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JEE Main 2021 Question Paper with Solutions- 25 Feb C2

Get free JEE Main 2021 question paper with solutions here. This blog contains solutions of 25 February 2021 question paper.

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Posted by Mahak Jain, 31/3/2021
JEE Main 2021 Question Paper with Solutions- 25 Feb C2

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JEE Main 2021 Question paper (Official) with solutions for February session has been released. It is released separately for four session in February, March, April and May sessions. JEE Main is conducted for providing admission into UG engineering (B.Tech) / architecture courses (B.Arch). These courses are offered by various IITs, NITs and IIITs and other government and non-government engineering institutions. JEE Main question paper and answer key is released by the National Testing Agency (NTA). And solutions are prepared by Kunduz tutors for you. Through this blog, candidates can get the JEE Main 2021 question paper with solutions and also previous year answer key and question papers with all solutions.

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JEE Main 2021 Question Paper with Solutions- 25 February Shift 2

Chemistry JEE Main 2021 Question Paper with Solutions 25 Feb Shift 1

Question 1

Carbylamine test is used to detect the presence of primary amino group in an organic compound. Which of the following compound is formed when this test is performed with aniline?

Correct answer: 4

Question 2

What is ‘X’ in the given reaction?

OHCH2-CH2OH + oxalic acid → X (major product)

  1. OHC-CHO
  2. CH2=CH2
  3. OH-CH2=CH2
  4. OH-CH2-CHO

Correct answer: 2

Question 3

The major components of German Silver are:

  1. Cu, Zn and Ni
  2. Zn, Ni and Ag
  3. Ge, Cu and Ag
  4. Cu, Zn and Ag

Correct answer: 1

Question 4

Which among the following species has unequal bond lengths?

  1. XeF4
  2. BF4
  3. SF4
  4. SiF4

Correct answer: 3

Question 5

Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?

  1. Hydrochloric acid
  2. Sodium hydroxide
  3. Ammonia
  4. Nitric acid

Correct answer: 4

Question 6

The major product of the following reaction is:

Correct answer: 2

Question 7

In which of the following order the given complex ions are arranged correctly with respect to their decreasing spin only magnetic moment?

i. [FeF6]3-

ii. [Co(NH3)6]3+

iii. [NiCl4]2-

iv. [Cu(NH3)4]2+

  1. (iii)>(iv)>(ii)>(i)
  2. (ii)>(iii)>(i)>(iv)
  3. (i)>(iii)>(iv)>(ii)
  4. (ii)>(i)>(iii)>(iv)

Correct answer: 3

Question 8

Water does not produce CO on reacting with:

  1. C
  2. CH4
  3. CO2
  4. C3H8

Correct answer: 3

Question 9

The correct order of bond dissociation enthalpy of halogens is:

  1. Cl2>Br2>F2>I2
  2. F2>Cl2>Br2>I2
  3. Cl2>F2>Br2>I2
  4. I2>Br2>Cl2>F2

Correct answer: 1

Question 10

The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethyl benzene from benzene is:

  1. CH3COCl/AlCl3, Zn-Hg/HCl, Br2/AlBr3, HNO3/H2SO4
  2. HNO3/H2SO4, Br2/AlCl3,CH3COCl/AlCl3, Zn-Hg/HCl
  3. CH3COCl/AlCl3, Br2/AlBr3, HNO3/H2SO4, Zn/HCl
  4. Br2/AlBr3, CH3COCl/AlCl3, HNO3/H2SO4, Zn/HCl

Correct answer: 1

Question 11

Which of the following is correct structure of α-anomer of maltose ?

Correct answer: 4

Question 12

The solubility of Ca(OH)2 in water is :

[Given : The solubility product of Ca(OH)2 in water = 5.5 × 10–6]

  1. 1.77 × 10–2
  2. 1.11 × 10–2
  3. 1.77 × 10–6
  4. 1.11 × 10–6

Correct answer: 2

Question 13

Which one of the following statements is FALSE for hydrophilic sols ?

  1. Their viscosity is of the order of that of H2O
  2. They do not require electrolytes for stability
  3. These sols are reversible in nature
  4. The sols cannot be easily coagulated

Correct answer: 1

Question 14

The major product of the following reaction is :

Correct answer: 3

Question 15

Given below are two statements :

Statement I : The identification of Ni2+ is carried out by Dimethylglyoxime in the presence of NH4OH.

Statement II : The Dimethylglyoxime is a bidentate neutral ligand.

In the light of the above statements, choose the correct answer from the options given below :

  1. Both Statement I and Statement II are true
  2. Statement I is true but Statement II is false
  3. Both Statement I and Statement II are false
  4. Statement I is false but Statement II is true

Correct answer: 2

Question 16

The correct order of acid character of the following compounds is :

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

Correct answer: 2

Question 17

The method used for the purification of Indium is :

  1. Vapour phase refining
  2. Zone refining
  3. Liquation
  4. van Arkel method

Correct answer: 2

Question 18

Correct statement about the given chemical reaction is :

  1. The reaction will form sulphonated product instead of nitration.
  2. Reaction is possible and compound (B) will be the major product.
  3. Reaction is possible and compound (A) will be major product.
  4. – °°NH2 group is ortho and para directive, so product (B) is not possible.

