# 12th April Slot 1

None

### JEE Main 2019 Question Paper All Questions

Chemistry
1. The correct sequence of thermal stability of the following carbonates is:

 a) b) c) d)
Chemistry - Hydrogen and s-block Elements S - Block Elements (Alkali and Alkaline Earth Metals) s- Block Elements ( Alkali and Alkaline earth metals )
Marked right : 32.581453634085214% students | Marked incorrect : 16.040100250626566% students | Marked not attempted : 51.37844611528822% students

Correct Option: a

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2. The correct statement among the following is :

 a) is pyramidal and less basic than . b) is planar and less basic than  . c) is planar and more basic than . d) is pyramidal and more basic than .
Chemistry - p- d- and f-block elements p- Block Elements Some p-Block elements
Marked right : 16.27906976744186% students | Marked incorrect : 17.732558139534884% students | Marked not attempted : 65.98837209302324% students

Correct Option: b

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3. The electrons are more likely to be found:

 a) in the region a and c b) in the region a and b c) only in the region a d) only in the region c
Chemistry - Atomic Structure Atomic Structure
Marked right : 42.94234592445328% students | Marked incorrect : 11.928429423459244% students | Marked not attempted : 45.12922465208747% students

Correct Option: a

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4. What is the molar solubility of  in  solution? Given that, solubility product of

 a) b) c) d)
Chemistry - Solutions Solutions
Marked right : 18.911174785100286% students | Marked incorrect : 9.455587392550143% students | Marked not attempted : 71.63323782234957% students

Correct Option: d

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5. Gven :

$Co^{3+}+ e^{-}\rightarrow Co^{2+}+;E^{0}=+1.81V$

$Pb^{4+}+2 e^{-}\rightarrow Pb^{2+}+;E^{0}=+1.67V$

$Ce^{4+}+ e^{-}\rightarrow Ce^{3+}+;E^{0}=+1.61V$

$Bi ^{3+}+ 3e^{-}\rightarrow Bi;E^{0}=+0.20 V$

Oxidising power of the species will increase in the  order:

 a) b) c) d)
Chemistry - Redox Reaction and Electrochemistry
Marked right : 36.1890694239291% students | Marked incorrect : 14.47562776957164% students | Marked not attempted : 49.33530280649926% students

Correct Option: a

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6. An organic compound 'A' is oxidized with  followed by boiling with . The resultant solution is then treated with ammonium molybdate to yield a yellow precipitate.

Based on above observation, the element present in the given compound is :

 a) Sulphur b) Nitrogen c) Phosphorus d) Fluorine
Chemistry - p- d- and f-block elements p- Block Elements Some p-Block elements
Marked right : 23.36182336182336% students | Marked incorrect : 16.80911680911681% students | Marked not attempted : 59.82905982905983% students

Correct Option: c

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7. Enthalpy of sublimation of iodine is $24calg^{-1}$ at $200^{\circ}C$. If specific heat of $I_{2}\left ( s \right )$ and $I_{2}\left ( vap \right )$ are $0.055$ and $0.031calg^{-1}K^{-1}$ respectively, then enthalpy of sublimation of iodine at $250^{\circ}C$ in $cal\: g^{-1}$ is :

 a) 2.85 b) 22.8 c) 5.7 d) 11.4
Chemistry - Chemical Thermodynamics
Marked right : 0.7210575510749099% students | Marked incorrect : 1.2284684203498466% students | Marked not attempted : 98.05047402857524% students

Correct Option: b

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8. In the following reaction;

'A' and 'B' respectively can be :

 a) and b) and 92933 c) and d) n-Butane and Iso-butane92933
Chemistry - Chemical Kinetics and Surface Chemistry Chemical kinetics
Marked right : 26.16279069767442% students | Marked incorrect : 15.69767441860465% students | Marked not attempted : 58.139534883720934% students

Correct Option: b

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9. Which of the following is a thermosetting polymer?

