solutions - potentialconcept.com · hence the answer is (c). 6. a body weighs 700 gm weight on the...

SOL UTI ON S

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ANSWER KEY

AITS-FT # 05 [SET-A]

DROPPER MEDICAL

(PHYSCIS, CHEMISTRY)

TARGET : NEET 2018-19

Exam. Date : 21-04-2019

AITS-FT # 05 (Medical Dropper) (Solutions SET-A) - 2018-19


Potential & Concept Educations Page. 2

ANSWER KEYS FOR AITS-FT # 04 [SET # A] (TARGET – NEET-2019)DATE : 21-04-2019

ANSWERS [PHYSICS]

1. A 2. C 3. A 4. D 5. C 6. B 7. D 8. B 9. D 10. C11. D 12. A 13. B 14. A 15. B 16. D 17. D 18. C 19. D 20. B21. A 22. D 23. C 24. A 25. B 26. B 27. B 28. A 29. A 30. B31. D 32. C 33. B 34. D 35. D 36. B 37. C 38. C 39. B 40. C41. B 42. C 43. B 44. D 45. B

ANSWERS [CHEMISTRY]

46. C 47. A 48. A 49. A 50. A 51. B 52. B 53. A 54. C 55. C56. C 57. D 58. B 59. C 60. C 61. D 62. A 63. C 64. D 65. B66. D 67. A 68. C 69. A 70. A 71. A 72. D 73. A 74. C 75. B76. D 77. B 78. B 79. D 80. B 81. B 82. A 83. A 84. C 85. B86. D 87. C 88. B 89. A 90. A

ANSWERS [BOTANY]

91. B 92. C 93. B 94. B 95. D 96. D 97. C 98. D 99. C 100. C101. C 102. C 103. D 104. C 105. B 106. C 107. C 108. B 109. A 110. B111. A 112. C 113. A 114. A 115. C 116. B 117. D 118. B 119. B 120. D121. A 122. D 123. B 124. B 125. B 126. C 127. D 128. B 129. C 130. D131. C 132. C 133. B 134. B 135. B

ANSWERS [ZOOLOGY]

136. D 137. D 138. D 139. C 140. B 141. A 142. A 143. C 144. B 145. B146. C 147. C 148. D 149. D 150. B 151. C 152. B 153. C 154. A 155. C156. D 157. A 158. A 159. C 160. C 161. B 162. D 163. C 164. B 165. C166. D 167. A 168. D 169. A 170. A 171. A 172. D 173. C 174. C 175. A176. C 177. A 178. B 179. C 180. D



PHYSICS AITS-FT-05Medical

Dropper Batch

1. Two capacitors of capacitance 2C and C are joined in parallel and charged to potential V. The battery isnow removed and the capacitor C is filled with a medium of dielectric constant K. The potential differenceacross each capacitor will be :-

(A) 3V

K 2(B)

3VK

(C) V

K 2(D)

VK

Solution :

Hence the answer is (A).2. AB is a boundary separating two media of different refractive indices. A ray is incident on the boundary

is partially reflected and partially transmitted. Choose the CORRECT statement

(A) 3 is incident ray and 1 is refracted ray (B) 2 is incident ray and 1 is partially reflected ray(C) 1 is incident ray and 3 is refracted ray (D) 3 is incident ray and 2 is partially reflected raySolution :

Hence the answer is (C).3. A bridge rectifier is shown in figure. Alternating input is given across A and C. If output is taken across

BD, then it is

(A) zero (B) same as input (C) half wave rectified (D) full wave rectifiedSolution :The answer is (A).



4. Equal masses of three liquids A, B & C have temperatures 10°C, 25°C and 40°C respectively. If A & Bare mixed, the mixture has a temperature of 15°C. If B & C are mixed then mixture has temperature of30°C. If A & C are mixed, the mixture will have a temperature of :(A) 29°C (B) 25°C (C) 20°C (D) 16°CSolution :

Hence the answer is (D).

5. A body moves along x-axis with its position as a function of time t given as x = 3t2 – 4t. Find 2

2d xdt

at t =

2 sec.(A) 2 (B) 4 (C) 6 (D) 8Solution :

Hence the answer is (C).6. A body weighs 700 gm weight on the surface of the earth. How much will it weigh on the surface of a

planet whose mass is 17

and radius is half that of the earth.

