JEE Main 2019 Question Paper

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JEE Main 2019 Question Paper All Questions

Chemistry
1. The total number of isomers for a square planar complex   is :

 a) 16 b) 8 c) 4 d) 12
Chemistry - Co-ordination Compounds Coordination compounds:
Marked right : 18.670886075949365% students | Marked incorrect : 26.89873417721519% students | Marked not attempted : 54.43037974683544% students

Correct Option: d

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2. A process has  $\mathrm{\Delta H=200\: Jmol^{-1}\: \: }$ and $\mathrm{ \Delta S=40\: JK^{-1}mol^{-1}}$. Out  of the values given below, choose the minimum temperature (in K) above which the process will be spontaneous :

 a) 20 b) 12 c) 5 d) 4
Chemistry - Chemical Thermodynamics
Marked right : 25.563909774436087% students | Marked incorrect : 7.894736842105263% students | Marked not attempted : 66.54135338345864% students

Correct Option: c

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3. The value of $\mathrm{K_{P}/K_{C}}$   for the following reactions at 300 K are respectively : (At 300 K , RT = 24.62 $\mathrm{dm^{3}atm \: mol^{-1}}$)

$\mathrm{N_{2}(g)+ O_{2}(g)\rightleftharpoons 2NO(g)}$

$\mathrm{N_{2}O_{4}(g)\rightleftharpoons 2NO_{2}(g)}$

$\mathrm{N_{2}(g)+3H_{2}(g)\rightleftharpoons 2NH_{3}(g)}$

 a) $\mathrm{1,24.62 d m^{3} \text { atm } mol ^{-1}, 606.0 dm ^{6} \text { atm }^{2} mol ^{-2}}$ b) $\mathrm{1,24.62 d m^{3} \text { atm } mol ^{-1}, 1.65 \times 10^{-3} dm ^{-6} atm ^{-2} mol ^{-1}}$ c) $\mathrm{1,4.1\times 10^{-2}dm^{-3}atm^{-1} \: mol, 606dm^{6}atm^{2}mol^{-2}}$ d) $\mathrm{24.62dm^{3}atm\: mol^{-1},606.0 dm^{6}atm^{2}mol^{-2}, 1.65\times 10^{-3}dm^{-6}atm^{-2}mol^{2}}$
Chemistry - Equilibrium
Marked right : 33.53909465020576% students | Marked incorrect : 9.876543209876543% students | Marked not attempted : 56.5843621399177% students

Correct Option: b

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4. The total number of isotopes of hydrogen and number of radioactive isotopes among them , respectively , are :

 a) 3 and 1 b) 3 and 2 c) 2 and 1 d) 2 and 0
Chemistry - Hydrogen
Marked right : 56.030534351145036% students | Marked incorrect : 7.938931297709924% students | Marked not attempted : 36.030534351145036% students

Correct Option: a

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5. Water filled in two glasses A and B have BOD values of 10 and 20, respectively. The correct statement regarding them is:

 a) B is more polluted than A . b) A is suitable for drinking, whereas B is not . c) Both A and B are suitable for drinking . d) A is more polluted than B.
Chemistry - Biological , Industrial and Environmental chemistry Environmental Chemistry Environmental Chemistry Environmental Chemistry
Marked right : 17.24234372814991% students | Marked incorrect : 9.523143616277444% students | Marked not attempted : 73.23451265557264% students

Correct Option: a

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6. Which premitive unit cell has unequal edge lengths  and all axial angles different from ?

 a) Triclinic b) Hexagonal c) Monoclinic d) Tetragonal
Chemistry - States of Matter States of matter Solid state
Marked right : 39.76190476190476% students | Marked incorrect : 9.523809523809524% students | Marked not attempted : 50.71428571428571% students

Correct Option: a

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7. The major product of the following reaction is:

 a) b) c) d)
Chemistry - Organic Compounds containing Halogens Haloalkanes and Haloarenes
Marked right : 13.805970149253731% students | Marked incorrect : 25.37313432835821% students | Marked not attempted : 60.820895522388064% students

