# 12th April Slot 2

### JEE Main 2019 Question Paper All Questions

Chemistry
1. Thermal decomposition of an Mn compound (X) at 513 results in a compound Y,  and a gaseous product.  reacts with NaCI and concentrated  to give a pungent gas Z. X, Y, and Z, respectively, are:

 a) and b) and c) and d) and
Chemistry - p- d- and f-block elements d - and f - BLOCK ELEMENTS d and f Block Elements
Marked right : 15.29745042492918% students | Marked incorrect : 20.396600566572236% students | Marked not attempted : 64.30594900849859% students

Correct Option: c

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2. $NO_{2}$ required for a reaction is produced by the decomposition of $N_{2}O_{5}$ in $CCl_{4}$ as per the equation, $2N_{2}O_{5}(g)\rightarrow 4NO_{2}(g)+O_{2}(g)$.

The initial concentration of $N_{2}O_{5}$ is $3.00 mol L^{-1}$ and it is $2.75 mol L^{-1}$ after 30 minutes. The rate of formation of $NO_{2}$ is:

(in $molL^{-1}min^{-1}$)

 a) 0.01667 b) 0.004167 c) 0.008333 d) 0.002083
Chemistry - Chemical kinetics
Marked right : 6.741573033707865% students | Marked incorrect : 27.752808988764045% students | Marked not attempted : 65.50561797752809% students

Correct Option: a

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3. The pair that has similar atomic radii is:

 a) Mn and Re b) Ti and Hf c) Sc and Ni d) Mo and W
Chemistry - Classification of elements and periodicity in properties Classification of Elements and Periodic table
Marked right : 34.9911190053286% students | Marked incorrect : 25.932504440497333% students | Marked not attempted : 39.07637655417407% students

Correct Option: d

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4. The INCORRECT statement is:

 a) Lithium is the strongest reducing agent among the alkali metals. b) Lithium is least reactive with water among the alkali metals c) decomposes on heating to give  and d) crystallizes from aqueous solution as
Chemistry - Hydrogen and s-block Elements S - Block Elements (Alkali and Alkaline Earth Metals) s- Block Elements ( Alkali and Alkaline earth metals )
Marked right : 35.324675324675326% students | Marked incorrect : 15.064935064935064% students | Marked not attempted : 49.61038961038961% students

Correct Option: c

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5. The C - C bond length is maximum in:

 a) graphite b) c) d) diamond
Chemistry - p- d- and f-block elements P-block elements p- Block Elements Some p-Block elements
Marked right : 5.924978687127025% students | Marked incorrect : 5.441886899687411% students | Marked not attempted : 88.63313441318556% students

Correct Option: d

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6. A solution is prepared by dissolving 0.6 g of urea (molar mass = 60g $mol^{-1}$ ) and 1.8 g of glucose (molar mass = 180 g $mol^{-1}$ ) in 100 mL of water at $27^{\circ}C$. The osmotic pressure of the solution is (in atm):

(R = 0.08206 L atm $K^{-1}mol^{-1})$

(Response should be upto only two decimal digit like 78.76 or 0.78).

 a) 4.92 b) 2.46 c) 5.8 d) 1.64
Chemistry - Solutions
Marked right : 23.492723492723496% students | Marked incorrect : 9.355509355509357% students | Marked not attempted : 67.15176715176715% students

Correct Option: a

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7. In comparison to boron, beryllium has:

 a) lesser nuclear charge and lesser first ionisation enthalpy b) greater nuclear charge and lesser first ionisation enthalpy c) greater nuclear charge and greater first ionisation enthalpy d) lesser nuclear charge and greater first ionisation enthalpy
Chemistry - Classification of Elements and Periodic table
Marked right : 30.727272727272727% students | Marked incorrect : 28.545454545454547% students | Marked not attempted : 40.72727272727273% students

Correct Option: d

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8. The decreasing order of electrical conductivity of the following aqueous solution is:

0.1 M Formic acid (A),

0.1 M Acetic acid (B),

0.1 M Benzoic acid (C)

 a) A > C > B b) C > B > A c) A > B > C d) C > A > B
Chemistry - Carboxylic Acids and their derivatives Organic compounds containing C, H AND O (Alcohols, Phenols, Ethers, Aldehydes, Ketones and Carboxylic acids) Organic Compounds containing Oxygen
Marked right : 7.7167171498629745% students | Marked incorrect : 21.419299004759846% students | Marked not attempted : 70.86398384537718% students

Correct Option: a

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9. What will be the major product when m-cresol is reacted with propargyl bromide  in the presence of  in acetone?

 a) b) c) d)
Chemistry - Organic Compounds with Functional Groups Containing Oxygen and Nitrogen Organic compounds containing C, H AND O (Alcohols, Phenols, Ethers, Aldehydes, Ketones and Carboxylic acids) Organic Compounds containing Oxygen Aldehydes, Ketones and Carboxylic Acids
Marked right : 6.163144180660105% students | Marked incorrect : 21.89128546612623% students | Marked not attempted : 71.94557035321367% students