(A) 200 gm wt (B) 400 gm wt (C) 50 gm wt (D) 300 gm wtSolution :

Hence the answer is (B).7. A thin convex lens is made of a material of refractive index 1.6. An object is kept at a distance of u from

the lens on the principal axis as shown in the figure. The radius of curvature of the surfaces are 10 cm and5cm. Now, the lens is reversed such that the face having radius of curvature 5cm lies close to the object.The difference in image position as obtained for both the cases is equal to :-



(A) 0.4 u (B) 0.6 u (C) 0.8 (D) 0Solution :

Hence the answer is (D).8. In the following combinations of logic gates, the outputs of A, B and C are respectively

(i) (ii)

(iii)

(A) 0, 1, 1 (B) 0, 1, 0 (C) 1, 1, 0 (D) 1, 0, 1Solution :

Hence the answer is (B).9. The ratio of total energy of all molecules of one mole O2 to the total energy of all molecules of two moles

of He at the same temperature is :(A) 2 : 1 (B) 1 : 2 (C) 5 : 4 (D) 5 : 6Solution :

Hence the answer is (D).10. Which of the following statement(s) is are correct?

(A) If the resultant of three forces is zero, then the vectors must be equal magnitude(B) If the resultant of four non-zero forces is zero, then the vectors must be coplanar(C) If the resultant of three non-zero vectors, is zero, then the vectors must be coplanar(D) All of these



Solution :Hence the answer is (C).

11. If on the concentric hollow spheres of radii r and R(>r) the charge Q is distributed such that their surfacedensities are same then the potential at their common centre is

(A) 2 2

0

Q(R r )4 (R r)

(B)

QRR r

(C) Zero (D) 2 20

Q(R r)4 (R r )

Solution :

Hence the answer is (D).12. The far point of a myopic person is 80 cm in front of the eye. What is the eye power of the lens required

to enable him to see very distant objects clearly ?(A) –1.25 D (B) +1.25 D (C) –1.50 D (D) +1.50 DSolution :

Hence the answer is (A).13. To which region of electromagnetic spectrum the frequency 1 GHz corresponding ?

(A) Ultraviolet rays (B) Radiowaves (C) Visible radiation (D) X-raysSolution :Hence the answer is (B).

14. A heated body emits radiation which has maximum intensity at frequency fm. If the temperature of thebody is doubled :(A) The maximum intesity radiation will be at frequency 2fm

(2) The maximum intesity radiation will be at frequency m1 f2

(C) The total emitted energy will increase to 2 times(D) The total emitted energy will increase to 8 times.Solution :

Hence the answer is (A).



15. If the time of flight of a bullet over a horizontal range R is T seconds, the inclination of the direction ofprojection to the horizontal is :-

(A) 2

–1 gTsinR

(B) 2

–1 gTtan2R

(C) 2

–1 2gTcos2R

(D) –1

2Rcot

gT

Solution :

Hence the answer is (B).16. Two opposite and equal charges 4 × 10–8 coulomb when placed 2 × 10–2 cm away, form a dipole. If this

dipole is placed in an external electric field 4 × 108 newton / coulomb , the value of maximum torque andthe work done in rotating it through 180o will be(A) 64 × 10–4 Nm and 64 × 10–4 J (B) 32 × 10–4 Nm and 32 × 10–4 J(C) 64 × 10–4 Nm and 32 × 10–4 J (D) 32 × 10–4 Nm and 64 × 10–4 JSolution :

Hence the answer is (D).17. Light of wavelength 600 nm is incident on a double slit and the interference fringes are formed on a

screen 1 m apart. The separation between two consecutive dark fringes on a screen is found to be 1.2mm. What is the separation between slits.(A) 0.2 mm (B) 0.3 mm (C) 0.4 mm (D) 0.5 mmSolution :

Hence the answer is (D).18. A conducting ring is placed around the core of an electromagnet as shown in figure. When key K is

pressed, the ring -

(A) Remain stationary (B) Is attracted towards the electromagnet



(C) Jumps out of the core (D) None of the aboveSolution :Hence the answer is (C).

