NEET (UG) – 2016 Chemistry Previous Year Paper

46. Consider the molecules CH₄,NH₃ and H₂O. Which of the given statements is false?

(1)The H – C – H bond angle in CH₄, the H – N – H bond angle in NH₃, and the H – O – H bond angle inH₂O are all greater than 90°.

(2)The H – O – H bond angle in H₂O is larger than the H – C – H bond angle in CH₄.

(3)The H – O – H bond angle in H₂O is smaller than the H – N – H bond angle in NH₃.

(4)The H – C – H bond angle in CH₄ is larger than the H – N – H bond angle in NH₃.

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47.

(1) X = 1 – Butyne ; Y = 3 – Hexyne

(2) X = 2 – Butyne ; Y = 3 – Hexyne

(3) X = 2 – Butyne ; Y = 2 – Hexyne

(4) X = 1 – Butyne ; Y = 2 – Hexyne

48. Among the following, the correct order of acidity is:

(1) HClO₃ < HClO₄< HClO₂ < HClO

(2) HClO < HClO₂ < HClO₃< HClO₄

(3) HClO₂ < HClO < HClO₃ < HClO₄

(4) HClO₄ < HClO₂ < HClO < HClO₃

49. The rate of a first-order reaction is 0.04 mol l⁻¹s⁻¹ at 10 second and 0.03 mol l⁻¹s⁻¹ at 20 seconds afterinitiation of the reaction. The half-life period of the reaction is:

(1)24.1 s (2)34.1 s

(3)44.1 s (4)54.1 s

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50. Which one of the following characteristics is associated with adsorption?

(1)ΔG is negative but ΔH and ΔS are positive

(2)ΔG,ΔH and ΔS all are negative

(3)ΔG and ΔH are negative but ΔS is positive

(4)ΔG and ΔS are negative but ΔH is positive

51. In which of the following options the order of arrangement does not agree with the variation of propertyindicated against it?

(1)Al³⁺ < Mg²⁺ < Na⁺ < F⁻ (increasing ionic size)

(2)B < C < N < O (increasing first ionization enthalpy)

(3)I < Br < Cl < F (increasing electron gain enthalpy)

(4)Li < Na < K < Rb (increasing metallic radius)

52. Which of the following statements is false?

(1)Mg²⁺ ions form a complex with ATP.

(2)Ca²⁺ ions are important in blood clotting.

(3)Ca²⁺ ions are not important in maintaining the regular beating of the heart.

(4)Mg²⁺ ions are important in the green parts of plants.

53. Which of the following statements about hydrogen is incorrect?

(1) Hydrogen has three isotopes of which tritium is the most common.

(2) Hydrogen never acts as cation in ionic salts.

(3) Hydronium ion, H₃O⁺ exists freely in solution.

(4) Dihydrogen does not act as a reducing agent.

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54. The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha carbon, is:

(1) A carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its correspondingenol.

(2) A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its correspondingenol and this process is known as aldehyde-ketone equilibration.

(3) A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its correspondingenol and this process is known as carbonylation.

(4) A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its correspondingenol and this process is known as keto-enol tautomerism.

55. MY and NY₃, two nearly insoluble salts, have the same K_sp values of 6.2×10⁻¹³ at room temperature. Whichstatement would be true in regard to MY and NY₃?

(1) The molar solubilities of MY and NY₃ in water are identical.

(2) The molar solubility of MY in water is less than that of NY₃.

(3) The salts MY and NY₃ are more soluble in 0.5 M KY than in pure water.

(4) The addition of the salt of KY to solution of MY and NY₃ will have no effect on their solubilities.

57. Nutural rubber has:

(1) All cis – configuration

(2) All trans – configuration

(3) Alternate cis – and trans – configuration

(4) Random cis – and trans – configuration

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58.

(1) (a) – (iv) (b)- (ii) (c) – (iii) (d) – (i)

(2) (a) – (ii) (b)- (iii) (c) – (i) (d) – (v)

(3) (a) – (i) (b)- (ii) (c) – (iii) (d) – (iv)

(4) (a) – (iii) (b)- (iv) (c) – (v) (d) – (i)

59. Which one of the following statements is correct when SO₂ is passed through acidified K₂Cr₂O₇ solution?

(1) The solution turns blue.

(2) The solution is decolourized.

(3) SO₂ is reduced.

(4) Green Cr₂(SO₄)₃ is formed.

60. The electronic configurations of Eu (Atomic no. 63), Gd (Atomic NO. 64) and Tb (Atomic No. 65) are:

(1) [Xe]4f⁷6s² ,[Xe]4f⁸6s² and [Xe]4f⁸5d¹6s²

(2) [Xe]4f⁶5d¹6s² ,[Xe]4f⁷5d¹6s² and [Xe]4f⁹6s²

(3) [Xe]4f⁶5d¹6s² ,[Xe]4f⁷5d¹6s² and [Xe]4f⁸5d¹6s²

(4) [Xe]4f⁷6s² ,[Xe]4f75d¹6s² and [Xe]4f⁹6s²

61. Two electrons occupying the same orbital are distinguished by:

(1) Principal quantum number

(2) Magnetic quantum number

(3) Azimuthal quantum number

(4) Spin quantum number

62. When copper is heated with conc. HNO3 it produces:

(1) Cu(NO₃)₂ and NO₂

(2) Cu(NO₃)₂ and NO

(3) Cu(NO₃)₂,NO and NO₂

(4) Cu(NO₃)2 and N₂O

63. Which of the following reagents would distinguish cis-cyclopenta-1, 2-diol from the trans-isomer?

(1) Acetone (2) Ozone

(3) MnO₂ (4) Aluminium isopropoxide

64. The correct thermodynamic conditions for the spontaneous reaction at all temperatures is:

(1) ΔH < 0 and ΔS = 0

(2) ΔH > 0 and ΔS < 0

(3) ΔH < 0 and ΔS > 0

(4) ΔH < 0 and ΔS < 0

65. Lithium has a bcc structure. Its density is 530 kg m⁻³ and its atomic mass is 6.94 g mol⁻¹. Calculated the edgelength of a unit cell of Lithium metal. (NA=6.02×10²³ mol⁻¹)

(1) 154 pm (2) 352 pm

(3) 527 pm (4) 264 pm

66. Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

(1) I₂ > Br₂ > Cl₂ > F₂

(2) Cl₂ > Br₂ > F₂ > I₂

(3) Br₂ > I₂ > F₂ > Cl₂

(4) F₂ > Cl₂ > Br₂ > I₂

67. Which of the following is an analgesic?

(1) Novalgin

(2) Penicillin

(3) Streptomycin

(4) Chloromycetin

68. Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both canescape. What fraction of the oxygen escape in the time required for one-half of the hydrogen to escape?

(1) 1 / 8

(2) 1 / 4

(3) 3 / 8

(4) 1 / 2

69. Consider the nitration of benzene using mixed conc. H₂SO₄ and HNO₃. If a large amount of KHSO₄ is added tothe mixture, the rate of nitration will be:

(1) Faster

(2) Slower

(3) Unchanged

(4) Doubled

70. Predict the correct order among the following:

(1) Lone pair – lone pair > lone pair – bond pair > bond pair – bond pair

(2) Lone pair – lone pair > bond pair – bond pair > lone pair – bond pair

(3) Bond pair – bond pair > lone pair – bond pair > lone pair – lone pair

(4) Lone pair – bond pair > bond pair – bond pair > lone pair – lone pair