JEE Main 2019 Question paper with solutions- 10 Jan C1

Attempting question papers is best way to practice. In this blog you have JEE Main 2019 solved question paper with solutions for 10^th January shift 1.

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JEE Main 2019 Question Paper with Solutions- 10 January Shift 1

Chemistry

Question 1

Two pi and half sigma bonds are present in :

1. N₂⁺
2. N₂
3. O₂⁺
4. O₂

Correct answer: 1

Question 2

The chemical nature of hydrogen peroxide is:

1. Oxidising agent in acidic medium but not in basic medium.
2. Reducing agent in basic medium , but not in acidic medium.
3. Oxidising and reducing agent in acidic medium , but not in basic medium.
4. Oxidising and reducing agent in both acidic and basic medium.

Correct answer: 4

Question 3

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

1.
2.
3.
4.

Correct answer: 4

Question 4

Which premitive unit cell has unequal edge lengths (a ≠ b ≠ c ≠) and all axial angles different from 90^o?

1. Tetragonal
2. Hexagonal
3. Monoclinic
4. Triclinic 

Correct answer: 4

Question 5

Wilkinson catalyst is :

1. (Ph₃P)₃RhCl
2. (Et₃P)₃IrCl
3. (Et₃P)₃RhCl
4. (Ph₃P)₃IrCl

Correct answer: 1

Question 6

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

1. 2 and 0
2. 3 and 2
3. 3 and 1
4. 2 and 1

Correct answer: 3

Question 7

The major product of the following reaction is:

1.
2.
3.
4.

Correct answer: 3

Question 8

The total number of isomers for a square planar complex [M(F)(Cl)(SCN)(NO₂)] is:

1. 12
2. 8
3. 16
4. 4

Correct answer: 1

Question 9

Hall-Heroult’s process is given by :

1.
2.
3.
4.

Correct answer: 3

Question 10

The value of Kp/Kc  for the following reactions at 300 K are respectively : (At 300 K , RT = 24.62 dm³atm mol^-1)

N₂O₄(g) + O₂(g) ⇌ 2NO(g) N₂O₄(g) ⇌ 2NO₂(g)

N₂(g) + H₂(g) ⇌ 2NH₃(g)

1. 1, 24.62 dm³atm mol^-1, 606.0 dm⁶atm² mol^-2

2. 1, 0.041dm^-3atm^-1 mol^-1, 606.0 dm⁶atm² mol^-2

3. 1, 0.00165 dm³atm^-2 mol^-1, 606.0 dm⁶atm² mol^-2

4. 1, 24.62 dm³atm mol^-1, 0.00165 dm^-6atm^-2 mol²

Correct answer: 4

Question 11

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

1. DCM and H₂O would stay as lower and upper layer respectively in the S.F.

2. DCM and H₂O will be miscible clearly 

3. DCM and H₂O would stay as upper and lower layer respectively in the separating funnel (S.F.)

4. DCM and H₂O will make turbid / colloidal mixture.

Correct answer: 1

Question 12

The type of hybridisation and number of lone pair (s) of electrons of Xe in XeOF₄ respectively , are :

1. sp³d and 1

2. sp³d and 2

3. sp³d² and 1

4. sp³d² and 2

Correct answer: 4

Question 13

The metal used for making X-ray tube window is :

1. Mg
2. Na
3. Ca
4. Be

Correct answer: 4

Question 14

Consider the given plots for a reaction obeying Arrhenius equation (0℃ < T < 300℃): (k and E_A are rate constant and activation energy , respectively)

1. Both I and II are wrong
2. I is wrong but II is right
3. Both I and II are correct
4. I is right but II is wrong

Correct answer: 3

Question 15

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

1. A is more polluted than B.
2. A is suitable for drinking, whereas B is not
3. B is more polluted than A
4. Both A and B are suitable for drinking

Correct answer: 3

Question 16

The increasing order of the pKa values of the following compounds is :

1. D<A<C<B
2. B<C<D<A
3. C<B<A<D
4. B<C<A<D

Correct answer: 4

Question 17

Liquids A and B form an ideal solution in the entire composition range . At 350 K , the vapor pressures of pure A and pure B are 7⨯10³ Pa and 12⨯10³ Pa, respectively. The composition of the vapor in equilibrium with a solution containing 40 mol percent of A at this temperature is :

1. X_A=0.37 ;X_B=0.63

2. X_A=0.28 ;X_B=0.72

3. X_A=0.76 ;X_B=0.24

4. X_A=0.40 ;X_B=0.60

Correct answer: 2

Question 18

Consider the following reduction processes

The reducing power of the metals increases in order :

1. Ca < Zn < Mg < Ni
2. Ni < Zn < Mg < Ca
3. Zn < Mg < Ni < Ca
4. Ca < Mg < Zn < Ni

Correct answer: 2

Question 19

The major product of the following reaction is:

1.
2.
3.
4.

Correct answer: 4

Question 20

The electronegativity of aluminium is similar to :

1. Boron
2. Carbon
3. Lithium
4. Beryllium

Correct answer: 4

Question 21

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

1. IV>II>III>I
2. III>II>I>IV
3. III>II>I>IV
4. II>III>IV>I

Correct answer: 2

Question 22

A process has △H=200J/mol and △S=40J/K/mol. Out  of the values given below, choose the minimum temperature (in K) above which the process will be spontaneous :

1. 5K
2. 4K
3. 20K
4. 12K

Correct answer: 1

Question 23

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

1.
2.
3.
4.

Correct answer: 3

Question 24

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

1. Ostwald’s process
2. Haber’s process
3. Combustion of coal
4. Hydrogenation of vegetable oils

Correct answer: 3

Question 25

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

1. Decrease in both atomic and ionic radii
2. Increase in atomic radii and decrease in ionic radii
3. Increase in both atomic and ionic radii
4. Decrease in atomic radii and increase in ionic radii.

Correct answer: 1

Question 26

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

1.
2.
3.
4.

Correct answer: Bonus

Question 27

The correct structure of product ‘P’ in the following reaction is :

1.
2.
3.
4.

Correct answer: 2

Question 28

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

_δCH₃–_γCH₂–_βCH=_αCH₂

1. β-hydrogen
2. γ-hydrogen
3. δ-hydrogen
4. α-hydrogen

Correct answer: 2

Question 29

The major product ‘X’ formed in the following reaction is:

1.
2.
3.
4.

Correct answer: 4

Question 30

A mixture of 100 m mol of Ca(OH)₂ and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL .The mass of calcium sulphate formed and the concentration of OH^– in resulting solution, respectively , are  : (Molar mass of  Ca(OH)₂, Na₂SO₄ and CaSO₄ are 74, 143 and 136 g/mol, respectively: K_sp of Ca(OH)₂ is 5.5⨯10^-6

1. 1.9 g, 0.14 mol/L
2. 13.6 g, 0.14 mol/L
3. 1.9 g, 0.28 mol/L
4. 13.6 g, 0.28 mol/L

Correct answer: 3

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