 a) PVC b) Nylon 6 c) Buna-N d) Bakelite
Chemistry - Polymers Polymers Polymers
Marked right : 17.439779766001376% students | Marked incorrect : 9.346180316586373% students | Marked not attempted : 73.21403991741225% students

Correct Option: d

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10. The complex ion that will lose its crystal field stabilization energy upon oxidation of its metal to +3 state is:

 a) b) c) d)
Chemistry - Co-ordination Compounds Coordination compounds:
Marked right : 12.218649517684888% students | Marked incorrect : 14.14790996784566% students | Marked not attempted : 73.63344051446946% students

Correct Option: c

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11. The mole fraction of a solvent in aqueous solution of a solute is  The molality of the aqueous solution is :

 a) 0.1388 b) 0.01388 c) 1.388 d) 13.88
Chemistry - Some basic concepts in chemistry
Marked right : 8.159564823209429% students | Marked incorrect : 10.698096101541251% students | Marked not attempted : 81.14233907524931% students

Correct Option: d

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12. The correct set of species responsible for the photochemical smog is:

 a) b) c) d)
Chemistry - Biological , Industrial and Environmental chemistry Environmental Chemistry Environmental Chemistry
Marked right : 40.7488986784141% students | Marked incorrect : 15.418502202643172% students | Marked not attempted : 43.83259911894273% students

Correct Option: a

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13. The major product of the following addition reaction is

 a) b) c) d)
Chemistry - Principles of Organic Chemistry and Hydrocarbons Hydrocarbons Hydrocarbons
Marked right : 12.973369166870267% students | Marked incorrect : 10.310285853896897% students | Marked not attempted : 76.71634497923283% students

Correct Option: d

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14. The increasing order of the  of the following compound is :

 a) b) c) d)
Chemistry - Principles of Organic Chemistry and Hydrocarbons Some Basic Principles of Organic Chemistry Organic Chemistry - some Basic principles and techniques
Marked right : 17.223650385604113% students | Marked incorrect : 16.966580976863753% students | Marked not attempted : 65.80976863753213% students

Correct Option: d

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15.  of   weigh  and  of  weigh  The molar mass of  and molar mass of  in  are :

 a) b) c) d)
Chemistry - Basic concepts of Chemistry Some basic concepts in chemistry
Marked right : 17.783618046430135% students | Marked incorrect : 9.76784932106877% students | Marked not attempted : 72.4485326325011% students

Correct Option: c

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16. Complete removal of both the axial ligands (along the z-axis) from an octahedral complex leads to which of the following splitting patterns? ( relative orbital energies not on scale).

 a) b) c) d)
Chemistry - Co-ordination Compounds Coordination compounds:
Marked right : 17.55485893416928% students | Marked incorrect : 12.852664576802509% students | Marked not attempted : 69.59247648902821% students

Correct Option: b

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17. The major product(s) obtained in the following reaction is/ are:

The products are:

 a) b) c) d)
Chemistry - Principles of Organic Chemistry and Hydrocarbons Hydrocarbons Hydrocarbons
Marked right : 19.08256880733945% students | Marked incorrect : 20.91743119266055% students | Marked not attempted : 60.0% students

Correct Option: d

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18. An ideal gas is allowed to expand from 1L to 10L against a constant external pressure of 1 bar. The work done in kJ is :

 a) 10 b) -9 c) -2 d) -0.9
Chemistry - Chemical Thermodynamics
Marked right : 13.717693836978132% students | Marked incorrect : 21.669980119284293% students | Marked not attempted : 64.61232604373758% students

Correct Option: d

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19. Which of the following statements is not true about RNA?

 a) It controls the synthesis protein b) It usually does not replicate c) It has always double stranded -helix structure d) It is present in the nucleus of the cell.
Chemistry - Biomolecules Biomolecules
Marked right : 12.996219281663516% students | Marked incorrect : 6.1672967863894135% students | Marked not attempted : 80.83648393194707% students

Correct Option: c

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20. The basic structural unit of feldspar, zeolites, mica, and asbestos is :

 a) b) c) d)
Chemistry - p- d- and f-block elements p- Block Elements Some p-Block elements
Marked right : 25.0% students | Marked incorrect : 17.46987951807229% students | Marked not attempted : 57.53012048192772% students

