Chemistry Online Test for JEE, NEET and EAMCET Exams

1. Phenol can be distinguished from ethanol by the following reagents except

1) sodium

2) NaOH / I₂

3) Neutral FeCl3

4) Br₂ / H₂O

2. The rate of a first order reaction is 1.5 ×10^-2
mol L^-1 min^-1 at 0.5 M concentration of the reactant. The
half life of the reaction is

1) 23.1 min

2) 8.73 min

3) 7.53 min

4) 0.383 min

3. Which of the following is used as “morning after pill”?

1) Ethynyl estradiol

2) Mifepristone

3) Norethindrone

4) Promethazine

4. For the given complex ,[CoCl₂(en)(NH₃)]⁺the number of geometrical isomer’s, the number of optical isomers and the total number of isomers of all type
possible respectively are

1) 2,2 and 4

2) 2,0 and 2

3) 2,2 and 3

4) 0,2 and 2

5. The correct order of E⁰_M⁺²_/Mvalues with negative sign for the four successive elements Cr,Mn,Fe and Co is

1) Cr > Mn > Fe > Co

2) Cr > Fe > Mn > Co

3) Fe > Mn > Cr > Co

4) Mn > Cr > Fe > Co

6. 51. Cyclohexene on ozonolysis followed by reaction with Zn dust and water gives compound ‘E’. Compound ‘E’ on further treatment with aqu.KOH yields compound ‘F’. Compound ‘F’ is

7. What would be the product formed when 1-bromo-3 chloro cyclo butane reacts with two equivalents of metallic sodium in ether

8. In Na₂O having antifluorite structure

1) oxide ions have cubic closepacked arrangement and Na+
occupy all the octahedral voids.

2) oxide ions have cubic closepacked arrangement and Na+
occupyall the eight tetrahedral voids

3) Na+ ions have c.c.p arrangement and O2-
occupy all tetrahedral voids.

4) Na+ ions have c.c.p arrangementand O2- occupy all octahedral voids

9. A solution ‘X’ contains 30 mole percent of A and is in equilibrium with its vapour that contains 40 mole percent of ‘B’. The ratio of vapor pressure of pure A and B will be:

1) 2 : 1

2) 7 : 2

3) 3 : 4

4) 4 : 3

10. The standard reduction potential for Cu⁺²/ Cu  is +0.34V.Calculate the reduction potential at pH=14
for the above couple. ^K_s_pof Cu(OH)₂= 1.0×10^-19

1) +0.2205V

2) +0.386V

3) -0.2205V

4) -0.386V

11. Which plot is the adsorption isobar for chemisorption.

12. When the value of azimuthal quantum number is 3, the maximum and the minimum values of the spin multiplicities are

1) 4,3

2) 8,1

3) 1,3

4) 8,2

13. The weight of H₂O₂present in 80 ml of 10V H₂O₂ solution is

1) 3.2 gr

2) 4.2 gr

3) 2.4 gr

4) 3.6 gr

14. If mercury is used as cathode in the electrolysis of aqueous NaCl solution, the ions discharged at cathode are

1) H⁺

2) Na⁺

3) OH^-

4) Cl^-

15. For one mole of a vanderwaal’s gaswhen b=0 and T=300K, the PV vs1/V plot is shown below. The value of vander waal’s constant ‘a’ in atm.lit² mole^-2is (graph not to scale)

1) 1.0

2)4.5

3) 1.5

4) 3.0

16. The equivalent weight of HCl in the given reaction is
KCr₂O₇ +14 HCl -->2KCl + 2CrCl₃ +3Cl₂ +H₂O

1) 16.25

2) 36.5

3) 73

4) 85.1

17. At what temperature will average speed of the molecules of the second member of the series C_nH_2nbe the same of Cl₂ at 627⁰C?

