NEET - 2 MODEL GRAND TEST - 2016 No. of Questions: 180

Marks: 720

(-E-†o-öÀ -ûª®Ω’-¢√®·) 42. The temperature at which the speed of sound in air becomes double of its value at 27°C is a) 327°C b) 127°C c) 927°C d) −123°C 43. The deviation produced by a prism of angle ⎯ 4° and refractive index of material √ 2 is a) 2.210° b) 0.627° c) 1.414° d) 1.656° 44. A string is hanging from rigid support. A transverse wave pulse is setup at the free end. The velocity of the pulse related to distance covered by it is ⎯ a) v ∝ √ x b) v ∝ x 1 1 c) v ∝ ⎯ d) v ∝ ⎯ x x2 45. Two light waves having displacement y1 = 18 sin (ωt − kx) and y2 = 9 sin (ωt − kx + φ) interfere. The ratio of maximum to the minimum intensity of light in the interference pattern is a) 9 : 1 b) 3 : 1 c) 2 : 1 d) 81 : 1

PART - B: CHEMISTRY 46. In the following figure the Cr ⎯ O ⎯ Cr bond angle is of X°. What is the exact value of X°?

a) 126°

b) 136°

c) 116°

d) 106°

47. Which of the following element has the +ve electron gain enthalpy? a) N b) Mg c) He d) All of these 48. The relative lowering of the vapour pressure of an aqueous solution containing a nonvolatile solute is 0.0125. The molality of the solution is a) 0.70 b) 0.50 c) 0.80 d) 0.40 49. Which of the following is incorrect regarding H-bonding? a) Intramolecular H-bonding gives more stability than intermolecular H-bond. b) In the absence of H-bonding boiling point of water should be very slow. c) Strongest H-bond is found in KHCl2 d) H-bond of NH3 can exist in liquid state. 50. Which of the following properties are same for hcp and ccp lattice? a) Number of atoms per unit cell b) Coordination number c) Packing fraction d) both (b) and (c) 51. Which of the following is correct regarding quantum mechanical model of atom? a) Schrodinger equation can be written only for those system, whose energy does not change with time. b) Out of four quantum numbers only three are derived from Schrodinger equation. c) It is based on Heisenberg uncertainty principle and wave nature of electron. d) All of these 52. Nickel crystallizes in a fcc unit cell with a cell edge length of 0.3524 nm. The radius of the nickel atoms a) 0.1824 nm b) 0.1246 nm c) 0.2164 nm d) 0.426 nm 53. The reaction of anisole with HI gives phenol rather than iodobenzene because a) the bond between O − CH3 is weaker than O − C6H5 b) the carbon of phenyl group is sp2 hybridised and has a partial double bond character c) Both (a) and (b) d) None of the above

54. Peptization involves a) Precipitation of colloidal particles b) Disintegration of precipitate particles c) Evaporation of dispersion medium d) Impact of molecules of the dispersion medium on the colloidal particles. 55. Equilibrium constant of a reversible reaction a) Tells about the maximum yield of product b) Tells about the time taken to complete the reaction c) Tells about the relative thermodynamic stability of product and reactant d) both a and c 56. The maximum power of coagulating Arsenious sol is, shown by a) Na2SO4 b) Na3PO4 c) AlCl3 d) Mg(NO3)2 57. Solubility of an electrolyte does not depend on i) Temperature ii) Nature of electrolyte iii) Nature of solvent iv) Presence of common ion a) (ii) & (iii) b) (iv) only c) (ii), (iii) & (iv) d) It depends on all these factors 58. The rate law for the reaction 2 H2(g) + 2 NO(g) ⎯→ N2(g) + 2H2O(g) is rate = K[H2][NO]2 If volume of reactant becomes double by adding water then rate changes by a factor of 1 1 a) ⎯ b) 8 c) 4 d) ⎯ 8 4 59. If at equilibrium HI dissociates 50% then equilibrium constant of the reaction H2 + I2 2HI will be 1 1 a) ⎯ b) 4 c) ⎯ d) 2 4 2 60. In an exothermic reaction X ⎯→ Y, the activation energy is 100 kJ mol−1 of X. The enthalpy of the reaction is −140 kJ mol−1. The activation energy of the reverse reaction Y ⎯→ Z is a) 40 kJ mol−1 b) 340 kJ mol−1 −1 c) 240 kJ mol d) 100 kJ mol−1 − 61. In the ring test for NO3 ion, a brown ring is formed due to the formation of a) FeSO4 . NO2 b) FeSO4 .HNO3 c) [Fe(H2O)5(NO)]2+ d) [Fe(H2O)4 (NO)2]2+ 62. On heating, which of the following nitrates gives O2 under normal condition? a) NH4NO3 b) NH4NO2 c) NaNO3 d) All of these 63. Which of the following reaction is not possible according to electrode potential? ∆ a) 2 Ag2O ⎯→ 4Ag + O2 ∆ b) 2 Ag + Cu+2 ⎯→ 2Ag+ + Cu ∆ c) Cu + 2 H2SO4 ⎯→

Time: 3 Hrs.

bond is x, y and z cal mol−1 respectively then N2 + 3H2 ⎯⎯→ 2NH3 a) ∆Hr = 6z − (x + 3y) x + 3y b) ∆Hf(NH3) = ⎯⎯ − 3z 2 c) ∆Hf(NH3) = 6z + (x + 3y) d) Both (a) and (b) 68. On the basis of information given below mark the correct option.

