Kerala University 2005 B.E Engineering Entrance - Question Paper

through pure water. The loss in weight of solution is 2.5g and that of pure solvent is 0.05g.
compute the molecular weight of the solute?
A. 50
B. 180
C. 102
D. 25
E. 51
Ans: C
28. The van’t Hoff factor for BaCl2 at 0.01M concentration is 1.98. The percentage of
dissociation of BaCl2 at this concentration is
A. 49
B. 69
C. 89
D. 98
E. 100
Ans: A
29. The standard electrode potentials of Ag+/ Ag is +0.80 V and Cu+/Cu is +0.34 V. These
electrodes are connected through a salt bridge and if
A. Copper electrode acts as a cathode then Eo cell is +0.46 V
B. Silver electrode acts as anode then Eo cell is –0.34 V
C. Copper electrode acts as anode the Eo cell is +0.46 V
D. Silver electrode acts as a cathode then Eo cell is –0.34 V
E. Silver electrode acts as anode then Eo cell is +1.14 V
Ans: C
30. In alkaline medium ClO2 oxidises H2O2 to O2 and itself gets decreased to Cl-. How many moles
of H2O2 are oxidized by one mole of ClO2?
A. 1.0
B. 1.5
C. 2.5
D. 3.5
E. 5.0
Ans: C
31. For the reaction 2N O (g) 4NO (g) O (g) two five two 2 ? + if the concentration of NO2 increases by
5.2 ×10-3M in 100 seconds then the rate of the reaction is
A. 1.3×10-5Ms-1
B. 5×10-4Ms-1
C. 7.6 ×10-4Ms-1
D. 2×10-3Ms-1
E. 2.5×10-5Ms-1
Ans: A
32. A 1st order reaction is 10% complete in 20 min. The time taken for 19% completion is
A. 30 min.
B. 40 min.
C. 50 min.
D. 38 min.
E. 45 min.
Ans: B
33. Lyophilic sols are more stable than lyophobic sols because the particles
A. Are positively charged
B. Are negatively charged
C. Are solvated
D. Repel every other
E. Are heavy
Ans: C
34. Potassium stearate is found by the saponification of an oil or fat. It has the formula
CH -(CH ) - COO-K+ three two 16 . The molecule has a lyophobic end three CH and a lyophilic end
COO-K+ . Potassium stearate is an example for
A. Lyophobic colloid
B. Lyophilic colloid
C. Multimolecular colloid
D. Macromolecular colloid
E. Associated colloid or micelle
Ans: E
35. (a) [ ( )]4 six K Fe CN (b) [ ( )]3 six K Cr CN (c) [ ( ) ] three six K Co CN (d) [ ( ) ] two four K Ni CN . choose the
complexes which are diamagnetic.
A. (a), (b) and (c)
B. (b), (c) and (d)
C. (a), (c) and (d)
D. (a), (b) and (d)
E. (b) and (d)
Ans: C
36. Which is not actual of the coordination compound [Co(en) Cl ]Cl two 2 ?
A. Exhibits geometrical isomerism
B. Exhibits optical isomerism
C. Exhibits ionization isomerism
D. Is an octahedral complex
E. Is a cationic complex
Ans: C
37. The IUPAC name of the provided compound is
COOH
HOOC CH CH CH CH COOH two 2 two - - - - -
A. two (carboxylmethyl)-pentane-1, 5-dioic acid
B. 3-carboxyhexane-1, 6-dioic acid
C. Butane-1, 2, 4-tricarboxylic acid
D. 4-carboxyhexane-1, 6-dioic acid
E. 1, 2-dicarboxy-pentanoic acid
Ans: C
38. How much of sulphur is current in an organic compound, if the 0.53 g of the compound gave
1.158 g of BaSO4 on analysis?
A. 10%
B. 15%
C. 20%
D. 25%
E. 30%
Ans: E
39. An alkene having the molecular formula C9H18 on ozonolysis provide 2,2-dimethyl propanal
and 2-butanone. The alkene is
A. 2, 2, 4-trimethyl-3-hexene
B. 2, 2, 6-trimethyl-3-hexane
C. 2, 3, 4-trimethyl-2-hexene
D. 2, 2, 4-trimethyl-2-hexene
E. 2, 2-dimethyl-3-heptene
Ans: A
40. Observe the subsequent reactions and predict the nature of A and B
A. A and B both are
B. A and B both are
C. A is and B is
D. A is and B is
E. A is and B is
Ans: C
41. Nitration of aniline in strongly acidic medium, outcome in the formation of m-nitroaniline also.
This is because
A. Amino group is meta orienting during electrophilic substitution reaction
B. Nitro group goes always to the meta position irrespective of the substituents
C. Nitration of aniline is a nucleophilic substitution reaction in strongly acidic medium
D. In strongly acidic conditions aniline is current as anilinium ion
E. Strong acids generate nitrite anion which can attack only the meta position
Ans: D
42. How many sigma and pi bonds are current in toluene?
A. 3p + 8s
B. 3p + 6s
C. 3p +15s
D. 6p + 3s
E. 6p + 6s
Ans: C
43. Which of the subsequent Fischer’s projection formula is identical to D-glyceraldehyde?
A. B.
C. D.
E.
Ans: C
44. The name of the compound is
A. (2Z, 4Z) – 2,4-hexadiene
B. (2Z, 4E) – 2, 4-hexadiene
C. (2E, 4Z) – 2,4-hexadiene
D. (4E, 4Z) –2,4-hexadiene
E. (2E, 4E) –2,4-hexadiene
Ans: E
45. When 32.25 g of ethylchloride is subjected to dehydrohalogenation reaction the yield of the
alkene formed is 50%. The mass of the product formed is (atomic mass of chlorine is 35.5)
A. 14 g
B. 28 g
C. 64.5 g
D. 56 g
E. seven g
Ans: E
46. Chlorination of toluene in presence of light and heat followed by treatment with aqueous
NaOH provide
A. o-cresol
B. p-cresol
C. Mixture of o-cresol and p-cresol
D. Benzoic acid
E. 1, 3, five - trihydroxy toluene
Ans: D
47. CH CHO HCN A three - + ? . Compound A on hydrolysis provide
A. CH CH COOH three two - -
B. three two 2 two CH - CH - CH - NH
C. CH CO COOH three - -
D. CH CO CH NOH three - - =
E.
OH
CH CH COOH three - -
Ans: E
48. Which of the subsequent does not undergo Cannizzaro’s reaction?
A. Benzaldehyde
B. 2-methylpropanal
C. p-methoxybenzaldehyde
D. 2, 2-dimethylpropanal
E. Formaldehyde
Ans: B

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