KEAM 2025: KEAM B.Pharm entrance (Physics and Chemistry), session 1
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FINAL ANSWER KEY
Question Paper Code: 9/2025/OL
Exam:KEAM 2025 BPHARM-1
Date of Test: 24-04-2025
A solution contains 9.8 g of H SO . How much NaOH is required to completely neutralize
1.
it? (molar mass of NaOH = 40 g mol )
A) 0.4 g
B ) 0.2 g
C) 8g
D ) 1.2 g
E ) 1.6 g
Correct Answer : Option C
Which of the following statements are correct about canal rays?
(i) They carry positively charged particles.
(ii) The mass of the particles of these rays does not depend upon the gas present in the
2. cathode ray tube.
(iii) The particles behave in a different manner in electric field as those of cathode rays.
(iv) The charge to mass ratio of the particles does not depends on the gas present in the
cathode ray tube.
A ) (ii) and (iv)
B ) (i) and (iv)
C ) (i) and (ii)
D ) (ii) and (iii)
E ) (i) and (iii)
Correct Answer : Option E
A sub-atomic particle of mass 2.2x10 kg is moving with a velocity of 3.0x10 ms
3.
. What is its de Broglie wavelength? (Planck’s constant h = 6.6x10 Js)
A) 1 pm
B ) 0.1 pm
C ) 2 pm
D ) 0.2 pm
E ) 0.5 pm
Correct Answer : Option B
4. Which of the following is a metalloid?
A) Antimony
B ) Aluminium
C ) Magnesium
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D) Phosphorus
E ) Calcium
Correct Answer : Option A
5. Main group elements are
A) s-block elements only
B ) p-block elements only
C ) both s-and p-block elements
D ) d-block elements only
E ) 4f and 5f-block elements
Correct Answer : Option C
6. In which of the following compounds there is an expanded octet around the central atom?
A) SCl
B ) NO
C ) NH
D ) PCl
E ) H SO
Correct Answer : Option E
7. Which of the following molecule has tetrahedral geometry?
A) SF
B ) PCl
C ) BF
D ) BeCl
E) NH
Correct Answer : Option E
8. Enthalpy change is always negative for which one of the following processes?
A) Enthalpy of ionisation
B ) Enthalpy of sublimation
C ) Enthalpy of vapourisation
D ) Enthalpy of bond dissolution
E ) Enthalpy of combustion
Correct Answer : Option E
What are the thermodynamic conditions for a reaction to be spontaneous at low
9. temperature and non-spontaneous at high temperature?
A) Δ H > 0, Δ S > 0
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B) Δ H < 0, Δ S > 0
C ) Δ H > 0, Δ S < 0
D ) Δ H < 0, Δ S < 0
E ) Δ H > 0, Δ S = 0
Correct Answer : Option D
A monobasic acid HA has pH of 3 in 0.1M solution at 298 K. What is the pKa of the acid at
10. 298 K?
A) 3
B) 4
C) 5
D) 6
E) 2
Correct Answer : Option C
11. The ion with the highest limiting molar conductance at 298 K is
A) H
B ) Na
C) K
D ) Ca
E ) Mg
Correct Answer : Option A
What is the quantity of current required to deposit one mole of metallic magnesium from
12. fused magnesium chloride? (1F=96500C)
A) 1.93 × 10 C
B ) 1.93 × 10 C
C ) 9.65 × 10 3C
D) 9.65 × 10 C
E ) 1.93 × 10 C
Correct Answer : Option E
13. Which of the following gas has highest solubility in water at 298 K?
A) Formaldehyde
B ) Methane
C) CO
D) Vinyl chloride
E ) Argon
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Correct Answer : Option A
14. What is the unit of rate constant for a second order reaction?
A ) mol L s
B ) mol L s
C ) mol Ls
D ) mol L s
E) L s
Correct Answer : Option C
15. Which of the following is an incorrect statement?
A) For a zero order reaction the rate of the reaction is independent of reactant concentration.
In a first order reaction the half-life period does not depend on the initial reactant
B)
concentration.
