JEE Mains 2019 Solved Question Paper- 9 Jan C1

Attempting question papers is best way to practice. In this blog you have JEE Mains 2019 solved question paper for 9^th January shift 1.

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JEE Mains 2019 Solved Question Paper- 9 January Shift 1

Chemistry

Question 1

Which one of the following statement regarding Henry’s law is not correct?

1. Higher the value of K_H  at a given pressure, higher is the solubility of the gas in the liquids.
2. Different gases have different K_H (Henry’s law constant) value at the same tempreture
3. The mole fraction of the gas in the  solution in vapour phase is proportional to the partial pressure of the gas
4. The value of K_H  incerases with increase of temperature and K_H is dependant on the nature of the gas

Correct answer: 1

Question 2

The correct decreasing order for acid strength is :

1. NO₂CH₂COOH > NCCH₂COOH > FCH₂COOH > ClCH₂COOH
2. FCH₂COOH > NCCH₂COOH > NO₂CH₂COOH > ClCH₂COOH
3. NO₂CH₂COOH > FCH₂COOH > NCCH₂COOH > ClCH₂COOH
4. NCCH₂COOH > NO₂CH₂COOH > FCH₂COOH > ClCH₂COOH

Correct answer: 1

Question 3

Two complexes [Cr(H₂O)₆]Cl₃(A) and [Cr(NH₃)₆]Cl₃(B) are violet and yellow  coloured ,respectively. The incorrect statement regarding them is :

1. △₀ value for (A) is less than that of (B)
2. △₀ values of (A) and (B) are calculated from the energies of violet and yellow light ,respectively
3. both absorb energies corresponding to their complementary colors
4. both are paramagnetic with three unpaired electrons.

Correct answer: 2

Question 4

Adsorption of gas follows Freundlich adsorbtin isotherm. In the given plox ,x is the mass of the gas on mass m of the adsorbent at pressure P. x/m is proportional to:

1. p¼
2. p²
3. p
4. p½

Correct answer: 4

Question 5

Correct statements among a to d regarding silicones are :

(a) They are polymers with hydrophobic character

(b) They are biocompatible

(c) In general, they have high thermal stability and low dielectric strength.

(d) Usually, they are resistant to oxidation and used as greases

1. (a), (b) and (c) only
2. (a) and (b) only
3. (a), (b), (c) and (d)
4. (a), (b) and (d) only

Correct answer: 3

Question 6

For emission line of atomic hydrogen from n_i=8 to n_f=n, the plot of wave number against (1/n²) will be  (The Rydberg constant is in wave number unit)

1. Linear with slope -R_H
2. Linear with intercept -R_H
3. Non linear
4. Linear with slope R_H

Correct answer: 4

Question 7

The major product of the following reaction is:

1.
2.
3.
4.

Correct answer: 4

Question 8

The alkaline earth metal nitrate that does not crystallize with water molecules, is:

1. Sr(NO₃)₂
2. Mg(NO₃)₂
3. Ca(NO₃)₂
4. Ba(NO₃)₂

Correct answer: 4

Question 9

Major product of the following reaction is:

1.
2.
3.
4.

Correct answer: 4

Question 10

The highest value of the calculated spin-only magnetic moment (in BM) among all the transition metal complexes is :

1. 5.92
2. 3.87
3. 6.93
4. 4.90

Correct answer: 1

Question 11

20 mL of 0.1 M H₂SO₄ solution is added to 30 mL of 0.2 M NH₄OH solution. The pH of the resultant mixture is: [pk_b of NH₄OH = 4.7]

1. 9.4
2. 5.0
3. 9.0
4. 5.2

Correct answer: 3

Question 12

0.5 moles of gas A and x moles of gas B exert a pressure of 200 Pa in a container of volume 10m³ at 1000 K .Given R is the gas constant in JK^-1mol^-1, x is:

1. 2R/(4+R)
2. 2R/(4-R)
3. (4-R)/(2R)
4. (4+R)/(2R)

Correct answer: 3

Question 13

Consider the reversible isothermal expansion of an ideal gas in  closed system at two different temperature T₁and T₂ (T₁ < T₂ ). The correct graphical depiction of the dependence of work done (W) on the final volume (V) is:

1.
2.
3.
4.