1) 259.4K

2) 400K

3) 532.4K

4) 628K

18. When two moles of an ideal gas (C_pm=(5/2)R) heated from 300K to 600K at constant pressure. The change in entropy of gas (∆s ) is

1) (3/2)R ln2

2) (-3/2)R ln2

3) 5R ln2

4) (5/2)R ln2

19. I_2(aq)+ I^-(aq) --> I^-_3(aq)+We started with 1 mole of I^₂and 0.5 mole of I^- in one litre flask. After equilibrium is reached excess of AgNO₃ gave 0.25 mole of yellow precipitate. Then
Equilibrium constant is

1) 1.33

2) 2.66

3) 2.0

4) 3.0

20. The values of electro negativity of atoms A and B are 1.20 and 4.0 respectively. The percentage ionic character of A-B bond is

1) 50%

2) 72.24%

3) 55.3%

4) 43%

21. The plots of 1/ X_AVs 1/Y_A( where X_A and Y_Aare the mole fraction of liquid A in liquid and vapour phase respectively) is linear with slope and intercepts respectively

22. An oxide of Nitrogen which form reddish brown fumes in air is

1) N₂O

2) NO₂

3) NO

4) N₂O₃

23. Iron sulphide is heated in air to form ‘A’ . ‘A’ is dissolved in water to give ‘Y’. The basicity of ‘Y’ is

1) 1

2) 2

3) 0

4) 3

24. Which one of the following oxyacids of chlorine is the least
oxidising in nature

1) HOCl

2) HClO₂

3) HClO₄

4) HClO₃

25. Which of the following organ metallic compound is σ and π
bonded?

1) [ Fe(η⁵-C₂H5)₂]

2) [ PtCl3 (η2 -C2H₄ ) ]

3) [ Co(Co)5 NH₃ ]⁺²

4) All the above

26.

1) Glyptal

2) Dacron

3) Nylon-6,6

4) Nylon-6

27. An acid-base indicator has a In K_ln of 3 ×10^-5. The acid form of indicator is red and the basic form is blue.
Then

1) pH is 5.00 when indicator is 50%blue.

2) pH is 4.05 when indicator is 75%red.

3) pH is 5.00 when indicator is 75%red

4) pH is 4.05 when indicator is 75%blue.

28. Which of the following vitamin contains ionone ring and
hydrocarbon chain.

1) Calciferol

2) Thiamin

3) Retinol

4) Riboflavin

29. Which of the substances added to soap make it antiseptic?

1) Iodine

2) KMnO4

3) Bithional

4) Cl2

30. Which of the following ‘gem’ diols is stable?

31.

Incorrect statements about X and Y are

1) formation of Y is a syn addition

2)during the formation of X, the intermediate is a carbocation

3) X is a positional isomer of Y

4) formation of Y follows markonikov's rule

32. The correct order of increasing acidic strength of the compounds
A) CH₃CO₂H
B) MeOCH₂CO₂H
C) CF₃CO₂H

1) D < A < B < C

2) A < D < B < C

3) B < D < A < C

4) D < A < C < B

33.

The ratio of number of moles of Hydrogen atoms required to get 1 mole of azobenzene and 1 mole of hydrazobenzene is