C ) For a chemical reaction the rate constant increases with increase in temperature.
In a zero order reaction plot of reactant concentration against time is a straight line with
D)
negative slope.
In a first order reaction, the time required for 75% completion of the reaction is thrice the
E)
half-life period.
Correct Answer : Option E
16. Which of the following is a colourless transition metal ion?
A ) Ca
B ) Cr
C ) Ti
D ) Fe
E ) Fe
Correct Answer : Option C
17. The 3d metal that forms fluoride in +6 oxidation state is
A) Titanium
B ) Chromium
C ) Vanadium
D ) Manganese
E ) Cobalt
Correct Answer : Option B
18. The transition metal oxide used as a catalyst in the manufacture of sulphuric acid is
A) Nickel (II) oxide
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B) Vanadium (III) oxide
C ) Chromium (III) oxide
D ) Chromium (II) oxide
E ) Vanadium (V) oxide
Correct Answer : Option E
19. The transition metal ion with the least ionic radius (in pm) is
A ) Sc
B ) Ti
C) V
D ) Cr
E ) Mn
Correct Answer : Option D
20. KMnO is prepared from Mn(II) ion salts by oxidizing it with
A ) KClO
B) K S O
C ) KNO
D ) KClO
E ) KOH
Correct Answer : Option B
21. The lanthanoid with the outer electronic configuration 4f 5d 6s is
A) Neodymium
B ) Samarium
C ) Europium
D ) Gadolinium
E ) Holmium
Correct Answer : Option D
22. The IUPAC name of the complex [Co(NH ) (H O) ]Cl is
A) triaquatriamminecobalt(III) chloride
B ) triamminetriaquacobalt(III) chloride
C ) triaquatriamminecobalt(II) chloride
D ) triamminetriaquacobalt(II) chloride
E ) triaquatriamminecobalt(III) trichloride
Correct Answer : Option B
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23. The complexes [Co(NH ) Br]SO and [Co(NH ) SO ]Br are examples of
A) Linkage isomerism
B ) Solvate isomerism
C ) Coordination isomerism
D ) Ionization isomerism
E ) Geometrical isomerism
Correct Answer : Option D
24. The metal ion present in the Wilkinson’s catalyst is
A) Nickel
B ) Platinum
C ) Iron
D ) Rhodium
E ) Chromium
Correct Answer : Option D
25. Which of the following is a spin free complex?
A ) [Ni(CO) ]
B) [Co(NH ) ]
C) [Ni(CN) ]
D) [CoF ]
E) [Mn(CN) ]
Correct Answer : Option D
The type of hybridization of the carbon atoms from left to right in CH − CH = CH − CN
26.
is
A) sp , sp, sp, sp
B ) sp , sp , sp, sp
C ) sp , sp , sp , sp
D ) sp , sp , sp , sp
E ) sp , sp , sp, sp
Correct Answer : Option C
27. Which of the following group shows –R effect?
A ) – OH
B ) – OCOR
C ) −NH
D ) −CN
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E) −OR
Correct Answer : Option D
28. The hydrocarbon with molecular formula C H is
A) Didodecane
B ) Didecane
C ) Dodidecane
D ) Didocene
E ) Eicosane
Correct Answer : Option E
When n-hexane is passing over Mo O catalyst at 773K and 10-20 atm pressure, the
29. product formed is
A) 1–hexene
B ) 3-hexene
C ) cyclohexane
D ) benzene
E ) cyclohexene
Correct Answer : Option D
One mole of an alkene on ozonolysis gives one mole of propan-2-one and one mole of
30. formaldehyde What is the alkene?
