IV. Descripción del funcionamiento del Experiment Container Development Kit
IV.2. Conceptos de diseño general de ECDK
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C H E M I S T R Y T O D A Y | DECEMBER '05 47 47
SOLVED PAPER
K E R A L A PMT - 2005
1. The silver salt of an unknown monoacidic alkyne contains 67.08% silver. The structure of the alkyne is (a) H3C - CH2 - C = CH
(b) H3C - C = CH (c) HC = CH (d) H3C - C = C - CH3
(e) either (c) or (d).
2. Match list I with list II and select the correct answer using the code given below the lists.
List I (mixture)
1. o- and p-nitrophenols 2. Naphthalene and urea 3. Heptane and octane 4. Benzene and
nitro-benzene
List II
(method for separation) A. Azeotropic distillation B. Steam distillation C. Simple distillation D. Sublimation E. Gas chromatography Codes :
(a) 1-A, 2-D, 3-E, 4-C (c) 1-B, 2-D, 3-E, 4-C (e) 1-E, 2-D, 3-C, 4-A.
(b) 1-B, 2-D, 3-C, 4-E (d) 1-C, 2-E, 3-D, 4-A
3. 0.4 g of a silver salt of a monobasic organic acid gave 0.26 g pure silver on ignition. The molecular weight of the acid is (atomic weight of silver = 108) (a) 58 (b) 72 (c) 90 (d) 104 (e) 124.
4. Consider the parallel reactions in the electrophilic addition of HBr to propene via the alternative pathways shown below.
path 1 (with peroxide) ^
Propene + HBr
path 2 (without peroxide)
1-bromopropene + 2-bromopropene (4) (S) Identify the wrong statement with reference to the above.
(a) path 1 has predominance of (A) over (B) (b) path 2 has predominance of (B) over (A) (c) path 1 is in accordance with anti-Markownikoff's
rule
(d) path 2 follows Markownikoff's rule
(e) both the paths afford 50% yield of (A) and (B).
5. Relative stabilities of various alkenes represented as R2C = CR2, R2C = CHR, RCH = CHR (trans), RCH — CHR (cis) are in the increasing order of (a) R2C = CR2, R2C = CHR, RCH - CHR (trans),
RCH = CHR (cis)
(b) R2C = CR2, R2C = CHR, RCH = CHR (cis), RCH = CHR (trans)
(c) RHC = CHR (trans), RCH = CHR (cis), R2C = CHR, R2C = CR2
(d) RHC = CHR (cis), R,C = CR2, R2C = CHR, RCH = CHR (trans)
(e) R2C = CR2, R2C = CHR, RCH = CHR (trans), RHC = CHR (cis)
6. Gasoline with an octane number of 90 is equivalent in knocking characteristics to a mixture of heptane and isooctane of the following composition.
(a) 20% heptane + 80% iso octane (b) 90% heptane + 10% iso octane (c) 80% heptane + 20% iso octane (d) 10% heptane + 90% iso octane (e) 5% heptane + 95% iso octane.
7. Consider the following carbocations.
1. C13C+ 2. CI,CH+ 3. C1CH2+ 4. CH3+. The stability sequence follows the order
(a) 4 < 1 < 2 < 3 (b) 1 < 2 < 3 < 4 (c) 4 < 1 < 3 < 2 (d) 4 < 2 < 1 < 3 (e) 4 < 3 < 2 < 1
8. Which of the following is dehydrohalogenated readily at the highest rate?
Br (a) (b)
(c)
(e)
-Br
Br
Br
(d)
Br
9. Which one of the following statements about the nitrogroup in organic compounds is not correct?
189 CHEMISTRY TODAY | DECEMBER '05 47
(a) the N atom is sp2 hybridised
(b) the N atom forms a N = O bond and a N —> O bond
(c) the two nitrogen-oxygen bond lengths are different (d) it exists in two canonical forms
(e) the nitrogen atom carries a formal charge of +1.