(

Information: A) In bromoethane and chloroethane mixture intermolecular interactions of A − A and B − B type are nearly same as A − B type interactions. B) In ethanol and acetone mixture A − A or B − B type intermolecular interactions are stronger than A − B type interactions. C) In chloroform and acetone mixture A − A or B − B type intermolecular interactions are weaker than A − B type interactions. a) Solution (B) and (C) will follow Raoult's law. b) Solution (A) will follow Raoult's law. c) Solution (B) will show negative deviation from Raoult's law. d) Solution (C) will show positive deviation from Raoult's law. 69. Which of the following should be most volatile? I. CH3CH2CH2NH2 II. (CH3)3N CH3CH2

III.

NH

IV. CH3CH2CH3

CH3 Choose the correct option. a) II b) IV c) I d) III 70. Which of the following is expected to be colourless? a) [Ti(H2O)6]3+ b) [Ti(NO3)4] c) [Cr(NH3)6]3+ d) [Fe(CN)6]3− 71. Correct sequence of ionization enthalpy of group 13 element is a) B > Tl > Ga > Al > In b) B > Ga > Al > In > Tl c) B > Ga > Al > Tl > In d) B > In > Gn > Al >Tl 72. Which of the following pairs of structures represents facial and meridional isomers respectively? Cl

Cl

NH3

NH3

Cl

a)

Co NH3

and Cl

NH3

NH3

NH3

c)

and NH3

Cl

NH3

Cl

NH3

d)

c)

77. In comparison to a 0.01 M solution of glucose, the depression in freezing point of a 0.01 M MgCl2 solution is ................ a) the same b) about twice c) about three times d) about six times 78. According to Arrhenius equation, rate constant k is equal to A−Ea/RT. Which of the following options represents the graph of 1 ln k vs ⎯ ? T

a)

b)

c)

d)

79. Methyl carbanion is isostructural with a) BCl3 b) CHCl3 c) NH3 d) All of these 80. Thermoplastic polymers are those a) That becomes soft on heating b) That possess intermolecular forces stronger than elastomeres. c) That possess intermolecular forces weaker than fibres d) All of these 81. Which of the following is not correctly matched?

(+E Effect)

Cl

NH3

Cl

Cl

NH3 Co

(σ−p conjugation) NH3

(n − p Conjugation)

NH3 Cl Co

and Cl

Cl Co

Cl NH3

NH3

Cl

NH3

and

Cl

Cl

I

Cl

Cl NH3

Co

d)

b)

a)

Cl

Co

Cl

NH3

F

Br

Cl

Co NH3

Cl

NH3

Cl

b)

Cl Co

Cl NH3

(conc.)

SO2 + CuSO4 + 2 H2O ∆ d) Na2O ⎯→ No reaction 64. In thiosulphuric acid (H2S2O3), the two sulphur atoms have the oxidation states a) +2 and − 2 b) +4 and −2 c) +6 and −2 d) +4 and +2 65. Which is correct? a) For H2, He, Z > 1 b) aH2 < aCl2 c) TC(NH3) > TC(H2) (where TC = Critical temperature) d) All of these 66. Fluorine reacts with water to produce a) HF and H2O2 b) HF, O2 and F2O2 c) F−, O2 and H+ d) F2O and F2O2 67. If bond energy of N ≡ N, H − H, and N − H

)

75. Which is incorrect regarding C60? a) All the Cl are in sp2 state b) They are aromatic c) There are 12 five membered and 20 six membered ring d) It has 60 vertices 76. Most reactive aryl halide towards nucleophilic substitution reaction

NH3

Cl

NH3

73. Which of the following forms sesquioxides mainly? a) Group 1 b) Group 2 c) Group 13 d) Group 14 74. Catalytic activity of transition metal is due to a) High malleability b) High ductility c) Variable oxidation state d) High charge/mass

(+R effect)

82. The number of HIO4 molecules required to react with one molecule of glucose is a) 5 b) 6 c) 4 d) 3 83. Kjeldahl method cannot be used for a) Pyridine b) Nitro-group c) Azo-group d) All of these ⎯→

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