Correct answer: 2

Question 14

The major product of following reaction is:

1. RCHO
2. RCOOH
3. RCH₂NH₂
4. RCONH₂

Correct answer: 1

Question 15

In general ,the properties that decrease and increase down a group in the periodic table ,respectively are :

1. electronegativity and electron gain enthalpy
2. electronegativity and atomic radius
3. atomic radius and electronegativity
4. electron gain enthalpy and electronegativity

Correct answer: 2

Question 16

A solution of sodium sulfate contains 92g of Na⁺ ions per kilogram of water. The molality of Na⁺ ions in that solution in mol Kg^-1 is:

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

Correct answer: 3

Question 17

A  water sample has ppm level concentration of the following metals: Fe=0.2, Mn=5.0, Cu=3.0, Zn=5.0  the metal that makes the water sample unsuitable for drinking is:

1. Zn
2. Fe
3. Mn
4. Cu

Correct answer: 3

Question 18

The incresing order of pKa of the following amino acids in aqueous solution is:

Gly, Asp, Lsy, Arg

1. Asp < Gly < Arg < Lsy
2. Arg < Lsy < Gly < Asp
3. Gly < Asp < Arg < Lsy
4. Asp < Gly < Lsy < Arg

Correct answer: 1

Question 19

According to molecular orbital theory, which of the following is true with respect to Li₂⁺ and Li₂^– ?

1. Both are unstable
2. Li₂⁺ is unstable and Li₂^– is stable
3. Li₂⁺ is stable and Li₂^– is unstable
4. Both are stable

Correct answer: 4

Question 20

The following results were obtained during kinetic studies of the reaction

2A + B → Product :

The time (in minutes) required to consume half of A is:

1. 10
2. 5
3. 100
4. 1

Correct answer: 2

Question 21

The major product of the following reaction is:         

1.
2.
3.
4.

Correct answer: 1

Question 22

Arrange thefollowing amines in the decreasing order of basicity:

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

Correct answer: 4

Question 23

Which amongst the following is the strongest acid?

1. CHI₃
2. CHCl₃
3. CHBr₃
4. CH(CN)₃

Correct answer: 4

Question 24

The anodic half-cell of lead-acid battery is recharged using electicity of 0.05 faraday. The amount of PbSO₄ electrolyzed in g during the process is ;(Molar mass of PbSO₄ = 303 g/mol)

1. 22.8
2. 15.2
3. 7.6
4. 11.4

Correct answer: 2

Question 25

The one that is extensively used as a piezoelectric material is:

1. Quartz
2. Amorphous silica
3. Mica
4. Tridymite

Correct answer: 1 // Theory based

Question 26

Aluminum is usually found in +3 oxidation state. In contrast, thallium exists in +1 and +3 oxidation states .This is due to :

1. Lanthanoid contraction
2. Lattice effect
3. Diagonal relationship
4. Inert pair effect

Correct answer: 4

Question 27

The correct match between item I and item II is

1. A→Q; B→P; C→S; D→R
2. A→R; B→P; C→S; D→Q
3. A→R; B→S; C→P; D→Q
4. A→Q; B→S; C→P; D→R

Correct answer: 3

Question 28

The ore that contains both iron and copper is:

1. malachite
2. dolomite
3. azurite
4. copper pyrites

Correct answer: 4

Question 29

The compounds A and B in the following reaction are, respectively:

1. A = Benzyl alcohol, B = Benzyl isocyanide

2. A = Benzyl alcohol, B = Benzyl cyanide

3. A = Benzyl chloride, B = Benzyl cyanide

4. A = Benzyl chloride, B = Benzyl isocyanide

Correct answer: 4

Question 30

The isotopes of hydrogen are :

1. Tritium and protium only
2. Deuterium and tritium only
3. Protium and deuterIum only
4. Protium, deuterium and tritium

Correct answer: 4 // Theory based

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