19. The equation of a certain gas can be written as: 1/57

2TP

= constant. The specific heat at constant

volume of this gas is : Jin

molK

(A) 0.5 R (B) 1.5 R (C) 2 R (D) 2.5 RSolution :

Hence the answer is (D).20. A hosepipe directs a horizontal jet of water moving with velocity of 20 m/s on a vertical wall. The cross-

sectional area of jet is 10–3m2. If density of water is 1000 kg/m3, then force acting on wall is [Assumingwater comes to rest after striking wall](A) 200 N (B) 400 N (D) 600 N (D) 800 NSolution :

Hence the answer is (B).21. In given circuit find potential difference between P & Q :-

(A) Zero (B) 1 V (C) 2 V (D) 2 V3

Solution :

Hence the answer is (A).



22. A beam of light AO is incident on a glass slab (µ = 1.54) in a direction as shown in fig. The reflected rayOB is passed through a Nicol prism. On viewing through a Nicol prism, we find on rotating the prism that(tan57o = 1.54)

(A) the intensity is reduced down to zero and remains zero(B) the intensity reduces down somewhat and rises again(C) there is no change in intensity(D) the intensity gradually reduces to zero and then again increasesSolution :

Hence the answer is (D).23. A square loop of side 5 cm enters a magnetic field with speed 1 cms–1. The front edge enters the magnetic

field at t = 0 then which graph best depicts emf -

(A) (B)

(C) (D)


24. A point mass oscillates along the x-axis according to the law x = x0cos(t – /4). If the acceleration of theparticle is written as a = A cos(t + ), then :

(A) 20

3A x ,4

(B) 0A x , –4

(C) 20A x ,

4

(D) 20A x , –

4



Solution :

Hence the answer is (A).25. When two particles collide elastically, then impulsive force can't change :-

(A) Momentum of each particle (B) Momentum of system(C) Kinetic energy of each particle (D) Kinetic energy of systemSolution :Hence the answer is (B).

26. Find potential at point ‘x’ in given circuit :-

(A) 10 V (B) –10 V (C) –11 V (D) –9 VSolution :

Hence the answer is (B).



27. The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate.Light source is put on and a saturation photo current is recorded. An electric field is switched on whichhas a vertically downward direction(A) The photo current will increase (B) The kinetic enregy of the electrons will increase(C) The stopping potential will decrease (D) The threshold wavelength will increaseSolution :In electric field photoelectron will experience force and accelerate opposite to the field so it's K.E.increases (i.e. stopping potential will increase), no change in photoelectric current.Hence the answer is (B).

28. The potential difference V and the current i flowing through an instrument in an ac circuit of frequency fare given by V = 5 cos t volts and I = 2 sin t amperes (where = 2f). The power dissipated in theinstrument is -(A) Zero (B) 10 W (C) 5 W (D) 2.5 WSolution :Hence the answer is (A).

29. A transverse sinusoidal wave moves along a string in the positive x-direction at a speed of 10 cm/s. Thewavelength of the wave is 0.5 m and its amplitude is 10 cm. At a particular time t, the snap-shot of thewave is shown in the figure. the velocity of point P when its displacement is 5 cm, is :

(A) 3 jm /s

50

(B) 3 ˆ– jm / s

50

(C) 3 i m /s

50

(D) 3 ˆ– i m / s

50

Solution :Hence the answer is (A).

30. When a rubber band is stretched by a distance x, it exerts a restoring force F = ax + bx2, where a and bare constants. Work done in stretching rubber band by distance L from its unstretched position is :-

(A) 2 31 (aL bL )2

(B) 2 3aL bL

2 3 (C)

2 3aL bL3 5

(D) 2 3aL bL

7 9

Solution :

Hence the answer is (B).31. A magnet is parallel to a uniform magnetic field. If it is rotated by 60°, the work done is 0.8 J. How much

work is done in moving it 30° further(A) 4 J (B) 0.4 J (C) 8 J (D) 0.8 J



Solution :


32. The potential energy of a particle of mass m is given by 0E ; 0 x 1U(x)

0; x 1

1 and 2 are the de-

Broglie wavelength of the particle between 0 x 1 and x > 1 respectively. If the total energy of particle

is 2E0, the ratio 1

2

will be

(A) 2 (B) 1 (C) 2 (D) 12

Solution :

Hence the answer is (C).33. In the figure shown, a liquid is flowing through a tube at the rate of 0.1 m3/sec. The tube is branched into

two semicircular tubes of cross-sectional area A/3 and 2A/3. The velocity of liquid at Q is

(The cross-section of the main tube = A =10–2 m2 and vp = 20 m/sec) :(A) 5 m/sec (B) 30 m/sec (C) 35 m/sec (D) none of theseSolution :