10. Which one of the following molecules is achiral?
(a) l-bromo-2-butene (b) 3-bromo-l-butene (c) 2,3-dihydroxy propanal
(d) 2-hydroxypropanoic acid (e) 2-chlorobutane.
11. The simplest acyclic alkane containing a chiral atom has a vapour density of
(a) 50 (b) 45 (c) 90 (d) 100 (e) 75.
12. Given below are conformations of butane. Which conformation is the most stable?
(a) staggered : anti (b) methyl-hydrogen eclipse (c) hydrogen-hydrogen eclipse
(d) staggered : Gauche (e) methyl-methyl eclipsed.
13. The raw materials for the commercial manufacture of DDT are
(a) chlorobenzene and chloroform (b) chlorobenzene and chloromethane (c) chlorobenzene and chloral (d) chlorobenzene and iodoform (e) chlorobenzene and BHC.
14. Iodoform cannot be prepared by reacting which of the following with NaOH and iodine?
(a) CHjOH (b) CH3CH2OH (c) CH3CHO (d) (CH3)2CO (e) (CH3)2CHOH.
15. Identify C in the following scheme.
CH3CH2CH2OH P C'? > A ALC- KQH > B
(i) conc. H2SQ4 ^ (ii) H20, heat
(a) propyne (b) propene (c) propanol (d) propanone (e) propanal.
16. The reaction of o-chloroaniline with a mixture of HCl and NaN02 followed by cuprous bromide will give
17. Choose the correct acidity order of the following phenols.
(a) />nitrophenol > p-chlorophenol > p-cresol > phenol (b) p-nitrophenol >p-cresol >p-chlorophenol > phenol (c) p-nitrophenol >p-chlorophenol > phenol > /?-cresol (d) p-nitrophenol > phenol >77-chlorophenol > /?-cresol (e) p-nitrophenol >p-cresol > phenol >p-chlorophenol.
18. If diazotisation of aniline is carried out at 30°C, the main organic product formed is
(a) phenol (b) phenyl isocyanide (c) diphenyl amine (d) phenyl hydrazine (e) nitrosobenzene.
19. Give the monomers of nylon-66.
(a) butadiene and acrylonitrile
(b) ethylene glycol and terephthalic acid (c) hexamethylene diamine and adipic acid (d) melamine and formaldehyde
(e) phenol and formaldehyde.
20. CH3CHO + HCHO <"1. NaOH ^ J I C N ^
3 heat H , 0
The structure of compound B is (a) C H , = C H - C H - C O O H
OH (b) CH, = CH - CH - OH
CN I (c) CH3CH2-CH-COOH
OH CN
(d) C H , - C H - C O O H (e) C H3- C - C O O H I
OH OH
21. In DNA molecule, ^ + ^ ratio is 0.9. If the number G + C
of moles of cytosine in the molecule of DNA is 300,000.
The number of moles of thymine in the molecule is (a) 240,000 .(b) 150,000
(c) 120,000 (d) 330,000 (e) 270,000
CHEMISTRY TODAY | DECEMBER '05 47 47
22. Nitration of aniline is achieved by
(a) direct treatment with nitration mixture under reflux (b) using fuming H N 03
(c) acetylation followed by nitration and subsequent hydrolysis
(d) KN03 + conc. HNOj (e) using dilute HN03 in ice.
23. The vulcanized rubber has
(a) high water absorption, resistant to oxidation and good elasticity
(b) high water absorption, susceptible to oxidation and no elasticity
(c) high water absorption, susceptible to oxidation and good elasticity
(d) low water absorption, resistance to oxidation and good elasticity
(e) low water absorption, susceptible to oxidation and no elasticity.
