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JEE Mains 2021 Question Paper with Solutions- 24 Feb C1

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Posted by Mahak Jain, 16/3/2021
JEE Mains 2021 Question Paper with Solutions- 24 Feb C1

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Attempting question papers is best way to practice. In this blog you have JEE Mains 2021 question paper with solutions for 24th February shift 1.

In this blog we provide you JEE Mains 2021 question paper with solutions for free. Here at Kunduz we aim to provide quality solutions from best tutors at Kunduz. These solutions for JEE Mains 2021 question paper are prepared by Kunduz tutors.

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JEE Mains 2021 Question Paper with Solutions- 24 February Shift 1

Chemistry

Question 1

Coordination number of atoms in BCC ?

  1. 8
  2. 6
  3. 12
  4. 4

Correct answer: 1

Coordination number of atoms in BCC

Question 2

Composition of gun metal?

  1. 88 % Cu, 10 % Sn, 2 % Zn
  2. 80 % Cu, 10 % Sn, 10 % Zn
  3. 85 % Cu, 10 % Sn, 5 % Zn
  4. 90 % Cu, 8 % Sn, 2 % Zn

Correct answer: 1

Composition of gun metal JEE Mains 2021 question paper

Question 3

Anaerobic respiration causes:

  1. Global warming
  2. Acid rain
  3. Greenhouse effect
  4. None of these

Correct answer: 3

Anaerobic respiration causes

Question 4

Monomer of Buna-S and nylon-6, respectively are

  1. Styrene & caprolactam
  2. Cyclohexane & caprolactam
  3. Ethylene glycol & styrene
  4. Styrene & amino acid

Correct answer: 1

Monomer of Buna-S and nylon-6, respectively are JEE Mains 2021 question paper

Question 5

Why nitration of aniline gives 47 % meta product?

  1. Due to the formation of anilinium ion.
  2. Aniline is ortho/para directing.
  3. In acidic medium, aniline is converted into anilinium ion which is ortho/para directing.
  4. None of these.

Correct answer: 1

Why nitration of aniline gives 47 % meta product

Question 6

Which of the following ore is concentrated using group 1 cyanide?

  1. Sphalerite
  2. Malachite
  3. Calamine
  4. Siderite

Correct answer: 1

Which of the following ore is concentrated using group 1 cyanide JEE Mains 2021 question paper

Question 7

Compare the first Ionization Energy of Mg, Al, Si, P, S.

  1. P > S > Si > Mg > Al
  2. P < S < Si < Mg < Al
  3. P > S > Si > Al > Mg
  4. S > P > Si > Al > Mg

Correct answer: 1

Compare the first Ionization Energy of Mg, Al, Si, P, S

Question 8

An ore of tin containing FeCrO4 is concentrated by :

  1. Magnetic separation
  2. Electrolytic separation
  3. Hydraulic separation
  4. None of these

Correct answer: 1

An ore of tin containing FeCrO4 is concentrated by JEE Mains 2021 question paper

Question 9

The non-existence of PbI4 is due to its:

  1. Small size of Pb+4 and large size of I ion
  2. High oxidising power of Pb+4 ion
  3. High reducing power of I ion
  4. Both (b) and (c)

Correct answer: 4

The non-existence of PbI4 is due to its

Question 10

Helical structure of protein is formed by which bond?

  1. H-bond
  2. Peptide bond
  3. Dipeptide bond
  4. None of these

Correct answer: 1

Helical structure of protein is formed by which bond JEE Mains 2021 question paper

Question 11

JEE Mains 2021 question paper

1)

JEE Mains 2021 question paper

2)

JEE Mains 2021 question paper

3)

JEE Mains 2021 question paper

4)

JEE Mains 2021 question paper

Correct answer: 2

Question 12

Cu, Zn, Cr, Co

Which have +ve reduction potential values for M2+ (aq)/ M(s)

  1. Cu+2/Cu
  2. Zn+2/Zn
  3. Cr+2/Cr
  4. Co+2/Co

Correct answer: 1

Which have +ve reduction potential values for JEE Mains 2021 question paper

Question 13

JEE Mains 2021 question paper

1)

JEE Mains 2021 question paper

2)

JEE Mains 2021 question paper

3)

JEE Mains 2021 question paper

4)

JEE Mains 2021 question paper

Correct answer: 2

Question 14

JEE Mains 2021 question paper

As –OH group is activating in nature

∴ NO2 attacks at ortho and para position, but para position is already blocked.

∴ NO2 is only attached at ortho position w.r.t. OH group

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

Correct answer: 1

As –OH group is activating in nature JEE Mains 2021 question paper

Question 15

Rate of diffusion does not depend on:

  1. Size of molecule
  2. Concentration
  3. Temperature
  4. Mass of particle
Rate of diffusion does not depend on

Question 16

Bond angle in H2O?

  1. 104.5o
  2. 107.5o
  3. 109.28o
  4. None of these

Correct answer: 1

Bond angle in H2O JEE Mains 2021 question paper

Question 17

Which of the following oxides of nitrogen converts to another oxide on heating?

  1. NO
  2. N2O
  3. N2O4
  4. All of these

Correct answer: 3

Which of the following oxides of nitrogen converts to another oxide on heating

Question 18

Find the time period of reaction for 40 % completion of reaction.

Rate constant is 25 × 10-4 s-1

Correct answer: 202.60

Find the time period of reaction for 40 % completion of reaction JEE Mains 2021 question paper

Question 19

Substance given with molar mass = 90 g per mole. The weight given is: 4.5 g. Volume of solution = 250 ml. Find molarity.

Correct answer: 0.20

Substance given with molar mass = 90 g per mole. The weight given is: 4.5 g. Volume of solution = 250 ml. Find molarity

JEE Main Frequently Asked Questions (FAQs)

Question 1: When is JEE mains 2021 exams?

Answer: National Testing Agency has announced dates for all phases of JEE Mains. 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 Mains click here.

Question 2: Can I challenge JEE Mains 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 Mains 2021 Counseling?

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


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