1) 4 : 5

2) 5 : 4

3) 1 : 1

4) 2 : 3

34. A possitive carbylamine test is given by

1) N,N – dimethyl aniline

2) Isopropyl amine

3) diethyl amine

4) trimethyl amine

35. Which of the following amines form N-nitroso derivative when treated with NaNO₂and HCl

1) CH3NH2

2) C₆H₅ - NH₂

3) C₆H₅ - NH - R

36. Which of the following compound react faster through SN²mechanism

1) CH3- CH2Br

2) CH3- O - CH₂Br

3) C₆H5- CO - CH2Br

4) CH₃ - C (CH₃ )2- CH2Br

37. The most volatile alkane is

1) n – pentane

2) isopentane

3) neopentane

4) n–hexane

38. The hybridisation of Beryllium in Beryllate ion formed when Beryllium hydroxide dissolves in excess of alkali?

1) sp

2) sp_²

3) sp³

4) dsp²

39. The correct statement among the following is:
i) NaBH₄produce BH₆on reaction with I₂

ii) Reaction between B₂H₆and NMe₃is an acid base reaction

iii) BH₆is produced on industrial scale by reaction with BF₃, NaH

iv) Boranes on hydrolysis produce
B₂H₆and H₂gas

1) All are correct

2) Only i & ii are correct

3) Only iv is correct

4) Only i, ii, iii are correct

40. Incorrect statement among the following is

1) Pure CO is prepared bydehydration of formic acid with conc. H₂S4

2) Commercially CO is prepared byassing steam over red hot coke

3) CO is a powerful reducing agentand reduces almost all metal oxidesother than IA, IIA group elements,Al etc...

4) CO is a Lewis acid

41. Which of the following will have highest negative enthalpy of formation?

1) RbF

2) KF

3) CsF

4) NaF

42. Most basic and acidic oxides are formed by the following 3rd period elements.

1) Cs, Cl

2) Na, Cl

3) Na, F

4) Cs, S

43. The pair of molecules having same geometry and same bond angles are

1) NH₄+,PCl3

2) NH4+ , CH4

3) H2O , SO2

4) NH3 , PH3

44. Kjeldahl’s method cannot be used for estimation of nitrogen in
I) C₆H₅CO NH₂ II) Pyridine
III) C₆H₅-N=N-C₆H₅

1) I,III

2) II,III

3) III,IV

4) I,II

45. Benzene reacts with cholorine in the presence of U.V. light and gives

1) Chloro Benzene

2) 1, 2-dichloro Benzene

3) Hexachloro cyclohexane

4) Benzyl chloride

46. If lone pair of electron occupy axial position then, incorrect about is :

1) It is a planar molecule

2) It has T-shape

3) All bond lengths are equal

4) repulsion will be minimum

47. Which of the following is incorrect for the indicated property

1) Beo < Mgo (Basic strength)

2) SO2> SeO2> TeO2 (Acidic strength)

3) Nacl > KCl > RbCl > CsCl (Melting point)

4) BaSO4> SrSO4> CaSO4>MgSO4> BeSO4 (Solubility)

48. Select species which is planar at nitrogen

1) (CH3)3N

2) (SiH3)3N

3) XeF2

4) SF₄

49. Total number of coordination isomers shown by complex [Co(NH₃)₆] [Cr(Cl)₆] is:

1)4

2)5

3)6

4)0

50. Xe has max. EN in:-

1) XeF₂

2) XeF₄

3) XeO₄

4) XeOF₂

51. The correct statement/s about H₂ S₂ O₇ is/are

1) It is called peroxydisulphuric acid

2) It is contains one O-O bond in its molecule

3) It is obtained by dissolution of SO3 in conc. H₂ SO₄

4) Both (2) & (3)

