A parallel plate capacitor with square plates is filled with four dielectrics of dielectric constants K_1, K_2, K_3, K_4 arranged as shown in the figure. The effective dielectric constant K will be:

K = ((K_1+K_2)(K_3+K_4))/(K_1+K_2+K_3+K_4)

For the reaction, 2A+B→ products, when the concentration of A and B both were doubled, the rate of the reaction increased from 0.3 mol L^-1s^-1 to 2.4 mol L^-1s^-1 . When the concentration of A alone is doubled, the rate increased from 0.3 mol L^-1s^-1 to 0.6 mol L^-1s^-1 . Which one of the followin

Order of the reaction with respect to B is 2

The correct match between Item I and Item II is:

(A) → (R); (B) → (Q); (C) → (P)

JEE Main 2019 January 09, Shift 2 Question Paper with Solutions

All 90 questions from the JEE Main 2019 (January 09, Shift 2) shift — Physics (30), Chemistry (30) and Mathematics (30) — each with the correct answer (answer key) and a step-by-step solution. Read it free online, or attempt the full paper as a timed mock test.

Physics PYQs 2019 Chemistry PYQs 2019 Mathematics PYQs 2019

Chemistry30 questions

Q31Single correctSome Basic Concepts in Chemistry

For the following reaction, the mass of water produced from

445 g of C_{57} H_{110} O_{6}

is:

2 C_{57} H_{110} O_{6} (s) + 163 O_{2} (g) \to 114 CO_{2} (g) + 110 H_{2} O (l)

(A)

490 g

(B)

890 g

(C)

445 g

(D)

495 g

Q32Single correctAtomic Structure

Which of the following combination of statements is true regarding the interpretation of the atomic orbitals?
(A) An electron in an orbital of high angular momentum stays away from the nucleus than an electron in the orbital of lower angular momentum.
(B) For a given value of the principal quantum number, the size of the orbit is inversely proportional to the azimuthal quantum number.
(C) According to wave mechanics, the ground state angular momentum is equal to

\frac{h}{2 π}

.
(D) The plot of

ψ

Vs r for various azimuthal quantum numbers, shows peak shifting towards higher r value.

(A)

(B), (C)

(B)

(A), (B)

(C)

(A), (C)

(D)

(A), (D)

Q33Single correctClassification of Elements and Periodicity in Properties

When the first electron gain enthalpy

(Δ H_{e g})

of oxygen is

- 141 k J / mol

, its second electron gain enthalpy is:

(A)

A positive value

(B)

Almost the same as that of the first

(C)

Negative, but less negative than the first

(D)

A more negative value than the first

Q34Single correctChemical Bonding and Molecular Structure

In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic?

(A)

O_{2} \to O_{2}^{+}

(B)

NO \to N O^{+}

(C)

O_{2} \to O_{2}^{-}

(D)

N_{2} \to N_{2}^{+}

Q35Single correctChemical Thermodynamics

The entropy change associated with the conversion of 1 kg of ice at 273 K to water vapours at 383 K is: (Specific heat of water liquid and water vapour are 4.2

k J K^{- 1} k g^{- 1}

and 2.0

k J K^{- 1} k g^{- 1}

; heat of liquid fusion and vaporization of water are 334

k J k g^{- 1}

and 2491

k J k g^{- 1}

, respectively.) (

lo g 273 = 2.436, lo g 373 = 2.572, lo g 383 = 2.583

)

(A)

9.26 k J k g^{- 1} K^{- 1}

(B)

2.64 k J k g^{- 1} K^{- 1}

(C)

8.49 k J k g^{- 1} K^{- 1}

(D)

7.90 k J k g^{- 1} K^{- 1}

Q36Single correctp-Block Elements

The temporary hardness of water is due to:

(A)

Na_{2} SO_{4}

(B)

NaCl

(C)

CaCl_{2}

(D)

Ca(HCO_{3})_{2}

Q37Single correctp-Block Elements

The metal that forms nitride by reacting directly with

N_{2}

of air is:

(A)

Li

(B)

Rb

(C)

Cs

(D)

K

Q38Single correctHydrocarbons

Which of the following compounds is not aromatic?

(A)

Cyclopentadienyl ring with a circled minus charge (cyclopentadienyl anion).

(B)

Pyridine ring with nitrogen at the bottom vertex.

(C)

Pyrrole ring with an N-H at the bottom vertex.

(D)

Cyclopentadienyl ring with a circled plus charge (cyclopentadienyl cation).

Q39Single correctEquilibrium

The pH of rain water is approximately:

(A)

5.6

(B)

6.5

(C)

7.5

(D)

7.0

Q40Single correctp-Block Elements

Which of the following conditions in drinking water causes methemoglobinemia?