A) 2-Butene
B ) 1-Butene
C ) Isobutene
D ) 2-Methyl-2-butene
E ) 2,3-Dimethyl-2-butene
Correct Answer : Option C
31. The correct decreasing order of acidity of alkynes is
A ) CH ≡ CH ˃ CH − C ≡ CH ˃ CH − C ≡ C − CH
B ) CH − C ≡ C − CH ˃ CH ≡ CH ˃ CH − C ≡ CH
C ) CH − C ≡ CH ˃ CH ≡ CH ˃ CH − C ≡ C − CH
D ) CH ≡ CH ˃ CH − C ≡ C − CH ˃ CH − C ≡ CH
E ) CH − C ≡ CH ˃ CH − C ≡ C − CH ˃ CH ≡ CH
Correct Answer : Option A
32. When toluene is treated with Cl in the presence of Fe in dark, the product formed is
A) Benzyl chloride
B ) mixture of o- & p-Chlorotoluene
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C) 2,4,6-Trichlorotoluene
D ) 2,4-Dichlorotoluene
E ) Benzal dichloride
Correct Answer : Option B
33. Which of the following compound is used for the manufacture of phenol in large scale?
A) Chlorobenzene
B ) Benzene
C ) Aniline
D ) Cumene
E ) Cyclohexane
Correct Answer : Option D
34. When aryl halide is treated with Na in dry ether, biphenyl is formed. This reaction is called
A) Fittig reaction
B ) Wurtz-Fittig reaction
C ) Swarts reaction
D ) Williamson’s synthesis
E ) Kolbe’s reaction
Correct Answer : Option A
35. Asprin is
A) methyl salicylate
B ) sodium benzoate
C ) acetyl salicylic acid
D ) 2-methyl salicylic acid
E ) ethyl salicylate
Correct Answer : Option C
36. Phenol is converted into benzene by heating with
A ) Na / Hg
B ) Zn dust
C ) Cr O
D ) LiAlH
E ) NaBH
Correct Answer : Option B
37. Intramolecular hydrogen bonding is present in
A) Water
B ) Methanol
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C) Phenol
D ) o-Nitrophenol
E) p-Nitrophenol
Correct Answer : Option D
38. Which of the following is the weakest acid?
A ) FCH COOH
B ) NC − CH COOH
C ) Cl C − COOH
D ) O N − CH COOH
E ) Cl CHCOOH
Correct Answer : Option A
Benzaldehyde reacts with acetophenone in the presence of NaOH at 293 K to give
39. benazlacetophenone. This reaction is an example of
A) Cannizzaro reaction
B ) aldol condensation
C ) Wolf-Kishner reduction
D ) Clemmensen reduction
E ) cross aldol condensation
Correct Answer : Option E
Which of the following carboxylic acid is used in rubber, textile, dyeing, leather and
40. electroplating industries?
A) Methanoic acid
B ) Ethanoic acid
C ) Benzoic acid
D ) Salicylic acid
E ) Butanoic acid
Correct Answer : Option A
41. Acetanilide is prepared by treating acetic anhydride/pyridine with
A) Ethanamine
B ) Methanamie
C ) Benzenamine
D ) N-Methylaniline
E ) N-Methylethanamine
Correct Answer : Option C
42. Which of the following amine does not react with Hinsberg’s reagent?
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A) Methanamine
B ) N-Methylethanamine
C ) N,N-Dimethylethanamine
D ) 1-Propanamine
E ) 2-Propanamine
Correct Answer : Option C
43. Aryl fluorides are prepared from diazonium salts using
A ) NaF
B ) KF
C ) BF
D ) AlF
E ) HBF
Correct Answer : Option E
44. Which of the following amino acid can be synthesized in the body?
A) Proline
B ) Leucine
C ) Valine
D ) Arginine
E ) Histidine
Correct Answer : Option A
Match the following;
a) Aldohexose i) Maltose
b) Ketohexose ii) Glycogen
45. c) Non-reducing disaccharide iii) Glucose
d) Reducing disaccharide iv) Sucrose
e) Polysaccharide v) Fructose
A ) a)-(iii); b)-(v); c)-(iv); d)-(i); e)-(ii)
B ) a)-(iii); b)-(ii); c)-(i); d)-(v); e)-(iv)
C ) a)-(i); b)-(ii); c)-(iii); d)-(v); e)-(iv)
D ) a)-(iii); b)-(iv); c)-(v); d)-(i); e)-(ii)
E ) a)-(iii); b)-(ii); c)-(iv); d)-(i); e)-(v)
Correct Answer : Option A
46.