52. Find correct statement

1) KMnO₄ is coloured due to d-d transition

2) K₄[Fe(CN)₆] is low spin complex

3) Zn and Cd are transition metal

4) All lanthanoids are radioactive

53. The first ionization potential of Na is 5.1eV The value of electron gain enthalpy of Na⁺ will be

1) -2.55eV

2) -5.1eV

3) -10.21eV

4) +2.55eV

54. Which one of the following is a mineral of iron?

1) Pyrolusite

2) Magnetite

3)Malachite

4) Cassiterite

55. In which of the following pairs, both the species are not isostructural?

1) NH₃ , PH₃

2) XeF₄ , XeO₄

3) SiCl₄ , PCl⁺₄

4) diamond, silicon carbide

56. Which property is common in diamond and graphite

1) Electrical conductivity

2) Crystal structure

3) Relative atomic mass

4) Density

57. When H₂S is passed through acidified KMnO₄ we get

1) K₂ SO₃

2) MnO₂

3) KHSO₃

4) Sulphur

58. The shortest wavelength of He⁺ ion in Balmer series is x, then longest wavelength in the paschen series of Li²⁺is

1) 36x/5

2) 16x/7

3) 9x/5

4) 5x/5

59. The molecule which is having maximum number of lone pair

1) SiF₄

2) BrF₃

3) XeF₂

4) SF₄

60. What will be the equivalent weight of H₃PO₃ in the following reaction. 4H₃PO₃ → 3H₃PO₄+PH₃

1) M/6

2) 2M/3

3) M/12

4) M/2

61. 20g of naphthoic acid (C₁₁H₈O₂) is dissolved in 50g of benzene, then freezing point depression of 2K is observed for solution. The vant hoff factor will be ( K_f for benzene=1.72 Kg Mol^-1)

1) 0.75

2) 2

3) 0.5

4) 3

62. Henderson equation pH - pKa = 5 will be applicable to an acidic buffer when:-

1) [ Acid ] = [conjugatebase]

2) [ Acid ] × 10⁵ = [conjugatebase]

3) [ Acid ] = [conjugatebase]× 10⁵

4) [ Acid ] = 2[conjugatebase]

63. The conductivity of saturated solution of BaSO₄is 3.06×10^-6 mho cm^-1and its equivalent conductance is 1.53 mho cm^-2 eq^-1. Then K_sp for BaSO₄ will be

1) 4×10^-12M

2) 1×10⁶M

3) 4×10⁶M²

4) 1×10^-6M²

64. Which artificial sweetner contains chlorine

1) Aspartame

2) Saccharin

3) Sucralose

4) Alitame

65. Which of the following has minimum flocculation value for positively charged sol ?

1) Cl^-

2) SO₄^2-

3) PO₄^3-

4) [Fe(CN)₆]^4-

66. The vapour pressure of a dilute solution of glucose is 750 mm of Hg at 373K. The mole fraction of solute is

1) 1/7.6

2) 1/76

3) 1/35

4) 1/10

67. For decolourization of one mole of KMnO₄ the required litre of 30 volume H₂O₂ in acidified medium is

1) 0.94

2) 9.4

3) 0.094

4) 3.01

68. 75% completion of a first order reaction takes 2.38 hours. How much time will it take for 99.9% completion?

1) 1.39 h

2) 7.14h

3) 11.9 h

4) 15.85 h

69. The number of carbon atoms per unitcell of diamond unitcell is

1) 8

2) 6

3) 1

4) 4

70. When 0.1mole MnO₄^2- is oxidized, the quantity of electricity required in coulombs to completely oxidize MnO₄^2- to MnO₄^- is

1) 96500

2) 2×96500

3)9650

4) 96.50

71. The half life of a reaction is 46 minutes when the initial concentration of the reactant is 4 mol/L and 92 minutes when the initial concentration is 0.2mol/L. The order of the reaction is

1) Zero

2) 0.5

3) 2

4) 1

72. Equimolar solutions of the following were prepared in water separately. Which one of the solution will record the highest p^H?

1) BaCl2

2) MgCl2

3) CaCl2

4) SrCl2

73.

Number of carbon atoms in principal carbon chain

1) 7

2) 4

3)6

4)5

74. Find the correct order of acidity of the following compounds

1) III> II> I> IV

2) III> I> II> IV

3)III> II> IV> I

4) IV> I> II> III

75. Which of the following C – H bond has the least bond dissociation energy

76. Compound having least heat of hydrogenation:

77.

78. Number of stereoisomers of the given compound

1) 2

2)3

3)4

4)6

79. To form osazone, mumber of moles of phenyl hydrazine required by one mole of glucose is

1) 4

2) 3

3) 2

4) 1

80. DNA & RNA are chiral molecules due to the presence of

1) Chiral bases

2) Phosphate ester unit

3) D- sugar component

4) L – sugar component

81. Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom?

