Second order reaction None of these.

Problem: 

Problem 42 0.24 gm of a volatile gas, upon vaporization, gives 45 ml vapour at NTP. What will be the vapour density of the substance? (Density of H 2 = 0.089) 95. 93 59.93 95.39 5.993

Problem: 

Problem 43 The average kinetic energy of an ideal gas, per molecule is S.I. units, at 25 0 C will be 6.17 x 10 -20 J 7.16 x 10 -20 J 61.7 x 10 -21 J 6.17 x 10 -21 J

Problem: 

Problem 44 The F.C.C. crystal contains how many atoms in each unit cell? 6 8 4 5

Problem: 

Problem 45 At what temperature, the rate of effusion of N 2 would be 1.625 times than the rate of SO 2 at 500 0 C ? 373 0 C 620 0 C 110 0 C 173 0 C

Problem: 

Problem 46 Which of the following has sp 2 -hybridisation? BeCl 2 C 2 H 2 C 2 H 6 C 2 H 4 .

Problem: 

Problem 47 In a Bohr’s model of an atom, when an electron jumps from n = 1 to n = 3, how much energy will be emitted or absorbed? 2.389 x 10 -12 ergs 0.239 x 10 -10 ergs 2.15 x 10 -11 ergs 0.1936 x 10 -10 ergs

Problem: 

Problem 48 The electronic configuration of transition elements is exhibited by ns 1 ns 2 np 5 ns 2 (n - 1)d 1-10 ns 2 (n - 1)d 10 .

Problem: 

Problem 49 Which of the following is used as an anti-knocking material ? Glyoxalin Freon T.E.L. Ethyl alcohol.

Problem: 

Problem 50 Which of the following has the smallest size? Al 3+ F - Na + Mg 2+

Slide 53: 

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