(A)

> 50

ppm of nitrate

(B)

> 50

ppm of chloride

(C)

> 100

ppm of sulphate

(D)

> 50

ppm of lead

Q41Single correctSome Basic Concepts in Chemistry

10 0^{\circ} C

, copper (Cu) has FCC unit cell structure with cell edge length of

a \overset{˚}{A}

. What is the approximate density of Cu (in

g c m^{- 3}

) at this temperature?
[Atomic Mass of

C u = 63.55 u

]

(A)

\frac{105}{a ^{3}}

(B)

\frac{205}{a ^{3}}

(C)

\frac{422}{a ^{3}}

(D)

\frac{211}{a ^{3}}

Q42Single correctSolutions

A solution containing 62 g ethylene glycol in 250 g water is cooled to

- 1 0^{\circ} C

. If

K_{f}

for water is 1.86 K

k g mol^{- 1}

, the amount of water (in g ) separated as ice is:

(A)

48

(B)

64

(C)

16

(D)

32

Q43Single correctRedox Reactions and Electrochemistry

If the standard electrode potential for a cell is 2 V at 300 K, the equilibrium constant (K) for the reaction.

Z n (s) + C u^{2 +} (a q) ⇌ Z n^{2 +} (a q) + C u (s)

at 300 K is approximately

(R = 8 J K^{- 1} mol^{- 1}, F = 96000 C mol^{- 1})

(A)

e^{- 160}

(B)

e^{- 80}

(C)

e^{160}

(D)

e^{320}

Q44Single correctChemical Kinetics

For the reaction,

2 A + B \to

products, when the concentration of A and B both were doubled, the rate of the reaction increased from

0.3 mol L^{- 1} s^{- 1}

2.4 mol L^{- 1} s^{- 1}

. When the concentration of A alone is doubled, the rate increased from

0.3 mol L^{- 1} s^{- 1}

0.6 mol L^{- 1} s^{- 1}

. Which one of the following statements is correct?

(A)

Order of the reaction with respect to

B

2

(B)

Total order of the reaction is

4

(C)

Order of the reaction with respect to

A

2

(D)

Order of the reaction with respect to

B

1

Q45Single correctEquilibrium

Consider the following reversible chemical reactions:

A_{2} (g) + B_{2} (g) ⇌ K_{1} 2 A B (g) .... (1)

6 A B (g) ⇌ K_{2} 3 A_{2} (g) + 3 B_{2} (g) .... (2)

The relationship between

K_{1}

and

K_{2}

is:

(A)

K_{2} = K_{1}^{- 3}

(B)

K_{1} K_{2} = \frac{1}{3}

(C)

K_{2} = K_{1}^{3}

(D)

K_{1} K_{2} = 3

Q46Single correctSurface Chemistry

For coagulation of arsenious sulphide sol, which of the following salt solutions will be most effective?

(A)

Na_{3} PO_{4}

(B)

NaCl

(C)

AlCl_{3}

(D)

BaCl_{2}

Q47Single correctSurface Chemistry

Match Item I with Item II

Item I	Item II
(A). Benzaldehyde	(P). Mobile phase
(B). Alumina	(Q). Adsorbent
(C). Acetonitrile	(R). Adsorbate

(A)

(A) \to (P); (B) \to (R); (C) \to (Q)

(B)

(A) \to (R); (B) \to (Q); (C) \to (P)

(C)

(A) \to (Q); (B) \to (P); (C) \to (R)

(D)

(A) \to (Q); (B) \to (R); (C) \to (P)

Q48Single correctGeneral Principles and Processes of Isolation of Metals

The correct statement regarding the given Ellingham diagram is:

Ellingham diagram of Delta G versus temperature showing oxide-formation lines for Cu, Zn, C and Al.

(A)

140 0^{\circ} C

, Al can be used for the extraction of Zn from ZnO

(B)

50 0^{\circ} C

, coke can be used for the extraction of Zn from ZnO

(C)

80 0^{\circ} C

, Cu can be used for the extraction of Zn from ZnO

(D)

Coke cannot be used for the extraction of Cu from

C u_{2} O

Q49Single correctp- Block Elements

Good reducing nature of

H_{3} P O_{2}

is attributed to the presence of:

(A)

One

P - H

bond

(B)

Two

P - O H

bonds

(C)

Two

P - H

bonds

(D)

One

P - O H

bond

Q50Single correctd- and f-Block Elements

The transition element that has the lowest enthalpy of atomisation is:

(A)

V

(B)

F e

(C)

Z n

(D)

C u

Q51Single correctCoordination Compounds

Homoleptic octahedral complexes of a metal ion

M^{3 +}

with three monodentate ligands

L_{1}

L_{2}

and

L_{3}

absorb wavelengths in the region of green, blue and red respectively. The increasing order of the ligand strength is:

