### JEE Main 2019 Question Paper All Questions

Chemistry
1. The upper stratosphere consisting of the ozone layer protects us from the sun's radiation that falls in the wavelength region of :

 a) 600 - 750 nm b) 400 - 550 nm c) 0.8 - 1.5 nm d) 200 - 315 nm
Chemistry - Biological , Industrial and Environmental chemistry Environmental Chemistry
Marked right : 5.013871306596278% students | Marked incorrect : 12.923209524066042% students | Marked not attempted : 82.06291916933768% students

Correct Option: d

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2. The pair that does NOT require calcination is :

 a) b) c) d)
Chemistry - General Principle and process of Isolation of metals General Principles and processes of Isolation Elements
Marked right : 8.962428598246133% students | Marked incorrect : 8.625868218509481% students | Marked not attempted : 82.41170318324438% students

Correct Option: b

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3. The compound that is NOT a common component of photochemiclal smog is :

 a) b) c) d)
Chemistry - Biological , Industrial and Environmental chemistry Environmental Chemistry
Marked right : 6.272819131020546% students | Marked incorrect : 10.547659144493094% students | Marked not attempted : 83.17952172448636% students

Correct Option: c

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4. The aldehydes which will NOT form Grignard product with one equivalent Grignard reagents are :

 a) (B), (D) b) (B), (C),(D) c) (B), (C) d) (C), (D)
Chemistry - Organic Compounds containing Oxygen
Marked right : 1.9623138895240144% students | Marked incorrect : 9.02879584672701% students | Marked not attempted : 89.00889026374898% students

Correct Option: d

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5. The major product of the following reaction is :

 a) b) c) d)
Chemistry - Principles of Organic Chemistry and Hydrocarbons Hydrocarbons Hydrocarbons
Marked right : 4.843392929157145% students | Marked incorrect : 7.449926065331362% students | Marked not attempted : 87.70668100551148% students

Correct Option: c

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6. The major product of the following reaction is :

 a) b) c) d)
Chemistry - Hydrocarbons
Marked right : 28.731942215088285% students | Marked incorrect : 25.52166934189406% students | Marked not attempted : 45.74638844301766% students

Correct Option: b

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7. The volume of gas A is twice than that of gas B. The compressibility factor of gas A is thrice than that of gas B at same temperature. The pressures of the gases for equal number of moles are :

 a) b) c) d)
Chemistry - States of Matter States of matter States of Matter : Gases and liquids
Marked right : 33.5978835978836% students | Marked incorrect : 12.962962962962962% students | Marked not attempted : 53.43915343915344% students

Correct Option: a

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8. Two solids dissociate as follows

The total pressure when both the solids dissociate simultaneously is :

 a) (x + y) atm b) c) d)
Chemistry - Physical and Chemical Equilibria Equilibrium Equilibrium
Marked right : 14.775725593667547% students | Marked incorrect : 16.886543535620053% students | Marked not attempted : 68.33773087071239% students

Correct Option: d

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9. Among the following four aromatic compounds, which one will have the lowest melting point ?

 a) b) c) d)
Chemistry - Organic Compounds containing Oxygen
Marked right : 31.666666666666664% students | Marked incorrect : 17.59259259259259% students | Marked not attempted : 50.74074074074074% students

Correct Option: d

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10. The standard electrode potential  and its temperature coefficient  for a cell are 2 V and  at 300K respectively. The cell reaction is

The standard reaction enthalpy at 300 K in kJ mol -1 is ,

 a) -412.8 b) -384 c) 192 d) 206.4
Chemistry - Electrochemistry Redox Reaction and Electrochemistry Electrochemistry
Marked right : 6.05427974947808% students | Marked incorrect : 9.812108559498958% students | Marked not attempted : 84.13361169102296% students

Correct Option: a

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11. The combination of plots which does not represent isothermal expansion of an ideal gas is :

 a) (A) and (D) b) (A) and (C) c) (B) and (D) d) (B) and (C)
Chemistry - Chemical Thermodynamics Thermodynamics
Marked right : 26.550868486352357% students | Marked incorrect : 16.87344913151365% students | Marked not attempted : 56.575682382134% students

Correct Option: c

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12. What is the work function (in eV) of the metal if the light of wavelength generates photoelectrons of velocity from it ?