1) 127 pm

2) 157 pm

3) 181 pm

4) 108 pm

82. Method which is based on difference in solubility of impurities in molted metal and solid state
of metal is

1) Parke’s process

2) bessemerisation

3) zone refining

4) electrolytic refining

83. Addition of dilute HCl or FeCl₃solution to freshly precipitated ferric hydroxide, a red coloured colloidal solution is obtained. The phenomenon is known as

1) peptisation

2) dialysis

3) osmosis

4) coagulation

84. At Boyles temperature, compressibility factor Z for a real gas is

1) Z = 1

2) Z = 0

3) Z > 1

4) Z >> 1

85. The impure 7g of NaCl is dissolved in water and then treated with excess of silver nitrate solution. The weight of precipitate of silver chloride is found to be 14g. The % purity of NaCl solution would be (M. Wt of AgCl = 143.5, NaCl = 58.5)

1) 81.5%

2) 63%

3) 93%

4) 77%

86. V1 ml of 3M HCl solution is mixed with V₂ml of 3M H₂SO₄to from a solution in which molarity of H+ ions is 5M, then the relation between V₁and V₂is

1) V₁= V₂

2) V₂=2V₁

3) 3V₁= V₂

4) 2V₂= V₁

87. Assertion: Graphite is thermodynamically most stable allotrope of carbon
Reason: ΔH_f⁰ of graphite is taken as zero

1) Both assertion and reason are correct, reason is the correct explanation of the assertion.

2) Both assertion and reason are correct reason is the not correct explanation of the assertion.

3) Assertion is correct, reason is incorrect.

4) Assertion is incorrect, reason is correct.

88. Aqueous solutions of two compounds M-O-H and M¹-O-H have been prepared in two different
beakers. If the electronegativity of M=3.5, M¹=0.9, O=3.5 and H=2.1, then the solutions respectively are

1) acidic, acidic

2) acidic, basic

3) basic, basic

4) basic, acidic

89. The pH of a solution of H₂O₂is 6.0. Some chlorine gas is bubbled into this solution. Which of
the following is correct?

1) The pH of resultant solution becomes 8.0

2) Hydrogen gas is liberated from resultant solution

3) The pH of resultant solution becomes less than 6.0 and oxygen gas is liberated

4) Cl₂O is formed in the resultant solution

90. The pH of a solution of H₂O₂is 6.0. Some chlorine gas is bubbled into this solution. Which of
the following is correct?

1) The pH of resultant solution becomes 8.0

2) Hydrogen gas is liberated from resultant solution

3) The pH of resultant solution becomes less than 6.0 and oxygen gas is liberated

4) Cl₂O is formed in the resultant solution

91. A and B are compounds of sodium. ‘A’ is thermally stable. On passing CO₂through aq. solution
‘A’, ‘B’ is formed. ‘B’ on heating gives ‘A’. Phenolpthalein is added to aqueous solutions of A, B.
The colours are

1) colourless, colourless

2) pink, pink

3) colourless, pink

4) pink, colourless

92. Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in

1) exhibiting amphoteric nature in their oxides

2) forming polymeric hydrides

3) forming covalent halides

4)exhibiting same covalency incompounds

93. 100ml of O ₂on partial ozonisation, O₂and O₃are obtained in the molar ratio of 1 : 1 what % of O₂is converted into ozone

1) 60%

2) 50%

3) 40%

4) 57%

94. Which of the following is not correctly matched?

1) Teflon –Additional polymer

2) Gun cotton –synthetic polymer

3) Protein – natural polymer

4) Nylon-6, 6 – condensation polymer

95. In Kjeldahl ‘s method, the nitrogen gas evolved from 1.325 g sample of a fertilizer is passed into 50.0 mL of 0.2030 N H₂SO₄mL of 0.1980 N NaOH are required for the titration of unused acid. The percentage of nitrogen in fertilizer is

1) 10.86%

2) 21.72 %

3) 5.43 %

4) 2.75 %

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