A) LMT
B) L ∘MT
C ) LMT
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D) L ∘M ∘T ∘
E) L M T
Correct Answer : Option D
An object when dropped from a height ℎ from the ground, reaches the ground in t s. The
47. time after which the object was passing through a point at a height ℎ / 2 from the ground
is
A) √2t
B)
√
C)
D) 2t
E)
Correct Answer : Option B
^ and B
48. The angle between two unit vectors A ^ is 60 ∘ . The value of ^−B
A ^ is
A)
B)
C)
D) 1
E)
Correct Answer : Option D
49. A person standing on the platform of a lift will experience weight loss, when the lift moves
A) downward with uniform velocity
B ) upward with constant acceleration
C ) downward with constant acceleration
D ) upward with uniform velocity
E ) upward with variable acceleration
Correct Answer : Option C
Three forces F , F and F acting on a body of mass m keep the body stationary. If the
50. forces F and F are mutually perpendicular, the acceleration of the body when the force
F is removed is
A)
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B)
( )
C)
D)
E)
Correct Answer : Option A
A body initially at rest undergoes linear motion with constant acceleration under the action
51. of a constant force. Then the power delivered to the body at time t is proportional to
A) t /
B) t
C) t
D) t
E) t /
Correct Answer : Option B
52. Pick out the INCORRECT statement from the following
A) Work done in uniform circular motion is zero
B ) When a body is in dynamic equilibrium, work done is zero
C ) Work done is positive for a freely falling body under gravity
D ) Work done in a stretched string is positive
E ) Work done depends on the time taken to complete the work
Correct Answer : Option E
A shell travelling along a parabolic path in the gravitational field of the earth undergoes
53. explosion in mid air. The centre of mass of the fragments will move
A) horizontally and then vertically down
B ) along the original parabolic path
C ) vertically down
D ) vertically up and then vertically down
E ) horizontally and then in the parabolic path
Correct Answer : Option B
The ratio of radius of gyration of a circular ring to that of a circular disc, each of same mass
54. and same radius about their respective central axes is
A) √2: √3
B) 1: √2
C ) √3: √2
D ) √2: 1
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E) 1: 1
Correct Answer : Option D
Two bodies of masses m and 4m are kept at a distance of x . The distance on the axial
55. point from m at which the gravitational field is zero is
A)
B)
C)
D)
E)
Correct Answer : Option A
56. Work done in a stretched wire is
A ) Load × strain
B) × load × strain
C) Young s modulus × strain
D) × Load × extension
E) × load × extension
Correct Answer : Option E
57.
A)
B)
C)
D)
E)
Correct Answer : Option B
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If the value of C / C is unity in the equation PV = constant, then the process is
58. (C = specific heat capacity at constant pressure
C = specific heat capacity at constant volume)
A) adiabatic
B ) isochoric
C ) isothermal
D ) isobaric
E ) irreversible
Correct Answer : Option C
The temperature at which the r.m.s. velocity of oxygen molecule is equal to that of
59. hydrogen molecule at 20 K is
A) 300 K
B ) 320 K
C ) 330 K
D ) 400 K
E ) 375 K
Correct Answer : Option B
A particle executes linear simple harmonic motion and its potential energy (P.E), kinetic
60. energy (K.E) and total energy (T.E) are measured as functions of displacement x from the
mean position at the origin. Then
A ) K.E. is minimum when x = 0
B ) T.E. is zero when x = 0
C ) P.E. is maximum when x = 0
D ) K.E. is maximum when x is maximum
E) P.E. is maximum when x is maximum
Correct Answer : Option E
A closed organ pipe and an open organ pipe have the same length. The ratio of the
61. frequencies in their third mode of vibrations is
A) 3:1
B) 2:3
C) 5:6
D) 4:5
E) 3:5
Correct Answer : Option C
A point charge −q , is placed at a distance x from an isolated conducting plane. The
62. electric field at any point P on the other side of the plane is directed
A) radially away from the point charge
B ) towards the plane perpendicularly
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C) radially towards the point charge
D ) away from the plane perpendicularly
E ) parallel to the surface of the conducting plane
Correct Answer : Option B
Three capacitors each of capacitance 12 μ F , are connected in series. When this
63. combination is connected to a battery of 12 V, the charge drawn from the battery is
A) 32 μ C
B ) 24 μ C
C ) 48 μ C
D ) 16 μ C
E ) 12 μ C
Correct Answer : Option C
64. Pick out the INCORRECT statement
A) Kirchhoff’s junction rule is based on conservation of energy
B ) Ohm’s law asserts that the plot of current I versus potential V is linear
C ) Current is a scalar quantity
D ) Electrical conductivity is the reciprocal of electrical resistivity
E ) Current density is a vector quantity
Correct Answer : Option A
An electric cell does 10 J of work in carrying a charge of 5 C around a simple closed circuit.