Hence the answer is (A).34. If the length of stretched string is shortened by 40% and the tension is increased by 44%, then the ratio of

the final and initial fundamental frequencies is :(A) 3 : 4 (B) 4 : 3 (C) 1 : 3 (D) 2 : 1



Solution :

Hence the answer is (D).35. A ball of mass 2m is moving with velocity v on a smooth surface collides elastically head-on with another

ball of mass m. If ball of mass m reaches up to top of frictionless elevated plane, then velocity v of heavyball must be :-

(A) 3 gh2 (B)

2gh3 (C)

8gh9 (D)

9gh8

Solution :

Hence the answer is (D).36. The figure illustrate how B, the flux density inside a sample of unmagnetised ferromagnetic material

varies with B0, the magnetic flux density in which the sample is kept. For the sample to be suitable formaking a permanent magnet



(A) OQ should be large, OR should be small (B) OQ and OR should both be large(C) OQ should be small and OR should be large (D) OQ and OR should both be smallSolution :for permanent magnet, both retentivity & coercivity should be largeHence the answer is (B).

37. The half life period of a radioactive element X is same as the mean life time of another redioactiveelement Y. Initially both of them have the same number of atoms. Then(A) X and Y have the same decay rate initially (B) X and Y decay at the same rate always(C) Y will decay at a faster rate than X (D) X will decay at a faster rate than YSolution :

Hence the answer is (C).38. A cubical block of wood of specific gravity 0.5 and a chunk of concrete of specific gravity 2.5 are

fastened together. The ratio of the mass of wood to the mass of concrete which makes the combinationto float with its entire volume submerged under water is :(A) 1/5 (B) 1/3 (C) 3/5 (D) 2/5Solution :

Hence the answer is (C).

39. In the expression for time period T of simple pendulum T 2g

, if the percentage error in time period

T and length are 2% and 2% respectively then percentage error in acceleration due to gravity g is equalto :-(A) 8 % (B) 2% (C) 4% (D) 6%



Solution :

Hence the answer is (D).40. A particle of mass m is tied to string of length and whirled in vertical circle. The difference of tension

and kinetic energy at the highest and lowest position of circular path will be :-(A) 2mg, 5 mg (B) 5 mg, 3 mg (C) 6 mg, 2 mg (D) 3 mg, 5 mgSolution :

Hence the answer is (C).41. Curie temperature is the temperature above which

(A) A paramagnetic material becomes ferromagnetic(B) A ferromagnetic material becomes paramagnetic(C) A paramagnetic material becomes diamagnetic(D) A ferromagnetic material becomes diamagneticSolution :Hence the answer is (B).

42. A transistor is operated in common-emitter configuration at VC = 2 V such that a change in the basecurrent from 100 µA to 200 µA produces a change in the collector current from 5 mA to 10 mA. Thecurrent gain is(A) 100 (B) 150 (C) 50 (D) 75Solution :



Hence the answer is (C).43. A steel ring of radius r and cross-sectional area A is fitted on to a wooden disc of radius R(R > r). If Young’s

modulus be Y, then the force with which the steel ring is expanded is :

(A) RAYr

(B) R – rAY

r

(C) Y R – rA r

(D) YrAR

Solution :

Hence the answer is (B).44. A particle is dropped from rest and another particle is thrown downward simultaneously with initial speed

u, then :-

(A) Time after which their separation becomes h, is hu

(B) Their relative velocity is always u(C) Their relative acceleration is always zero(D) All of theseSolution :Hence the answer is (D).

45. A square plate of mass m and side a has moment of inertia about an axis perpendicular to its plane andpassess through one of its corner is ma2. Then is :-

(A) 43

(B) 23

(C) 13

(D) 73

Solution :

Hence the answer is (B).



CHEMISTRY AITS-FT-05Medical

Dropper Batch

46. Order of stability of enol contenet

3 3(a )

O||

CH C CH 3 2 3(b)

O O|| ||

CH C CH C CH 3 2(c)

O O|| ||

CH C CH C O Et

(A) a > b > c (B) b > a > c (C) b > c > a (D) a > b > c


47. Stability order of the following resonating structure will be :

(A) i > ii > iii > iv (B) ii > i > iii > iv (C) iii > ii > i > iv (D) i > iii > ii > iv


48.

