## JEE Main Session 2 29th January 2023 Shift 2 Question Paper and Answer Key

JEE MAIN 29th January 2023 Shift 2

Physics

SECTION-A

IMPORTANT INSTRUCTIONS:

(1) The test is of 3 hours duration:

(2) The Test Booklet consists of 90 questions. The maximum marks are 300.

(3) There are three parts in the question paper consisting of Physics, Chemistry and Mathematics having 30 questions in each part of equal weightage. Each part (subject) has two sections.

(i) Section-A: This section contains 20 multiple choice questions which have only one correct answer. each question carries 4 marks for correct answer and 1 mark for wrong answer.

(ii) Section-B: This section contains 10 questions. In Section-B, attempt any five questions out of 10. The answer to each of the questions is a numerical value. Each question carries 4 marks for correct answer and 1 mark for wrong answer. For Section-B, the answer should be rounded off to the nearest integer.

1. Substance A has atomic mass number 16 and half-life of 1 day. Another substance 𝐵 has atomic mass number 32 and half life of 1/2 day. If both 𝐴 and 𝐵 simultaneously start undergo radio activity at the same time with initial mass 320 g each, how many total atoms of A and B combined would be left after 2 days

(1)   3.38 × 1024

(2)   1.69 × 1024

(3)   6.76 × 1024

(4)   6.76 × 1023

Answer: (1)

2. For the given logic gates combination, the correct truth table will be

Answer: (3)

3. The time taken by an object to slide down 45° rough inclined plane is n times as it takes to slide down a perfectly smooth 45∘ incline plane. The coefficient of kinetic friction between the object and the incline plane is:

Answer: (3)

4. Heat energy of 184 kJ is given to ice of mass 600 g at −12∘ Specific heat of ice is 2222.3 J kg−1C−1 and latent heat of ice in 336 kJkg−1

(A) Final temperature of system will be 0∘C.

(B) Final temperature of the system will be greater than 0∘C.

(C) The final system will have a mixture of ice and water in the ratio of 5:1.

(D) The final system will have a mixture of ice and water in the ratio of 1:5.  E. The final system will have water only.

Choose the correct answer from the options given below:

(1)   A and D only

(2)   A and E only

(3)   A and C only

(4)   B and D only

Answer: (1)

5. Identify the correct statements from the following:

(A) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket is negative.

(B) Work done by gravitational force in lifting a bucket out of a well by a rope tied to the bucket is negative.

(C) Work done by friction on a body sliding down an inclined plane is positive.

(D) Work done by an applied force on a body moving on a rough horizontal plane with uniform velocity in zero.

(E) Work done by the air resistance on an oscillating pendulum in negative.

Choose the correct answer from the options given below:

(1)   B, D and E only

(2)   A and C only

(3)   B and D only

(4)   B and E only

Answer: (4)

6. A scientist is observing a bacteria through a compound microscope. For better analysis and to improve its resolving power he should. (Select the best option)

(1) Increase the refractive index of the medium between the object and objective lens

(2) Decrease the diameter of the objective lens

(3) Increase the wave length of the light

(4) Decrease the focal length of the eye piece.

Answer: (1)

7. With the help of potentiometer, we can determine the value of emf of a given cell. The sensitivity of the potentiometer is

(A) directly proportional to the length of the potentiometer wire

(B) directly proportional to the potential gradient of the wire

(C) inversely proportional to the potential gradient of the wire

(D) inversely proportional to the length of the potentiometer wire

Choose the correct option for the above statements:

(1)   A only

(2)   C only

(3)   A and C only

(4)   B and D only

Answer: (3)

8. A force acts for 20 s on a body of mass 20 kg, starting from rest, after which the force ceases and then body describes 50 m in the next 10 s. The value of force will be:

(1)   40 N

(2)   5 N

(3)   20 N

(4)   10 N

Answer: (2)

9. The modulation index for an A.M. wave having maximum and minimum peak-to-peak voltages of 14 mV and 6 mV respectively is:

(1)   0.4

(2)   0.6

(3)   0.2

(4)   1.4

Answer: (1)

10. Given below are two statements:

Statement I: Electromagnetic waves are not deflected by electric and magnetic field.