Correct Option: a

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8. 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 : 25.829383886255926% students | Marked incorrect : 16.587677725118482% students | Marked not attempted : 57.58293838862559% students

Correct Option: b

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9. The major product formed in the reaction given below will be:

 a) b) c) d)
Chemistry - Organic Compounds with Functional Groups Containing Oxygen and Nitrogen Organic Compounds Containing Nitrogen Organic Compounds Containing Nitrogen
Marked right : 0% students | Marked incorrect : 42.21635883905013% students | Marked not attempted : 57.78364116094987% students

Correct Option:

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10. Wilkinson catalyst is :

 a) b) c) d)
Chemistry - Chemical Kinetics and Surface Chemistry Surface Chemistry Surface Chemistry
Marked right : 32.25806451612903% students | Marked incorrect : 8.064516129032258% students | Marked not attempted : 59.67741935483871% students

Correct Option: c

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11. 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 : 13.91304347826087% students | Marked incorrect : 15.36231884057971% students | Marked not attempted : 70.72463768115942% students

Correct Option: a

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12. Which dicarboxylic acid in presence of a dehydrating agent is least reactive to give an anhydride ?

 a) b) c) d)
Chemistry - Organic Compounds with Functional Groups Containing Oxygen and Nitrogen Organic Compounds containing Oxygen Aldehydes, Ketones and Carboxylic Acids
Marked right : 18.766756032171582% students | Marked incorrect : 19.302949061662197% students | Marked not attempted : 61.93029490616622% students

Correct Option: a

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13. The decreasing order of ease of alkaline hydrolysis for the following esters is

 a) b) c) d)
Chemistry - Organic Compounds with Functional Groups Containing Oxygen and Nitrogen Organic Compounds containing Oxygen Aldehydes, Ketones and Carboxylic Acids
Marked right : 28.07017543859649% students | Marked incorrect : 12.865497076023392% students | Marked not attempted : 59.06432748538012% students

Correct Option: b

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14. Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface ?

 a) b) c) d)
Chemistry - Atomic Structure
Marked right : 23.309608540925268% students | Marked incorrect : 25.97864768683274% students | Marked not attempted : 50.71174377224199% students

Correct Option: c

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15. Which of the following is not an example of heterogeneous catalytic reaction ?

 a) Ostwald's process b) Combustion of coal c) Hydrogenatoin of vegetable oils d) Haber's process
Chemistry - Chemical Kinetics and Surface Chemistry Surface Chemistry Surface Chemistry
Marked right : 30.020703933747413% students | Marked incorrect : 21.73913043478261% students | Marked not attempted : 48.24016563146998% students

Correct Option: b

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16. The effect of lanthanoid contraction in the lanthanoid series of the element by and large means?

 a) Increase in both atomic and ionic radii. b) Decrease in atomic radii and increase in ionic radii. c) Decrease in both atomic and ionic radii. d) Increase in atomic radii and decrease in ionic radii.
Chemistry - p- d- and f-block elements d - and f - BLOCK ELEMENTS d and f Block Elements
Marked right : 42.255892255892256% students | Marked incorrect : 19.696969696969695% students | Marked not attempted : 38.04713804713805% students

Correct Option: c

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17. Which hydrogen in compound (E) is easily replaceable during bromination reaction in presence of light ?

(E)

 a) b) c) d)
Chemistry - Organic Compounds containing Halogens Haloalkanes and Haloarenes
Marked right : 20.42833607907743% students | Marked incorrect : 28.00658978583196% students | Marked not attempted : 51.565074135090605% students

Correct Option: b

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18.

The major product of the following reaction is:

 a) b) c) d)
Chemistry - Organic Compounds containing Halogens Haloalkanes and Haloarenes
Marked right : 11.342155009451796% students | Marked incorrect : 18.336483931947072% students | Marked not attempted : 70.32136105860114% students