Products (B) and (C) are:(A) Geometrical isomers (B) Enantiomer(C) Positional isomer (D) structural isomer


49. Cosider the following reactions :

Products [P] and [Q] respectively are :(A) 2,3-Dimethyl-2-butanol and 3,3-Dimethyl-2-butanol(B) 2,3-Dimethyl-2-butanol and 2,3-Dimethyl-2-butanol(C) 3,3-Dimethyl-2-butanol and 3,3-Dimethyl-2-butanol(D) 3,3-Dimethyl-2-butanol and 3,3-Dimethyl-2-butanol


50. Which of the following combinations is correctly matched ?

(A) (B)



(C) (D)


51.

Product of above reaction is :

(A) (B)

(C) (D)

Solution :Hence the answer is (B).

52. The compound : can form a hemiacetal by reacting with itself in solution. What is the structure of the hemiacetal ?

(A) i (B) ii (C) iii (D) iv


53. In the given reaction :

Product (X) is

(A) (B) COOH — CH2 — CH2 — COOH

(C) (D)


54.

Product (A) is :

(A) (B) (C) (D) Ph – CH2 – OH




55. Product (B) is :

(A) (B) (C) (D)


56. Which of the following reactions of glucose can be explained only by its cyclic structure ?(A) Glucose forms Pentaacetate.(B) Glucose reacts with hydroxylamine to form an oxime.(C) Pentaacetate of glucose does not react with hydroxylamine.(D) Glucose is oxidised by nitric acid to gluconic acid.


57. Which one of the following is the correct representarion of tripeptide i.e., (alanine-glycine-alanine) ?

(A) (B)

(C) (D)

Solution :Hence the answer is (D).

58. Which of the following polymers is not correctly matched ?(A) Formation of dacron – Step Growth polymerization(B) Formation of polytetrafluoroethene – Step growth polymerization(C) Formation of polythene – Chain growth polymerisation in presence of benzoyl peroxide(D) Formation of polyacrylonitrile – Chain growth polymerisation in presence of peroxide


59. Match the polymers given in column I with monomers in column II and select the correct option :Column-I Column-II

(A) Bakelite (i)

(B) Natural rubber (ii) 3

2 2

CH|

CH C CH CH CH

(C) Neoprene (iii) 2 2

Cl|

CH C CH CH CH

(D) Melamine-formaldehydepolymer

(iv)




60. Which of the following are anionic detergents ?I. Sodium salts of sulphonated long chain alcohol.II. Ester of stearic acid ancl polyethylene glycol.III. Quarternary ammonium salt of amine with acetate ion.IV. Sodium salts of sulphonated long chain hydrocarbons.The correct option is(A) I and II (B) II and III (C) I and IV (D) II and IV


61. What volume of air at 1 atm and 273 K containing 21% of oxygen by volume is required to completelyburn sulphur (S8) present in 200 g of sample, which contains 20% inert material which does not burn.Sulphur burns according to the reaction

8 2 21 S (s) O (g) SO (g)8

(A) 23.52 litre (B) 320 litre (C) 112 litre (D) 533.33 litre

Solution :

Hence the answer is (D).62. 6 × 10–3 mole K2Cr2O7 reacts completely with

9 × 10–3 mole Xn+ to give 3XO and Cr3+. The valueof n is(A) 1 (B) 2 (C) 3 (D) None of these

Solution :

Hence the answer is (A).63. The quantum number of four electrons (e1 to e4) are given below

n l m se1 3 0 0 +1/2e2 4 0 0 1/2e3 3 2 2 –1/2e4 3 1 –1 1/2The correct order of decreasing energy of these electrons is :



(A) e4 > e3 > e2 > e1 (B) e2 > e3 > e4 > e1(C) e3 > e2 > e4 > e1 (D) e1 > e4 > e2 > e3

Solution :

Hence the answer is (C).64. If radiation corresponding to second line of "Balmer series" of Li2+ ion, knocked out electron from first

excited state of H-atom, then kineic enery of ejected electron would be(A) 2.55 eV (B) 4.25 eV (C) 11.25 eV (D) 19.55 eV

Solution :

Hence the answer is (D).65. 6 ×1022 gas molecules each of mass 10–24 kg are taken in a vessel of 10 litre. What is the pressure exerted

by gas molecules ? The root mean square speed of gas molecules is 100 m/s.(A) 20 Pa (B) 2 × 104 Pa (C) 2 × 105 Pa (D) 2 × 107 Pa