Statement II: The amplitude of electric field and the magnetic field in electromagnetic waves are related to each other as

In the light of the above statements, choose the correct answer from the options given below :

(1) Statement I is true but statement II is false

(2) Both Statement I and Statement II are false

(3) Statement I is false but statement II is true

(4) Both Statement I and Statement II are true

Answer: (1)

11. A square loop of area 25 cm2 has a resistance of 10 Ω. The loop is placed in uniform magnetic field of magnitude 40.0 T. The plane of loop is perpendicular to the magnetic field. The work done in pulling the loop out of the magnetic field slowly and uniformly in 1.0sec, will be

(1)   1.0 × 103 J

(2)   2.5 × 103 J

(3)   5 × 103 J

(4)   1.0 × 104 J

Answer: (1)

12. For the given figures, choose the correct options:

(1) At resonance, current in (b) is less than that in (a)

(2) The rms current in circuit (b) can never be larger than that in (a)

(3) The rms current in figure(a) is always equal to that in figure (b)

(4) The rms current in circuit (b) can be larger than that in (a)

Answer: (2)

13. A fully loaded boeing aircraft has a mass of 5.4 × 105 Its total wing area is 500 m2. It is in level flight with a speed of 1080 km/h. If the density of air ρ is 1.2 kg m−3, the fractional increase in the speed of the air on the upper surface of the wing relative to the lower surface in percentage will be. (g = 10 m/s2)

(1)   16

(2)   10

(3)   8

(4)   6

Answer: (2)

14. The ratio of de-Broglie wavelength of an α particle and a proton accelerated from rest by the same potential is 1/√m, the value of m is-

(1)   16

(2)   4

(3)   2

(4)   8

Answer: (4)

15. The time period of a satellite of earth is 24 hours. If the separation between the earth and the satellite is decreased to one fourth of the previous value, then its new time period will become.

(1)   4 hours

(2)   6 hours

(3)   3 hours

(4)   12 hours

Answer: (3)

16. The electric current in a circular coil of four turns produces a magnetic induction 32 T at its centre. The coil is unwound and is rewound into a circular coil of single turn, the magnetic induction at the centre of the coil by the same current will be :

(1)   16 T

(2)   2 T

(3)   8 T

(4)   4 T

Answer: (2)

17. A point charge 2 × 10−2 C is moved from P to S in a uniform electric field of 30NC−1 directed along positive x-axis. If coordinates of P and S are (1, 2, 0)m and (0, 0, 0)m respectively, the work done by electric field will be

(1)   1200 mJ

(2)   −1200 mJ

(3)   −600 mJ

(4)   600 mJ

Answer: (3)

18. An object moves at a constant speed along a circular path in a horizontal plane with center at the origin. When the object is at =+2 m, its velocity is

The object’s velocity (v) and acceleration ( a ) at x = −2 m will be

Answer: (3)

19. At 300 K the rms speed of oxygen molecules is  times to that of its average speed in the gas. Then, the value of α will be (used = 22/7)

(1)   28

(2)   24

(3)   32

(4)   27

Answer: (1)

20. The equation of a circle is given by x2 + y2 = a2, where 𝑎 is the radius. If the equation is modified to change the origin other than (0, 0), then find out the correct dimensions of A and B in a new equation : The dimensions of t is given as [T−1].

(1) A=[LT], B=[L−1 T−1]

(2) A=[L−1 T−1], B=[LT]

(3) A=[L−1 T], B=[LT−1]

(4) A=[L−1 T−1], B=[LT−1]

Answer: (1)

SECTION-B

21. A particle of mass 100 g is projected at time t = 0 with a speed 20 ms−1 at an angle 45∘ to the horizontal as given in the figure. The magnitude of the angular momentum of the particle about the starting point at time t = 2 s is found to be √K kgm2/s. The value of K is ________. (Take g = 10 ms2)

Answer: (800)

22. Unpolarised light is incident on the boundary between two dielectric media, whose dielectric constants are 2.8 (medium −1) and 6.8 (medium −2), respectively. To satisfy the condition, so that the reflected and refracted rays are perpendicular to each other, the angle of incidence should be  the value of θ is ________.

(Given for dielectric media, μr = 1)

Answer: (7)

23. A particle of mass 250 g executes a simple harmonic motion under a periodic force F = (−25x)N. The particle attains a maximum speed of 4 m/s during its oscillation. The amplitude of the motion is ______ cm.