Correct Option: c

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21. But-2-ene on reaction with alkaline  at elevated temperature followed by acidification will give:

 a) molecules of b) molecules of c) one molecule of  and one molecule of d)
Chemistry - Principles of Organic Chemistry and Hydrocarbons Hydrocarbons Hydrocarbons
Marked right : 28.406466512702078% students | Marked incorrect : 17.782909930715935% students | Marked not attempted : 53.81062355658198% students

Correct Option: a

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22. The major product of the following reaction is :

 a) b) c) d)
Chemistry - Carboxylic Acids and their derivatives Organic Compounds containing Oxygen
Marked right : 2.3301447142506744% students | Marked incorrect : 6.5244051999018895% students | Marked not attempted : 91.14545008584743% students

Correct Option: c

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23. The group number, number of valence electrons, and valency of an element with atomic number 15, respectively are:

 a) and b) and c) and d) and
Chemistry - Classification of elements and periodicity in properties Classification of Elements and Periodic table
Marked right : 54.888888888888886% students | Marked incorrect : 5.777777777777778% students | Marked not attempted : 39.33333333333333% students

Correct Option: a

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24. The idea of froth floatation method came from a person X and this method is related to the process Y of ores. X and Y respectively, are :

 a) washer woman and concentration b) fisher man and reduction c) washer man and reduction d) fisher woman and concentration
Chemistry - General Principle and process of Isolation of metals General Principles and processes of Isolation Elements
Marked right : 50.171232876712324% students | Marked incorrect : 9.58904109589041% students | Marked not attempted : 40.23972602739726% students

Correct Option: a

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25. Glucose and Galactose are having identical configuration in all the positions except position.

 a) b) c) d)
Chemistry - Biomolecules
Marked right : 44.73684210526316% students | Marked incorrect : 17.36842105263158% students | Marked not attempted : 37.89473684210527% students

Correct Option: d

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26. Peptization is a :

 a) process of bringing colloidal molecule into solution b) process of converting soluble particles to form colloidal solution c) process of converting precipitate into colloidal solution d) process of converting a colloidal solution into precipitate
Chemistry - Chemical Kinetics and Surface Chemistry Surface Chemistry Surface Chemistry
Marked right : 46.2111801242236% students | Marked incorrect : 20.124223602484474% students | Marked not attempted : 33.66459627329193% students

Correct Option: c

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27. An example of a disproportionation reaction is :

 a) b) c) d)
Chemistry - Redox Reaction and Electrochemistry Redox Reactions
Marked right : 4.051747372203756% students | Marked incorrect : 8.78627257209595% students | Marked not attempted : 87.1619800557003% students

Correct Option: a

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28. The metal that gives hydrogen gas upon treatment with both acid as well as base is :

 a) zinc b) iron c) mercury d) magnesium
Chemistry - p- d- and f-block elements d - and f - BLOCK ELEMENTS d and f Block Elements
Marked right : 38.258575197889186% students | Marked incorrect : 12.66490765171504% students | Marked not attempted : 49.07651715039577% students

Correct Option: a

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29. An element has a face-centred cubic (fcc) structure with a cell edge of a. The distance between the centres of two nearest tetrahedral voids in the lattice is :

 a) b) a c) d)
Chemistry - States of Matter States of matter Solid state
Marked right : 23.036649214659686% students | Marked incorrect : 16.230366492146597% students | Marked not attempted : 60.73298429319372% students

Correct Option: a

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30. The major products of the following reaction are :

 a) and Methanol b) and Methanol c) and Formic acid d) and Formic acid
Chemistry - Organic Compounds with Functional Groups Containing Oxygen and Nitrogen Organic Compounds containing Oxygen Alcohols, Phenols and Ethers Aldehydes, Ketones and Carboxylic Acids
Marked right : 11.200000000000001% students | Marked incorrect : 22.400000000000002% students | Marked not attempted : 66.4% students