Solution :

Hence the answer is (B).66. Consider the reaction at 300 K

H2(g) + Cl2(g) 2HCl(g); Ho = –185 kJIf 2 mole of H2 completely react with 2 mole of Cl2 to form HCl, what is Uo for this reaction ?(A) (B) –185 kJ (C) 370 kJ (D) None of these



Solution :

Hence the answer is (D).67. Calculate the enthalpy for the following reaction using the given bond energies (kJ/mol) :

(C—H = 414; H—O = 463; H—Cl = 431,C—Cl = 326; C—O = 335)CH3—OH(g) + HCl(g) CH3—Cl(g) + H2O(A) –23 kJ/mol (B) – 42 kJ/mol (C) – 59 kJ/mol (D) –511 kJ/mol

Solution :

Hence the answer is (A).68. 5 moles of SO2 and 5 moles of O2 are allowed to react. At equilibrium, it was found that 60% of SO2 is

used up. If the pressure of the equilibrium mixture is one atmosphere, the partial pressure of O2 is(A) 0.52 atm (B) 0.21 atm (C) 0.41 atm (D) 0.82 atm

Solution :

Hence the answer is (C).69. If 20 mL of 0.1 M NaOH is added to 30 mL of 0.2 M CH3COOH (pKa = 4.74), the pH of the resulting

solution is(A) 4.44 (B) 9.56 (C) 8.96 (D) 9.26

Solution :

Hence the answer is (A).70. Silver ions are added to a solution with [Br–] = [Cl–] = 2 3

3 4[CO ] [AsO ] = 0.1M. Which compound willprecipitate with lowest [Ag+] ?(A) AgBr (Ksp = 5 × 10–13) (B) AgCl (Ksp = 1.8 × 10–10)(C) Ag2CO3 (Ksp = 8.1 × 10–12) (D) Ag3AsO4 (Ksp = 1 × 10–22)



Solution :

Hence the answer is (A).71. The composition of N2O5 in carbon tetrachlorie was followed by measuring the volume of O2 gas evolved

: 2N2O5 (CCl4) 2N2O4 (CCl4) + O2(g). The maximum volume of O2 gas obtained (in min–1) for thedisappearance of N2O5 is :

(A) 2.303500

(B) 2.303 100log500 90

(C) 2.303 90log500 100

(D) 100

10 500

Solution :

Hence the answer is (A).72. The activation energy of the reaction, A + B C + D + 38 kcal is 20 kcal. What would be the

activation energy of the following reaction.C + D A + B(A) 20 kcal (B) –20 kcal (C) 18 kcal (D) 58 kcal

Solution :

Hence the answer is (D).73. In a concentration cell the same reagents are present in both the anode and cathode compartments, but at

different concentrations. Calculate the emf of a cell containing 0.040 M. Cr3+ in one compartment and 1.0M Cr3+ in the other if Cr electrodes are used in both.(A) 0.028 V (B) 0.249 V (C) 0.083 V (D) 0.125 V



Solution :

Hence the answer is (A).74. The specific conductane of a saturated solution of silver bromide is 1Scm . The limiting ionic conductivity

of Ag+ and Br– ions are x and y, respectively. The solubility of silver bromide in gL–1 is : (molar mass ofAgBr = 188)

(A) 1000

x y

(B) 188x y

(C)

1000 188x y

(D)

x y 1000188

Solution :

Hence the answer is (C).75. If the elevation in boiling point of a solution of non-volatile, non-electrolytic and non-associating solute in

solvent (Kb = x K.kg.mol–1) is y K, then the depression in freeing point of solution of same concentrationwould be (Kf of the solvent = z K. kg.mol–1)

(A) 2xzy (B)

yzx

(C) xzy (D)

yz2x

Solution :

Hence the answer is (B).76. Which one of the following statements is false ?