Answer: (40)

24. A car is moving on a circular path of radius 600 m such that the magnitudes of the tangential acceleration and centripetal acceleration are equal. The time taken by the car to complete first quarter of revolution, if it is moving with an initial speed of 54 km/hr is t(1 – e−π/2)S. The value of t is ________.

Answer: (40)

25. When two resistances R1 and R2 connected in series and introduced into the left gap of a meter bridge and a resistance of 10Ω is introduced into the right gap, a null point is found at 60 cm from left side. When R1 and R2 are connected in parallel and introduced into the left gap, a resistance of 3Ω is introduced into the right-gap to get null point at 40 cm from left end. The product of R1R2 is _______ Ω2

Answer: (30)

26. In an experiment of measuring the refractive index of a glass slab using travelling microscope in physics lab, a student measures real thickness of the glass slab as 5.25 mm and apparent thickness of the glass slab as 5.00 mm. Travelling microscope has 20 divisions in one cm on main scale and 50 divisions on vernier scale is equal to 49 divisions on main scale. The estimated uncertainty in the measurement of refractive index of the slab is  where x is _______.

Answer: (41)

27. An inductor of inductance 2μH is connected in series with a resistance, a variable capacitor and an AC source of frequency 7kHz. The value of capacitance for which maximum current is drawn into the circuit is  where the value of x is _______. (Take π = 22/7)

Answer: (3872)

28. A null point is found at 200 cm in potentiometer when cell in secondary circuit is shunted by 5Ω. When a resistance of 15Ω is used for shunting, null point moves to 300 cm. The internal resistance of the cell is _______ Ω.

Answer: (5)

29. For a charged spherical ball, electrostatic potential inside the ball varies with r as V = 2ar2 + b. Here, 𝑎 and 𝑏 are constant and r is the distance from the center. The volume charge density inside the ball is −λaε. The value of 𝜆 is ________.

ε = permittivity of the medium

Answer: (12)

30. A metal block of base area 0.20 m2 is placed on a table, as shown in figure. A liquid film of thickness 0.25 mm is inserted between the block and the table. The block is pushed by a horizontal force of 0.1 N and moves with a constant speed. If the viscosity of the liquid is 5.0 × 10−3 Pl, the speed of block is ________ × 10−3 m/s.

Answer: (25)

Chemistry

SECTION-A

31. According to MO theory the bond orders for O22−, CO and NO+ respectively, are

(1)   1, 2 and 3

(2)   1, 3 and 2

(3)   2, 3 and 3

(4)   1, 3 and 3

Answer: (4)

32. A doctor prescribed the drug Equanil to a patient. The patient was likely to have symptoms of which disease?

(1) Hyperacidity

(2) Anxiety and stress

(3) Depression and hypertension

(4) Stomach ulcers

Answer: (3)

33. Reaction of propanamide with Br2/KOH(aq) produces :

(1)   Propylamine

(2)   Ethylnitrile

(3)   Propanenitrile

(4)   Ethylamine

Answer: (4)

34. The one giving maximum number of isomeric alkenes on dehydrohalogenation reaction is (excluding rearrangement)

(1) 2-Bromopropane

(2) 2-Bromo-3,3-dimethylpentane

(3) 1-Bromo-2-methylbutane

(4) 2-Bromopentane

Answer: (4)

35. An indicator ‘ X ‘ is used for studying the effect of variation in concentration of iodide : on the rate of reaction of iodide ion with H2O2 at room temp. The indicator ‘ X ‘ forms blue colored complex with compound ‘ A ‘ present in the solution. The indicator ‘ X ‘ and compound ‘A’ respectively are

(1) Methyl orange and H2O2

(2) Starch and iodine

(3) Starch and H2O2

(4) Methyl orange and iodine

Answer: (2)

36. The major component of which of the following ore is sulphide based mineral?

(1)   Siderite

(2)   Sphalerite

(3)   Malachite

(4)   Calamine

Answer: (2)

37. A solution of CrO5 in amyl alcohol has a _______ colour.

(1)   Green

(2)   Orange-Red

(3)   Yellow

(4)   Blue

Answer: (4)

38. The set of correct statements is :

(i) Manganese exhibits +7 oxidation state in its oxide.

(ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides.

(iii) Sc shows +4 oxidation state which is oxidizing in nature.

(iv) Cr shows oxidising nature in +6 oxidation state.

(1)  (ii) and (iii)

(2) (i), (ii) and (iv)

(3) (ii), (iii) and (iv)

(4) (i) and (iii)

Answer: (2)

39. Following tetrapeptide can be represented as

(F, L, D, Y, I, Q, P are one letter codes for amino acids)

(1)  PLDY

(2) FIQY

(3) YQLF

(4) FLDY

Answer: (4)

40. Find out the major product for the following reaction.

Answer: (4)

41. Match List I with List II

Choose the correct answer from the options given below :

(1)  A-I, B-III, C-II, D-IV

(2) A-III, B-I, C-IV, D-II

(3) A-III, B-I, C-II, D-IV

(4) A-III, B-II, C-I, D-IV

Answer: (3)

42. Correct order of spin only magnetic moment of the following complex ions is: (Given At.no. Fe: 26, Co : 27)

(1) [FeF6]3− > [Co(C2O4)3]3− > [CoF6]3−

(2) [FeF6]3− > [CoF6]3− > [Co(C2O4)3]3−

(3) [Co(C2O4)3]3− > [CoF6]3− > [FeF6]3−

(4) [CoF6]3− > [FeF6]3− > [Co(C2O4)3]3−

Answer: (2)

43. Match List I with List II

Choose the correct answer from the options given below :

(1) A-II, B-III, C-I, D-IV

(2) A-IV, B-III, C-I, D-II

(3) A-IV, B-I, C-III, D-II

(4) A-II, B-I, C-IV, D-III

Answer: (2)

44. The concentration of dissolved Oxygen in water for growth of fish should be more than X ppm and Biochemical Oxygen Demand in clean water should be less than Y X and Y in ppm are, respectively.

Answer: (2)

45. Find out the major products from the following reaction sequence.

Answer: (4)

46. When a hydrocarbon A undergoes combustion in the presence of air, it requirs 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A ?

(1)   C9H9

(2)   C8H6

(3)   C9H6

(4)   C6H6

Answer: (2)

47. Given below are two statements:

Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats.

Statement II : Silicon forms both electron rich and electron deficient hydrides.

In the light of the above statements, choose the most appropriate answer from the options given below:

(1) Statement I is correct but statement II is incorrect

(2) Both the statements I and II are incorrect

(3) Statement I is incorrect but statement II is correct

(4) Both the statements I and II are correct

Answer: (1)

48. Which of the following relations are correct?

(A) ΔU = q + pΔV         (B) ΔG = ΔH −TΔS

(C) ΔS = qrev/T                (D) ΔH=ΔU−ΔnRT

Choose the most appropriate answer from the options given below:

(1) B and D Only

(2) A and B Only

(3) B and C Only

(4) C and D Only

Answer: (3)

49. Given below are two statements :

Statement I : The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga.

Statement II : The d orbitals in Ga are completely filled.

In the light of the above statements, choose the most appropriate answer from the options given below

(1)  Statement I is incorrect but statement II is correct

(2) Both the statements I and II are correct

(3) Both the statements I and II are incorrect

(4) Statement I is correct but statement II is incorrect

Answer: (1)

50. Match List I and List II

Choose the correct answer from the options given below :

(1)  A-I, B-III, C-IV, D-II

(2) A-III, B-I, C-IV, D-II

(3) A-III, B-I, C-II, D-IV

(4) A-I, B-III, C-II, D-IV

Answer: (2)

SECTION-B

51. Assume that the radius of the first Bohr orbit of hydrogen atom is 0.6Å. The radius of the third Bohr orbit of He+ is _______ picometer. (Nearest Integer)

Answer: (270)

52. Total number of acidic oxides among

N2O3, NO2, N2O, Cl2O7, SO2, CO, CaO, Na2O and NO is _______

Answer: (4)

53. The denticity of the ligand present in the Fehling’s reagent is _______

Answer: (4)

54. The equilibrium constant for the reaction Zn(s) + Sn2+(aq) ⇌ Zn2+(aq) + Sn(s) is 1 × 1020 at 298 K. The magnitude of standard electrode potential of Sn/Sn2+ if  is _______ × 10−2 V (Nearest integer).