Correct Option: a

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10. The molar solubility of  is  in water. The expected solubility of  in a buffer solution of pH = 12 is :

 a) b) c) d)
Chemistry - Solutions Solutions
Marked right : 18.207282913165265% students | Marked incorrect : 7.002801120448179% students | Marked not attempted : 74.78991596638656% students

Correct Option: d

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11. Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives:

 a) b) c) d)
Chemistry - Organic Compounds with Functional Groups Containing Oxygen and Nitrogen Organic Compounds Containing Nitrogen Organic Compounds Containing Nitrogen
Marked right : 14.688772542175684% students | Marked incorrect : 8.071553228621292% students | Marked not attempted : 77.23967422920303% students

Correct Option: c

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12. The correct statement is:

 a) leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate. b) the Hall-Heroult process is used for the production of aluminum and iron c) pig iron obtained from cast iron d) the blistered appearance of copper during the metallurgical process is due to the evaluation of
Chemistry - Purification and Characterisation of Organic Compounds Organic Chemistry - some Basic principles and techniques
Marked right : 21.910112359550563% students | Marked incorrect : 23.03370786516854% students | Marked not attempted : 55.0561797752809% students

Correct Option: a

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13. The primary pollutant that leads to photochemical; smog is:

 a) acrolein b) nitrogen oxides c) ozone d) sulphur dioxide
Chemistry - Biological , Industrial and Environmental chemistry Environmental Chemistry Environmental Chemistry
Marked right : 45.915841584158414% students | Marked incorrect : 21.534653465346533% students | Marked not attempted : 32.54950495049505% students

Correct Option: b

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14. The IUPAC name for the following compounds is:

 a) 3-methyl-4-(3-methylprop-1-enyl)-1-heptyne b) 3,5-dimethyl-4-propylhept-6-en-1-yne c) 3-methyl-4-(1-methylprop-2-ynyl)-1-heptene d) 3,5-dimethyl-4-propylhept-1-en-6-yen
Chemistry - Principles of Organic Chemistry and Hydrocarbons Some Basic Principles of Organic Chemistry Organic Chemistry - some Basic principles and techniques
Marked right : 19.346049046321525% students | Marked incorrect : 28.065395095367844% students | Marked not attempted : 52.58855585831063% students

Correct Option: d

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15. The temporary hardness of a water sample is due to compound X. Boiling this sample converts X to compound Y. X and Y, respectively, are:

 a) and b) and c) and d) and CaO
Chemistry - Hydrogen and s-block Elements Hydrogen Hydrogen
Marked right : 24.057450628366247% students | Marked incorrect : 28.366247755834827% students | Marked not attempted : 47.57630161579892% students

Correct Option: a

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16. In the following skew conformation of ethane, ${H}' - C - C - H''$ dihedral angle is:

 a) b) c) d)
Chemistry - Some Basic Principles of Organic Chemistry
Marked right : 22.3463687150838% students | Marked incorrect : 18.24953445065177% students | Marked not attempted : 59.40409683426443% students

Correct Option: b

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17. Among the following, the energy of 2s orbital is lowest in:

 a) K b) H c) Li d) Na
Chemistry - Atomic Structure Atomic Structure
Marked right : 24.35129740518962% students | Marked incorrect : 33.532934131736525% students | Marked not attempted : 42.115768463073856% students

Correct Option: a

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18. Which one of the following is likely to give a precipitate with  solution?

 a) b) c) d)
Chemistry - Organic Compounds containing Halogens Haloalkanes and Haloarenes
Marked right : 25.32347504621072% students | Marked incorrect : 16.081330868761555% students | Marked not attempted : 58.59519408502772% students

Correct Option: d

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19. 25g of an unknown hydrocarbon upon burning produces 88 g of  and 9 g of . This unknown hydrocarbon contains:

 a) 20 g of carbon and 5 g of hydrogen b) 22 g of carbon and 3 g of hydrogen c) 24 g of carbon and 1 g of hydrogen d) 18 g of carbon and 7 g of hydrogen
Chemistry - Some basic concepts in chemistry
Marked right : 15.017757483510907% students | Marked incorrect : 9.081684424150177% students | Marked not attempted : 75.90055809233891% students

Correct Option: c

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20. Heating of 2-chloro-1-phenylbutane with EtOK/EtOH gives X as the major product. The reaction of X with  followed by  gives Y as the major product. Y is:

 a) b) c) d)
Chemistry - Organic Compounds containing Halogens Haloalkanes and Haloarenes
Marked right : 21.062271062271062% students | Marked incorrect : 14.102564102564102% students | Marked not attempted : 64.83516483516483% students