(A) The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is BaCl2> KCl > CH3COOH > sucrose(B) Isotonic solutions are those solutions which have the same osmotic pressure(C) Raoult's law states that the vapour pressure of a component over a solution is proportionnal toits mole fraction in liquid state(D) Two sucrose solutions of same molality prepared in different solvents will have the samefreezing point depression

Solution :




77. Ammonium chloride crystallized in a body centered cubic lattice with edge length of unit cell equal to 387pm. If the size of Cl– ion is 181 pm, the size of 4NH ion would be(A) 116 pm (B) 154 pm (C) 174 pm (D) 206 pm

Solution :

c a3ar r2

Hence the answer is (B).78. Select right expression for determining packing fraction (P. F.) of NaCl unit cell (assuming ideal), if ions

along an edge diagonal are absent :

(A) 3 3

3

4 (r r )3P.F.16 2 r

(B)

3 3

3

4 5 r 4r3 2P.F.

16 2 r

(C)

3 3

3

4 5r r3 2P.F.

16 2 r

(D)

3 3

3

4 7 r r3 2P.F.

16 2 r

Solution :

Hence the answer is (B).79. Select incorrect statement :

(A) Gold sol is multimolecular colloid(B) Large number of particles of a substance aggregate together and formedmultimolecular colloids(C) Metal sulphides are lyophobic colloids(D) Sulphur sol is multimolecular colloid and hydrophillic in nature

Solution :Sulphur solution is multimolecular by hydrophobic in nature.Hence the answer is (D).

80. Which of the following is true in respect of chemical adsorption ?(A) H < 0, S > 0, G > 0 (B) H < 0, S < 0, G < 0(C) H > 0, S > 0, G < 0 (D) H > 0, S < 0, G > 0

Solution :>>>Hence the answer is (B).

81. Which of the following is the incorrect match for atom of element ?(A) [Ar]3d54s1 4th period, 6th group(B) [Kr]4d10 5th period, 12th group(C) [Rn]6d27s2 7th period, 3rd group(D) [Xe]4f145d26s2 6th period, 4th group

Solution :>>>Hence the answer is (B).



82. The hybridisation of central iodine atom in 5 3 3IF , I and I are respectively

(A) sp3d2, sp3d, sp3 (B) sp3d, sp3d, sp3 (C) sp3d2, sp3d2, sp3 (D) sp3d, sp3d2, sp3


83. The magnetic moment of [MnX4]2– is 5.9 BM. The geometry of the complex ion is :(X = monodentate halide ion)(A) tetrahedral (B) square planar (C) both are possible (D) none of these


84. The crystal fieldstabilisation energy of [Co(NH3)6]Cl3 is(A) –7.2 0 (B) –0.4 0 (C) –2.4 0 (D) –3.6 0


85. Choose the correct code regarding Roasting process.(I) It is the process of heating ore in air to obtain the oxide(II) It is exothermic process(III) It is used for hydrated oxide and oxysalt ore(IV) It is used after the concentration of ore(A) I, II and III (B) I, II and IV (C) I, III and IV (D) II, III and IV


86. Li does not resemble with other alkali metals in following properties :(A) Li2CO3 decomposes into oxides while other alkali metal carbonates are thermally stable(B) LiCl is predominantly covalent(C) Li3N is formed, when Li metal is heated with N2 gas(D) all are correct

Solution :Hence the answer is (D).

87. Na2B4O7.10H2O HeatX +NaBO2 + H2O, X + Cr2O3 Heat (Green coloured)Y

X and Y are(A) Na3BO3 and Cr(BO2)3 (B) Na2B4O7 and Cr(BO2)3(C) B2O3 and Cr(BO2)3 (D) B2O3 and CrBO3


88. In thiosulphuric acid(A) each sulphur atom is in identical oxidation state(B) there is a S = S linkage present(C) one S atom is in +2 and other sulphur atom is in +4 oxidation state(D) there is only one replaceable hydrogen atomSolution :Hence the answer is (B).



89. Many transition metals form interstitial compounds. The characteristics of these interstitial compoinds are(I) They have high melting points, higher than those of pure metals(II) They are very hard(III) They retain metallic conductivity(IV) They are chemically more reactive than the pure metals(A) I, II, III (B) I, III (C) II, IV (D) IV onlySolution :Hence the answer is (A).

90. In context of the lanthanoids, which of the following statements is not correct ?(A) Availability of 4f electrons results in the formation of compounds in +4 state for all the membersof the series(B) There is a gradual decrease in the radii of the members with increasing atomic number in theseries(C) All the members exhibit +3 oxidation state(D) Because of similar properties the separation of lanthanoids is not easy


solutions - potentialconcept.com · hence the answer is (c). 6. a body weighs 700 gm weight on the...

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