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JEE Mains 2019 Solved Question Paper- 9 Jan C1

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Posted by Mahak Jain, 15/2/2021
JEE Mains 2019 Solved Question Paper- 9 Jan C1

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

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1. Before seeing JEE Mains 2019 solved question paper you should know the syllabus and exam paper pattern. Click here to know the same.

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3. Make a proper schedule. While planning out a schedule for JEE Mains preparation, it will be beneficial for you to have a properly structured schedule. Click here to read a short article on time management.

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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 KH  at a given pressure, higher is the solubility of the gas in the liquids.
  2. Different gases have different KH (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 KH  incerases with increase of temperature and KH is dependant on the nature of the gas

Correct answer: 1

Which one of the following statement regarding Henry's law is not correct JEE Mains 2019 solved question paper

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

The correct decreasing order for acid strength is JEE Mains 2019 solved question paper

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

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 JEE Mains 2019 solved question paper

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. p

Correct answer: 4

Adsorption of gas follows Freundlich adsorbtin isotherm JEE Mains 2019 solved question paper

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

Correct statements among a to d regarding silicones are JEE Mains 2019 solved question paper

Question 6

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

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

Correct answer: 4

For emission line of atomic hydrogen from ni=8 to nf=n, the plot of wave number against (1/n2) will be JEE Mains 2019 solved question paper

Question 7

The major product of the following reaction is:

1.
2.
3.
4.

Correct answer: 4

The major product of the following reaction is JEE Mains 2019 solved question paper

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

The alkaline earth metal nitrate that does not crystallize with water molecules, is JEE Mains 2019 solved question paper

Question 9

Major product of the following reaction is:

1.
2.
3.
4.

Correct answer: 4

Major product of the following reaction is JEE Mains 2019 solved question paper

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

The highest value of the calculated spin-only magnetic moment (in BM) among all the transition metal complexes is  JEE Mains 2019 solved question paper

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: [pkb of NH4OH = 4.7]

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

Correct answer: 3

20 mL of 0.1 M H2SO4 solution is added to 30 mL of 0.2 M NH4OH solution

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 10mat 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

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 JEE Mains 2019 solved question paper

Question 13

Consider the reversible isothermal expansion of an ideal gas in  closed system at two different temperature T1and T(T< 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

Consider the reversible isothermal expansion of an ideal gas in  closed system at two different temperature T1and T2

Question 14

The major product of following reaction is:

R -C\equiv N\xrightarrow[(2)H_2O]{(1)AlH(i-Bu)_2}
  1. RCHO
  2. RCOOH
  3. RCH2NH2
  4. RCONH2

Correct answer: 1

The major product of following reaction is JEE Mains 2019 solved question paper

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

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

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

A solution of sodium sulfate contains 92g of Na+ ions per kilogram of water JEE Mains 2019 solved question paper

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

A  water sample has ppm level concentration of the following metals

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

The incresing order of pKa of the following amino acids in aqueous solution is JEE Mains 2019 solved question paper

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

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

Question 20

The following results were obtained during kinetic studies of the reaction

2A + B → Product :

Experiment[A]
(mol/L)
[B]
(mol/L)
initial rate of reaction
(mol/L/min)
I0.100.206.93 ⨯ 10-3
II0.100.256.93 ⨯ 10-3
III0.200.301.386 ⨯ 10-2

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

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

Correct answer: 2

The following results were obtained during kinetic studies of the reaction JEE Mains 2019 solved question paper

Question 21

The major product of the following reaction is:         

The major product of the following reaction is

\xrightarrow[ (2) CrO3 / H+]{ (1) KOH (aqueous)}
1.
2.
3.
4.

Correct answer: 1

The major product of the following reaction is

Question 22

Arrange thefollowing amines in the decreasing order of basicity:

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

Arrange thefollowing amines in the decreasing order of basicity JEE Mains 2019 solved question paper

Question 23

Which amongst the following is the strongest acid?

  1. CHI3
  2. CHCl3
  3. CHBr3
  4. CH(CN)3

Correct answer: 4

Which amongst the following is the strongest acid

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

The anodic half-cell of lead-acid battery is recharged using electicity of 0.05 faraday JEE Mains 2019 solved question paper

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

Aluminum is usually found in +3 oxidation state JEE Mains 2019 solved question paper

Question 27

The correct match between item I and item II is

Item I
(drug)
Item II
(test)
A. chloroxylenolP. carbylamine test
B. NorethindroneQ. sodium hydrogen carbonate test
C. SulphapyridineR. ferric choride test
D. PenicillamineS. Baeyer’s test
  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

The correct match between item I and item II is

Question 28

The ore that contains both iron and copper is:

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

Correct answer: 4

The ore that contains both iron and copper is: JEE Mains 2019 solved question paper

Question 29

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

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

The compounds A and B in the following reaction are, respectively JEE Mains 2019 solved question paper

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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