24. Match list I with list II and select the correct answer using the code given below the lists.
List I List II
(chemotherapeutic (Examples) agents)
1. Antibiotic A. Chloroxylenol 2. Antiseptic B. Chlorampheniramine 3. Analgesic C. Chloramphenicol 4. Tranquilliser D. Diclophenac sodium
E. Veronal.
Codes:
(a) 1-A, 2-C, 3-D, 4-E (b) 1-B, 2-A, 3-D, 4-E (c) 1-B, 2-C, 3-E, 4-D (d) 1-C, 2-A, 3-D, 4-E (e) 1-D, 2-B, 3-C, 4-A.
25. Which of the following is/are true?
(i) sucrose is a non reducing agent (ii) glucose is oxidised by bromine water
(iii) glucose rotates plane polarized light in clockwise direction
(iv) fructose is oxidised by bromine water.
Select the correct answer using the coded given below, (a) (i), (ii), (iii) (b) (i), (ii) only
(c) (ii), (iii) only (d) (i), (iv) only (e) all (i), (ii), (iii) and (iv).
26. Which of the following statements about carbon fibres are correct?
1. They can be made from viscose rayon.
2. They are used for making nose tips of missiles.
3. They have low thermal conductivity and used as insulators.
4. They are used for making components of bone plates.
Select the correct answer using the codes given below, (a) 1 and 2 (b) 2 and 3
(c) 2 and 4 (d) 1, 2 and 3 (e) 1 , 2 and 4.
27. Match the lists I and II and pick the correct matching from the codes given below.
List I List II
A. Peroxy acetyl nitrate 1. Waste incineration B. Polycyclic aromatic 2. Global warming
hydrocarbons
C. Dioxins 3. Photochemical smog D. Indigo 4. Carcinogens E. IR active molecules 5. Vat dye.
(a) A-3, B-4, C-l, D-5, E-2 (b) A-l, B-2, C-3, D-4, E-5 (c) A-3, B-5, C-l, D-2, E-4 (d) A-5, B-3, C-l, D-2, E-4 (e) A-2, B-3, C-5, D-4, E-l.
28. For the formation of 3.65 g of hydrogen chloride gas, what volumes of hydrogen gas and chlorine gas are required at N.T.P. conditions?
(a) 1.12 lit., 1.12 lit. (b) 1.12 lit., 2.24 lit.
(c) 3.65 lit., 1.83 lit. (d) 1 lit., 1 lit.
(e) 3.55 lit. and 1.83 lit.
29. An alkaloid contains 17.28% of nitrogen and its molecular mass is 162. The number of nitrogen atoms present in one molecule of alkaloid is
(a) five (b) four (c) three (d) two (e) one.
30. Which of the following sets of quantum numbers violates the rules of quantum mechanics?
(a) n = 3, / = 2, m, - - 3 , ms = +1/2 (b) n = 3, / = 1, TM; = - 1 , ms = -1/2 (c) n = 4, / = 0, mi = 0, ms = +1/2 (d) n = 3, 1 = 2, m, = - 2 , ms = +1/2 (e) n = 5, I = 3, m, = 0, ms = -1/2
31. In which of the following molecules the central atom does not follow the octet rule?
(a) S02 (b) BF3 (C) H20 (d) H2S (e) PC13.
32. Which one of the following statements is true?
191
(a) the dipole moment of NF3 is zero
(b) the dipole moment of NF3 is less than NH3
(c) the dipole moment of NF3 is more than NH3
(d) the dipole moment of NF3 is equal to NH3
(e) the dipole moment of NH3 is zero.
33. The correct order of the lattice energies of the following ionic compounds is
(a) NaCl > MgBr2 > CaO > A1203
(b) NaCl > CaO > MgBr2 > A1203
(c) A1203 > MgBr2 > CaO > NaCl (d) MgBr2 > A1203 > CaO > NaCl (e) A1203 > CaO > MgBr2 > NaCl.
34. A metal crystallises in a bcc lattice. Its unit cell edge length is about 300 pm and its molar mass about 50 g mol"'. What would be the density of the metal (in gem-3)?