(Mass of electron =

Velocity of light =

Planck's constant =

Charge of electron = )

 a) 0.9 b) 3.1 c) 2.1 d) 4
Chemistry - Atomic Structure Structure of Atom Atomic Structure
Marked right : 11.570247933884298% students | Marked incorrect : 11.983471074380166% students | Marked not attempted : 76.44628099173553% students

Correct Option: c

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13. Arrange thefollowing amines in the decreasing order of basicity:

 a) b) c) d)
Chemistry - Organic Compounds with Functional Groups Containing Oxygen and Nitrogen Organic Compounds Containing Nitrogen Organic Compounds Containing Nitrogen
Marked right : 21.57772621809745% students | Marked incorrect : 26.218097447795824% students | Marked not attempted : 52.204176334106734% students

Correct Option: b

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14. The incresing order of of the following amino acids in aqueous solution is:

 a) b) c) d)
Chemistry - Organic Compounds with Functional Groups Containing Oxygen and Nitrogen Organic Compounds Containing Nitrogen Biomolecules Organic Compounds Containing Nitrogen Biomolecules
Marked right : 18.80674448767834% students | Marked incorrect : 15.953307392996107% students | Marked not attempted : 65.23994811932555% students

Correct Option: c

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15. If dichloromethane (DCM) and water  are used for differential extraction , which one of the following statements is correct?

 a) would stay as lower and upper layer respectively in the S.F. b) will make turbid / colloidal mixture . c) would stay as upper and lower layer respectively in the separating funnel (S.F.) d) will be miscible clearly
Chemistry - Purification and Characterisation of Organic Compounds Organic Chemistry - some Basic principles and techniques
Marked right : 14.659685863874344% students | Marked incorrect : 15.18324607329843% students | Marked not attempted : 70.15706806282722% students

Correct Option: a

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16. Consider the given plots for a reaction obeying Arrhenius equation ( ) : (k and are rate constant and activation energy , respectively )

 a) I is right but II is wrong . b) Both I and II are correct. c) I is wrong but II is right . d) Both I and II are wrong
Chemistry - Chemical Kinetics and Surface Chemistry Chemical kinetics Chemical kinetics
Marked right : 25.77777777777778% students | Marked incorrect : 16.666666666666664% students | Marked not attempted : 57.55555555555556% students

Correct Option: b

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17. The major product of the following reaction is:

 a) b) c) d)
Chemistry - Organic Compounds containing Halogens Haloalkanes and Haloarenes
Marked right : 13.91304347826087% students | Marked incorrect : 24.869565217391305% students | Marked not attempted : 61.21739130434782% students

Correct Option: a

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18. The entropy change (in kJK-1kg-1) associated with the conversion of 1kg of ice at 273 K to water vapours at 383 K is:

( Specific heat of water liquid and water vapour are  ; heat of liquid fusion and vapourisation of water are  , respectively ). ( log 273 = 2.436 , log 373=2.572 , log 383 = 2.583)

 a) 2.64 b) 7.9 c) 8.49 d) 9.26
Chemistry - Chemical Thermodynamics Thermodynamics
Marked right : 5.807622504537205% students | Marked incorrect : 6.715063520871143% students | Marked not attempted : 87.47731397459165% students

Correct Option: d

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19. Consider the following reversible chemical reactions :

$\mathrm{A_{2}(g)+B_{2}(g) \stackrel{K_{1}}{\rightleftharpoons} 2 A B(g)}$

$\mathrm{6 A B(g) \stackrel{K_{2}}{\rightleftharpoons} 3 A_{2}(g)+3 B_{2}(g)}$

The relation between $\mathrm{K_{1}\: and\: K_{2}}$  is :

 a) $\mathrm{K_{1}K_{2}=\frac{1}{3}}$ b) $\mathrm{K_{2}=K_{1}\: ^{3}}$ c) $\mathrm{K_{1}K_{2}=3}$ d) $\mathrm{K_{2}=K_{1}\: ^{-3}}$
Chemistry - Equilibrium
Marked right : 29.512893982808023% students | Marked incorrect : 12.034383954154727% students | Marked not attempted : 58.45272206303726% students

Correct Option: d

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20. The major product of the following reaction is :

 a) b) c) d)
Chemistry - Organic Compounds containing Oxygen
Marked right : 6.702412868632708% students | Marked incorrect : 14.745308310991955% students | Marked not attempted : 78.55227882037534% students

Correct Option: c

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21. 25 ml of the given HCl solution requires 30 mL of 0.1 M sodium carbonate solution. What is the volume (in ml) of this HCl solution required to titrate 30 mL of 0.2 M aqueous NaOH solution?

(Response should be in integer only like 78 or 6).

 a) 25 b) 75 c) 12.5 d) 50
Chemistry - Some basic concepts in chemistry
Marked right : 11.98443579766537% students | Marked incorrect : 10.27237354085603% students | Marked not attempted : 77.74319066147861% students