Answer: (17)

55. The volume of HCl, containing 73 g L−1, required to completely neutralise NaOH obtained by reacting 0.69 g of metallic sodium with water, is _______ mL.( Nearest Integer) (Given : molar Masses of Na, Cl, O, H, are 23, 35.5, 16 and 1 g mol−1 respectively)

Answer: (15)

56. For conversion of compound A→B, the rate constant of the reaction was found to be 6 × 105 L mol1 s1. The order of the reaction is _________.

Answer: (2)

57. On heating, LiNO3 gives how many compounds among the following? _______ LiO2, N2, O2, LiNO2, NO2

Answer: (3)

58. When 0.01 mol of an organic compound containing 60% carbon was burnt completely, 4.4 g of CO2 was produced. The molar mass of compound is _______ gmol−1 (Nearest integer).

Answer: (200)

59. At 298 K

N2(g) + 3H2(g) ⇌ 2NH3 ( g), K1 = 4 × 105

N2( g) + O2( g) ⇌ 2NO(g), K2 = 1.6 × 1012

K3 = 1.0 × 1013

Based on above equilibria, the equilibrium constant of the reaction,  is _______ × 1033 (Nearest integer).

Answer: (4)

60. A metal M forms hexagonal close-packed structure. The total number of voids in 0.02 mol of it is _______ × 1021 (Nearest integer). (Given NA = 6.02 × 1023 )

Answer: (36)

Mathematics

SECTION-A

61. The statement B ⇒ ((∼A) ∨ B) is equivalent to :

(1) A ⇒ (A ⇔ B)

(2) A ⇒ ((∼A) ⇒ B)

(3) B ⇒(A ⇒ B)

(4) B ⇒ ((∼A) ⇒ B)

Answer: (1, 3 or 4)

62. The value of the integral  is

Answer: (4)

63. The set of all values of λ for which the equation cos2⁡2x − 2sin4⁡x − 2cos2⁡x = λ has a real solution x, is

(1)   [−2, −1]

(2)   [−1, −1/2]

(3)   [−3/2, −1]

(4)   [−2, −3/2]

Answer: (3)

64. Let R be a relation defined on ℕ as a R b if 2a + 3b is a multiple of 5, a, b ∈ ℕ. Then R is

(1)   an equivalence relation

(2)   transitive but not symmetric

(3)   not reflexive

(4)   symmetric but not transitive

Answer: (1)

65. Consider a function f : ℕ → ℝ, satisfying f(1) + 2f(2) + 3f(3) + … + xf(x) = x(x + 1) f(x); x ≥ 2 with f(1) = 1. Then  is equal to

(1)   8100

(2)   8400

(3)   8000

(4)   8200

Answer: (1)

66. If  and  is equal to

(1)   32

(2)   30

(3)   36

(4)   34

Answer: (4)

67. The shortest distance between the lines  and

(1)   5√3

(2)   2√3

(3)   3√3

(4)   4√3

Answer: (4)

68. The plane 2x – y + z = 4 intersects the line segment joining the points A(a, −2, 4) and B(2, b, −3) at the point C in the ratio 2:1 and the distance of the point C from the origin is √5. If ab < 0 and P is the point (a − b, b, 2b − a) then CP2 is equal to

(1)   97/3

(2)   17/3

(3)   16/3

(4)   73/3

Answer: (2)

69. The value of the integral  is equal to

Answer: (1)

70. The letters of the word OUGHT are written in all possible ways and these words are arranged as in a dictionary, in a series. Then the serial number of the word TOUGH is

(1)   84

(2)   79

(3)   89

(4)   86

Answer: (3)

71. The set of all values of t ∈ ℝ, for which the matrix  is invertible, is

(1)   ℝ

(2)

(3)   {kπ, k ∈ ℤ}

(4)

Answer: (1)

72. The area of the region A = {(x, y): |cos x – sin x| ≤ y ≤ sin x, 0 ≤ x ≤ π/2}  is

(1)   √5 + 2√2 – 4.5

(2)

(3)

(4)   √5 – 2√2 + 1

Answer: (4)