(a) 3.1 (b) 6.2 (c) 9.3 (d) 12.4 (e) 15.5
35. A crystalline solid has a cubic structure in which tungsten (W) atoms are located at the cubic corners of the unit cell, oxygen atoms at the cube edges and sodium atom at the cube center. The molecular formula of the compound is
(a) Na2W03 (b) NaW04
(c) NaW03 (d) Na2W04
(e) NaW02.
36. The rate of diffusion of methane is twice that of x. The molecular mass of x is
(a) 16 (b) 32 (c) 80 (d) 64 (e) 128
37. Match list I with list II and select the correct answers using the codes given below.
List I (successive List II
ionisation energies) (elements) JEt IE2 IEI (kJ mol-')
1. 2080 3963 6130 A. H
2. 520 7297 11810 B . L i 3. 9000 1758 14810 C. Be
4. 800 2428 3660 D. B E. Ne C o d e s :
(a) 1-C, 2-B, 3-D, 4-E (b) 1-C, 2-E, 3-B, 4-D (c) 1-D, 2-A, 3-B, 4-D (d) 1-E, 2-B, 3-C, 4-D (e) 1-E, 2-B, 3-D, 4-C.
38. Which of the following properties of interstitial hydrides is incorrect?
(a) they generally form non-stoichiometric species (b) the hydrogen dissolved in titanium improves its
mechanical properties
(c) they give rise to powdered metals fit for fabrication (d) on thermal decomposition, they afford a source
of pure hydrogen
(e) they can be used as hydrogenation catalysts.
39. The bond angle in water is (a) 120° (b) 109.5° (c) 107°
(e) 90°.
(d) 104.5°
40. A substance A on heating gives a colourless gas.
The residue is dissolved in water to form B. When excess C02 is bubbled through solution of B, C is formed.
C on gentle heating re-forms A. The substance A is (a) calcium carbonate (b) sodium carbonate (c) potassium carbonate (d) calcium nitrate (e) sodium bicarbonate.
41. Which of the following statements about alkaline earth metals are correct?
(i) Hydration energy of Sr2+ is greater than that of Be2+
(ii) CaC03 decomposes at a higher temperature than BaC03
(iii) Ba(OH)2 is a stronger base than Mg(OH)2
(iv) SrS04 is less soluble in water than CaS04
Select the correct answer using the code given below, (a) (iv) only (b) (i) and (iii)
(c) (i) and (iv) (d) (ii) and (iii) (e) (iii) and (iv).
42. Match the lists I and II and pick the correct matching from the codes given below.
List I List II
(metal) (ore) A. Aluminium 1. Bauxite
B. Copper 2. Dolomite C. Potassium 3. Pyrites D. Magnesium 4. Pitchblende E. Radium 5. Sylvine (a) A-l, B-3, C-4, D-5, E-2
(b) A-l, B-3, C-4, D-2, E-5 (c) A-4, B-5, C-2, D-l, E-3 (d) A-4, B-2, C-l, D-5, E-3 (e) A-l, B-3, C-5, D-2, E-4.
43. Which of the following is not correct with regard to the structure of diborane?
(a) four terminal hydrogen atoms and two bridged hydrogen atoms
C H E M I S T R Y T O D A Y | DECEMBER '05 47 47
(b) the terminal hydrogen atoms and the boron atoms lie in a plane
(c) four two-centre bonds and two three-centre bonds (d) the two bridged hydrogen atoms lie above and below
the plane
(e) the sp3 hybrid orbitals of the boron atoms have one electron each.
44. Which one of the following statements about halogens is correct?
(a) F2 has lower bond dissociation energy than Cl2. (b) The electron affinities are in the order F > Cl > Br > I.
(c) HF is the strongest hydrohalic acid.
(d) All halogens show variable oxidation states.
(e) van der Waal's forces are the weakest in iodine.
45. Match the list I and II and pick the correct matching from the codes given below.
List 1 (substance)
A. Helium 1.
B. Argon 2.
List II (application)