65. The electromotive force of the cell is
A) 0.5 V
B ) 1.5 V
C) 1V
D) 6V
E) 2V
Correct Answer : Option E
A wire of length 1.2 m carrying a current of 4 A , when placed in a uniform magnetic field
of
66. 5 T experiences a force of 12 N . Then the angle between the direction of current and
the
magnetic field is
A) 30 ∘
B ) 45
∘
C ) 60
∘
D) 0
∘
E ) 90
∘
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Correct Answer : Option A
When a proton moves in a uniform magnetic field such that its velocity has a component
67. along the direction of magnetic field, its trajectory will be a
A) circle
B ) straight line
C ) helix
D ) parabola
E ) ellipse
Correct Answer : Option C
An iron ring is held horizontally and a bar magnet is dropped gently through the ring with its
length coinciding with the axis of the ring. The acceleration of the freely falling magnet
68. through the ring
(g = acceleration due to gravity)
A) is less than g
B) is equal to g
C ) is greater than g
D ) depends on the radius of the ring
E ) depends on the length of the magnet
Correct Answer : Option A
In a plane electromagnetic wave, the magnetic field is given by
69. B = 400 × 10 sin (4.0 × 10 )(t − x / c)
T .The peak value of electric field (in Vm – ) is
A) 8 × 10
B ) 6 × 10
C ) 4 × 10
D ) 3 × 10
E ) 12 × 10
Correct Answer : Option E
A convex lens having power P is cut into two halves perpendicular to the principal axis.
70. Then the power of each piece is
A) P
B)
C) 2P
D)
E) 4P
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Correct Answer : Option B
In Young’s double slit experiment performed in air medium, the fringe width observed is 1.4
71. mm. If the entire arrangement is kept in a liquid medium of refractive index 1.4, then the
fringe width (in mm) will be
A ) 1.4
B ) 1.0
C ) 0.7
D ) 2.8
E ) 0.5
Correct Answer : Option B
When blue light is incident on a certain metal surface, photoelectrons are emitted. When
72. green light is incident on the same metallic surface, no electrons are emitted. If the same
metallic surface is exposed to yellow light,
A ) less energetic electrons will be emitted
B ) no electrons will be emitted
C ) more energetic electrons will be emitted
D ) electron emission depends on the intensity of light
E ) electron emission depends on the time of exposure
Correct Answer : Option B
Ionization potential of hydrogen atom is 13.6 eV . Hydrogen atom in the ground state
73. initially is excited by monochromatic radiation of photon energy 12.75 eV . The number of
spectral lines emitted by the hydrogen atom, according to Bohr’s theory will be
A) 2
B) 4
C) 3
D) 6
E) 5
Correct Answer : Option D
74. When a radioactive material emits an α -particle, its position in the periodic table
A) is lowered by three places
B ) is increased by two places
C ) remains unchanged
D ) is lowered by two places
E ) is increased by one place
Correct Answer : Option D
75. The band gap energy of silicon is
A ) 1.1 eV
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B) 0.7 eV
C) 1.7 eV
D) 2.1 eV
E) 0.5 eV
Correct Answer : Option A
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