VITEEE 2009 Sample Question Papers - Chemistry

41.  The oxidation number of oxygen ¾

        Ans:   KO ₃: + 1 + 3x = 0,              x =

                   Na ₂O₂: + 2 + 2x = 0,          x = - 1

                   Choice (D)

42.  Reaction of I Cl₃ and PhMgBr ¾

        Ans:   Triphenyl phosphene

                   3C ₆H₅MgBr + PCl₃ ® (C₆H₅)₃P + 3MgClBr

                   Choice (C)

43.  ……. not a characteristic of transition elements?

        Ans:   Choice (D)

44.  Cl - P - Cl bond ¾

        Ans:   Arial bonds are 90° and Equatorial bonds are 120°.

                   Choice (A)

45.  --- magnetic moment ¾

        Ans:   No unpaired electron.

                   Choice (A)

46.  The number of Formula units of calcium fluoride CaF₂ ¾

        Ans:   Number of moles =

                   Number of formula units =  ´ 6.023

                                                                                  ´ 10²³

                                                                = 1.129 ´ 10²⁴

                   Choice (A)

47.  The IUPAC name of the given ¾

        Ans:   Choice (C)

48.  When SCN^? is added to an aqueous ¾

        Ans:   Fe ³⁺ + SCN^? + H₂O ® [Fe(H₂O)₅SCN]²⁺

                   Choice(B)

49.  Hair dyes contain

        Ans:   Choice (C)

50.  Schottky defects occurs ¾

        Ans:   Schottky defect occurs when the ions have almost the same size

                   Choice (B)

51.  The number of unpaired electron ¾

        Ans:   [Co(NH ₃)₆]³⁺ - Inner orbital complex

                                          - No unpaired electron

                   [CoF ₆]^3?         - Outer orbital complex

                                          - 4 unpaired electrons

                   Choice (D)

52.  The standard free energy change of a reaction ¾

        Ans:   - D G° = 2.303 RT log K_p

                    log K_p

                   0.02016 ´ 10³ = log K_p

                                             = log K _p = 20.16

                   Choice (A)

53.  If an endothermic reaction occurs spontaneously at ¾

        Ans:   For an endothermic reaction D H is positive, the reaction occurs spontaneously when D S > 0

                   Choice (C)

54.  If a plot of log10 C versus t fives a straight line ¾

        Ans:   t =

                   t ´  = logC₀ - logC

                   logC = logC₀ - t ´

                   logC is t in a stline with slope

                   Choice (B)

55.  A spontaneous process is one in which ¾

        Ans:   For a spontaneous process D G is negative.

                   Choice (B)

56.  The half life period of a first order reaction ¾

        Ans:   t _½ = 100 sec.

                   For a first order reaction t _½ =

                   K =  =  = 6.93 ´ 10^?3 sec^?1

                   Choice (B)

57.  The molar conductivities of KCl, NaCl and KNO₃ are ¾

        Ans:   =

                   = 128 + 111 - 152 = 87 S cm² mol^?1

                   Choice (B)

58.  The electrochemical cell stops working ¾

        Ans:   When both the electrode potentials become equal cell reactions stops.

                   Choice (B)

59.  The amount of electricity required to produce ¾

        Ans:   1 mole of copper is 2 equivalents

                   Current required = 2 Faraday

                   Choice (C)

60.  Dipping iron article into a strongly alkaline ¾

        Ans:   Choice (C)

61.  Hydroboration oxidation of 4-methyl-octene ¾

        Ans:   Hydroboration – oxidation of alkenes give alcohols containing the same number of carbon atoms. Net reaction involves addition of H₂O against Markownikoff’s rule.

                   Choice (A)

62.  When ethyl alcohol is heated

        Ans:   Ethanol undergoes dehydration when heated with conc.H₂SO₄ to form ethylene.

                   Choice (D)

63.  Anisole is the product obtained from ¾

        Ans:   Anisole is phenyl methyl ether.

                   Choice (B)

64.  Ethylene glycol gives oxalic acid ¾

        Ans:   Choice (C)

65.  Diamond is hard ¾

        Ans:   Choice (A)

66.  A Wittig reaction with an aldehyde ¾

        Ans:   Carbonyl compounds react with phosphorous yields to form alkenes. This is known as Witting reaction.

                   Choice (C)

67.  Cannizzaro reaction is ¾

        Ans:   HCHO does not contain a -hydrogen atom. So it undergoes Cannizzaro reaction.

                   Choice (A)

68.  ¾

        Ans:   C ₆H₆ + CO  C₆H₅ - CHO

        This is known as Gattermann-Koch aldehyde synthesis.

                   Choice (C)

69.  Maleic acid and Fumaric acids ¾

        Ans:   Maleic acid is the cis-isomer and fumaric acid is the trans-isomer.

                   Choice (B)

70.  The gas evolved on heating ¾

        Ans:   HCOONa + NaOH

                                                        H ₂ + Na₂CO₃.

                   Choice (C)

71.  CH ₃CH₃ + HNO₃ ¾

        Ans:   Choice (B)

72.  When acetamide is hydrolysed by ¾

        Ans:   Choice (A)

73.  Which will not go for diazotization?

        Ans:   Choice (B)

74.  Secondary nitroalkanes can be ¾

        Ans:  

                   Choice(A)

75.  ………. Stephen reduction to ¾

        Ans:   Alkyl cyanides on reduction with SnCl₂ and HCl will give aldehyde.

                   Choice (A)

76.  The continuous phase contains ¾

        Ans:   Choice (C)

77.  The number of hydrogen atoms present in ¾

        Ans:   = 9.91 ´ 10²³

                   Choice (B)

78.  Milk changes after digestion ¾

        Ans:   Choice (C)

79.  ……… essential amino acids?

        Ans:   Choice (B)

80.  ….. is a Ketohexose?

        Ans:   Choice (C)