Correct Option: c

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21. The compound used in the treatment of lead poisoning is:

 a) D-penicillamine b) desferrioxime B c) Cis-plantin d) EDTA
Chemistry - Chemistry in Everyday Life Chemistry in Everyday Life
Marked right : 13.607863074055246% students | Marked incorrect : 15.861718352821555% students | Marked not attempted : 70.5304185731232% students

Correct Option: d

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22. Which of the given statement is INCORRECT about glycogen?

 a) It is a straight chain polymer similar to amylose. b) Only  are present in the molecule c) It is present in animal cells d) It is present in some yeast and fungi.
Chemistry - Biomolecules Biomolecules
Marked right : 6.460674157303371% students | Marked incorrect : 10.182584269662922% students | Marked not attempted : 83.35674157303372% students

Correct Option: a

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23. Consider the following reactions:

'A' is :

 a) b) c) d)
Chemistry - Principles of Organic Chemistry and Hydrocarbons Hydrocarbons Hydrocarbons
Marked right : 23.933209647495364% students | Marked incorrect : 21.521335807050093% students | Marked not attempted : 54.54545454545454% students

Correct Option: c

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24. The correct of the following polymer is :

 a) Polyisobutane b) Polytert - butylene c) Polysioprene d) Polyisobutylene
Chemistry - Polymers Polymers
Marked right : 30.88235294117647% students | Marked incorrect : 24.63235294117647% students | Marked not attempted : 44.48529411764706% students

Correct Option: d

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25. An 'Assertion' and a 'Reason' are given below. Choose the correct answer from the following options:

Assertion (A): Vinyl halides do not undergo nucleophilic substitution easily.

Reason (R): Even though the intermediate carbocation is stabilized by loosely held electrons, the cleavage is difficult because of strong bonding.

 a) Both (A) and (R) are wrong statements b) Both (A) and (R) are the correct statement and (R) is the correct explanation of (A). c) Both (A) and (R) are correct statements but (R) isnot the correct explanation of (A). d) (A) is a correct statement but (R) wrong statement.
Chemistry - Organic Compounds containing Halogens Haloalkanes and Haloarenes
Marked right : 14.12639405204461% students | Marked incorrect : 20.44609665427509% students | Marked not attempted : 65.4275092936803% students

Correct Option: d

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26. The ratio of a number of atoms present in a simple cubic, body-centered cubic and face-centered cubic structure are, respectively:

 a) 8 : 1 : 6 b) 1 : 2 : 4 c) 4 : 2 : 1 d) 4 : 2 : 3
Chemistry - States of Matter States of matter Solid state
Marked right : 42.56410256410256% students | Marked incorrect : 4.358974358974359% students | Marked not attempted : 53.07692307692308% students

Correct Option: b

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27. In which one of the following equilibria,

$\mathrm{K_{p}\neq K_{c}?}$

 a) $\mathrm{2 C(s)+O_{2}(g) \rightleftharpoons 2 C O(g)}$ b) $\mathrm{2 H I(g) \rightleftharpoons H_{2}(g)+I_{2}(g)}$ c) $\mathrm{N O_{2}(g)+S O_{2}(g) \rightleftharpoons N O(g)+S O_{3}(g)}$ d) $\mathrm{2 N O(g) \rightleftharpoons N_{2}(g)+O_{2}(g)}$
Chemistry - Equilibrium
Marked right : 32.544378698224854% students | Marked incorrect : 11.834319526627219% students | Marked not attempted : 55.62130177514793% students

Correct Option: a

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28. The coordination numbers of Co and Al in  and , respectively, are :

(en = ethane-1, 2-diamine)

 a) 5 and 3 b) 3 and 3 c) 6 and 6 d) 5 and 6
Chemistry - Co-ordination Compounds Coordination compounds:
Marked right : 30.56379821958457% students | Marked incorrect : 17.210682492581604% students | Marked not attempted : 52.22551928783383% students

Correct Option: d

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29. The INCORRECT match in the following is:

 a) b) c) d)
Chemistry - Physical and Chemical Equilibria Equilibrium Equilibrium
Marked right : 18.73198847262248% students | Marked incorrect : 24.495677233429394% students | Marked not attempted : 56.77233429394812% students

Correct Option: d

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30. Among the following, the INCORRECT statement about colloids is:

 a) They can scatter light. b) They are larger than small molecules and have high molar mass. c) The osmotic pressure of a colloidal solution is of a higher order than the true solution at the same concentration. d) The range of diameters of colloidal particles is between 1 and 1000 nm.
Chemistry - Surface Chemistry
Marked right : 33.81294964028777% students | Marked incorrect : 15.827338129496402% students | Marked not attempted : 50.35971223021583% students

Correct Option: c

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31. Maths
32. The derivative of ,

with respect to , where  is :

 a) 1 b) c) d) 2
Maths - Trigonometry Differential Calculus Trigonometry Limit , continuity and differentiability
Marked right : 15.868263473053892% students | Marked incorrect : 14.67065868263473% students | Marked not attempted : 69.46107784431138% students