(A)

L_{3} > L_{1} > L_{2}

(B)

L_{1} > L_{2} > L_{3}

(C)

L_{2} > L_{1} > L_{3}

(D)

L_{3} > L_{2} > L_{1}

Q52Single correctCoordination Compounds

The complex that has highest crystal field splitting energy

(Δ)

, is:

(A)

K_{3} [C o (CN)_{6}]

(B)

[C o (N H_{3})_{5} Cl] C l_{2}

(C)

[C o (N H_{3})_{5} (H_{2} O)] C l_{3}

(D)

K_{2} [CoCl_{4}]

Q53Single correctHydrocarbons

The major product of the following reaction is:

Succinic anhydride plus o-cresol (benzene with OH and ortho CH3), arrow labelled AlCl3, heat.

(A)

1-tetralone with hydroxyl on the aromatic ring and an ortho methyl.

(B)

Hydroxy-methyl 1-indanone with a methyl on the five-membered ring.

(C)

1-tetralone with aromatic hydroxyl and an ortho methyl, carbonyl on the opposite side.

(D)

Hydroxy-methyl 1-indanone, carbonyl on the right and a methyl on the five-membered ring.

Q54Single correctOrganic Compounds Containing Oxygen

The products formed in the reaction of cumene with

O_{2}

followed by treatment with dil HCl are:

(A)

(B)

(C)

(D)

Q55Single correctOrganic Compounds Containing Oxygen

The major product formed in the following reaction is:

Acetone plus acetophenone (benzene ring bearing a CO-CH3), arrow labelled dilute NaOH.

(A)

(B)

(C)

(D)

Q56Single correctOrganic Compounds Containing Oxygen

The test performed on compound x and their inferences are:
Test | Inference |
(a) 2, 4 -

D NP

(x)

is:

(A)

(B)

(C)

Benzene with ortho N(CH3)2 and a ring-attached acetyl group CO-CH3.

(D)

Q57Single correctOrganic Compounds Containing Nitrogen

The major product obtained in the following reaction is:

Benzene with ortho phenol OH and a gem-dimethyl benzylic carbon linked to CH(CH3)NH2; arrow (CH3CO)2O / pyridine (1 eqv.), RT.

(A)

(B)

(C)

Benzene with ortho COCH3 and a C(OH)(CH3)-CH(CH3)-NH2 side chain.

(D)

Q58Single correctOrganic Compounds Containing Nitrogen

The increasing basicity order of the following compounds is:
(A)

C H_{3} C H_{2} N H_{2}

(B)

C H_{3} - C H_{2} - N H - C H_{2} - C H_{3}

(C)

H_{3} C - C H_{3} ∣ N - C H_{3}

(D)

P h - H ∣ N - H

(A)

(D) < (C) < (B) < (A)

(B)

(D) < (C) < (A) < (B)

(C)

(A) < (B) < (C) < (D)

(D)

(A) < (B) < (D) < (C)

Q59Single correctOrganic Compounds Containing Nitrogen

The major product of the following reaction is:

Benzene with ortho C(=O)NH2 and CH2CH3; arrow (i) Br2/hv (ii) KOH dilute.

(A)

Indoline: benzene fused to a saturated 5-membered ring containing NH.

(B)

3-Methylisoindolin-1-one: benzene fused to a 5-membered ring with C=O, NH, CH(CH3).

(C)

3,4-Dihydroisoquinolin-1(2H)-one: benzene fused to a 6-membered lactam.

(D)

Benzene fused to a 4-membered ring bearing NH and CH(CH3).

Q60Single correctBiomolecules

The correct sequence of amino acids present in the tripeptide given below is:

Tripeptide drawn N-terminal to C-terminal with the three alpha-carbon side chains and two amide linkages.

(A)

Val - Ser - Thr

(B)

Leu - Ser - Thr

(C)

Thr - Ser - Val

(D)

Thr - Ser - Leu

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Frequently Asked Questions

How many questions are in the JEE Main 2019 January 09, Shift 2 paper?

The JEE Main 2019 January 09, Shift 2 paper has 90 questions — Physics (30), Chemistry (30) and Mathematics (30). Every question is on this page with its correct answer and a step-by-step solution.

What is the marking scheme for JEE Main?

JEE Main awards +4 marks for each correct answer and −1 for a wrong answer, with 0 for questions left unattempted. The paper covers Physics, Chemistry and Mathematics.

Are the answer key and step-by-step solutions provided for the 2019 January 09, Shift 2 paper?

Yes — every question shows the correct answer (answer key) and a detailed step-by-step solution, free to read online.

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JEE Main 2019 January 09, Shift 2 Question Paper with Solutions

Physics30 questions

Chemistry30 questions

Mathematics30 questions

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