73. The number of 3 digit numbers, that are divisible by either 3 or 4 but not divisible by 48, is

(1)   507

(2)   432

(3)   472

(4)   400

Answer: (2)

74. If the lines  and  intersect at the point P, then the distance of the point P from the plane z = a is :

(1)   28

(2)   16

(3)   10

(4)   22

Answer: (1)

75. Let y = y(x) be the solution of the differential equation  If y(2) = 2, then y(e) is equal to

Answer: (2)

76. Let f and g be twice differentiable functions on ℝ such that

fʹʹ(x) = gʹʹ(x) + 6x

fʹ(1) = 4gʹ(1) – 3 = 9

f(2) = 3g(2) = 12.

Then which of the following is NOT true?

(1)   There exists x0 ∈ (1, 3/2) such that f(x0) = g(x0)

(2)   |fʹ(x) – gʹ(x)| < 6 ⇒ −1 < x < 1

(3)   If −1 < x < 2, then |f(x) − g(x)| < 8

(4)   g(−2) − f(−2) = 20

Answer: (3)

77. If the tangent at a point P on the parabola y2 = 3x is parallel to the line x + 2y = 1 and the tangents at the points Q and R on the ellipse  are perpendicular to the line x – y = 2, then the area of the triangle PQR is :

(1)

(2)   3√5

(3)   9/√5

(4)   5√3

Answer: (2)

78. Let  If  is a vector such that  and projection of  then the projection of  equals

(1)   1/5

(2)   5/√2

(3)   3/√2

(4)   1/√2

Answer: (2)

79. Let S = {w1, w2, …….} be the sample space associated to a random experiment. Let  Let A = {2k + 3l; k. l ∈ ℕ} and B = {wn : n ∈ A}. Then P(B) is equal to

(1)   3/64

(2)   1/16

(3)   1/32

(4)   3/32

Answer: (1)

80. Let K be the sum of the coefficients of the odd powers of x in the expansion of (1 + x)99. Let a be the middle term in the expansion of  where m and n are odd numbers, then the ordered pair (l, n) is equal to

(1)   (50, 51)

(2)   (50, 101)

(3)   (51, 99)

(4)   (51, 101)

Answer: (2)

SECTION-B

81. The total number of 4-digit numbers whose greatest common divisor with 54 is 2, is

Answer: (3000)

82. Let a1 = b1 = 1 and an = an – 1 + (n – 1), bn = bn – 1 + an – 1, ∀n ≥ If  then 27 (2S – T) is equal to

Answer: (461)

83. A triangle is formed by the tangents at the point (2, 2) on the curves y2 = 2x and x2 + y2 = 4x, and the line x + y + 2 = 0. If r is the radius of its circumcircle, then r2 is equal to

Answer: (10)

84. Let α1, α2, …., α7 be the roots of the equation x7 + 3x5 – 13x3 – 15x = 0 and |α1| ≥ | α2| ≥ ⋯ ≥ | α7|. Then α1 α2 − α3 α4 + α5α6 is equal to

Answer: (3)

85. Let X = {11, 12, 13, …, 40, 41} and Y = {61, 62, 63, …, 90, 91} be the two sets of observations. If are their respective means and σ2 is the variance of all the observations in X ∪ Y, then  is equal to

Answer: (603)

86. If the equation of the normal to the curve  at the point (1, −3) is x – 4y = 13, then the value of a + b is equal to

Answer: (6)

87. Let A be a symmetric matrix such that |A| = 2 and  If the sum of the diagonal elements of A is s, then βs/α2 is equal to

Answer: (5)

88. Let α = 8 – 14i,  and B = {z ∈ ℂ: |z + 3i| = 4}. Then ∑ZAB(Re z = Im z) is equal to

Answer: (14)

89. A circle with centre (2, 3) and radius 4 intersects the line x + y = 3 at the points P and Q. If the tangents at P and Q intersect at the point S(α, β), then 4α − 7β is equal to

Answer: (11)

90. Let {ak} and {bk}, k ∈ ℕ, be two G. P.s with common ratios r1 and r2 respectively such that a1 = b1 = 4 and r1 < r2. Let ck = ak + bk, k ∈ ℕ. If c2 = 5 and c3 = 13/4 then  is equal to

Answer: (9)

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