Correct answer: 3

Question 19

Given below are two statements :

Statement I : The pH of rain water is normally ~5.6.

Statement II : If the pH of rain water drops below 5.6, it is called acid rain.

In the light of the above statements, choose the correct answer from the options given below:

  1. Both Statement I and Statement II are false.
  2. Statement I is false but Statement II is true.
  3. Both Statement I and Statement II are true.
  4. Statement I is true but Statement II is false.

Correct answer: 3

Question 20

Given below are two statements :

Statement I : α and β forms of sulphur can change reversibly between themselves with slow heating or slow cooling.

Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur.

In the light of the above statements, choose the correct answer from the options given below:

  1. Both Statement I and Statement II are true.
  2. Both Statement I and Statement II are false.
  3. Statement I is true but Statement II is false.
  4. Statement I is false but Statement II is true.

Correct answer: 3

Question 21

The unit cell of copper corresponds to a face centered cube of edge length 3.596 Å with one copper atom at each lattice point. The calculated density of copper in kg/m3 is _. [Molar mass of Cu : 63.54 g; Avogadro Number = 6.022×1023]

Correct answer: 9077

Question 22

The spin only magnetic moment of a divalent ion in aqueous solution (atomic number 29) is

Correct answer: 2

Question 23

Copper reduces NO3 into NO and NO2 depending upon the concentration of HNO3 in solution. (Assuming fixed [Cu2+] and PNO=PNO2 ), the HNO3 concentration at which the thermodynamic tendency for reduction of NO3 into NO and NO2 by copper is same is 10x M. The value of 2x is __. (Rounded-off to the nearest integer)

Correct answer: Incomplete data

Question 24

The rate constant of a reaction increases by five times on increase in temperature from 27°C to 52°C. The value of activation energy in kJ mol–1 is _. (Rounded-off to the nearest integer) [R = 8.314 J K–1 mol–1]

Correct answer: 52

Question 25

Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is __. (Integer answer)

  1. Li
  2. Na
  3. Rb
  4. Cs

Correct answer: 1

Question 26

If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 2.5 K rise in the boiling point of the solution is __ molal. (Rounded-off to the nearest integer) [Kb = 0.52 K kg mol–1]

Correct answer: 3

Question 27

Electromagnetic radiation of wavelength 663 nm is just sufficient to ionise the atom of metal A. The ionization energy of metal A in kJ mol–1 is __. (Rounded-off to the nearest integer)

[h = 6.63 × 10–34 Js, c = 3.00 × 108 ms–1, NA = 6.02 × 1023 mol–1]

Correct answer: 181

Question 28

Consider titration of NaOH solution versus 1.25 M oxalic acid solution. At the end point following burette readings were obtained.

1. 4.5 mL

2. 4.5 mL

3. 4.4 mL

4. 4.4 mL

5. 4.4 mL

If the volume of oxalic acid taken was 10.0 mL then the molarity of the NaOH solution is __ M. (Rounded-off to the nearest integer)

Correct answer: 6

Question 29

Five moles of an ideal gas at 293 K is expanded isothermally from an initial pressure of 2.1 MPa to 1.3 MPa against at constant external pressure 4.3 MPa. The heat transferred in this process is____kJ mol–1. (Rounded-off to the nearest integer) [Use R = 8.314 J mol–1K–1]

Correct answer: 15

Question 30

The number of compound/s given below which contain/s —COOH group is __ . (Integer answer)

  1. Sulphanilic acid
  2. Picric acid
  3. Aspirin
  4. Ascorbic Acid

Correct answer: 1

JEE Main Frequently Asked Questions (FAQs)

Question 1: When is JEE Main 2021 exams?

Answer: National Testing Agency has announced dates for all phases of JEE Main. First phase is in February 2021 (23, 24, 25 and 26). Second phase is in March 2021 (15, 16, 17 & 18) , third in April 2021 (27, 28, 29 & 30) and fourth in May 2021 (24, 25, 26, 27 & 28). To get more details about JEE Main click here.

Question 2: Can I challenge JEE Main 2021 answer key? How?

Answer: Yes, candidates who have objection to the answer key given by National Testing Agency can go to jeemain.nta.nic.in , from where they can challenge answer key.

Question 3: Does National Testing Agency refund JEE Mains 2021 answer key fees.

Answer: Yes, National Testing Agency refund fees if objection is found valid with proper supporting documents.

Question 4: Who will conduct JEE Main 2021 Counseling?

Answer: Joint Seat Allocation Authority (JoSAA) is responsible for counseling of JEE Main 2021 qualified students.


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