Given below are two statements: Statement I: A second's pendulum has a time period of 1 second. Statement II: It takes precisely one second to move between the two extreme positions. In the light of the above statements, choose the correct answer from the options given below

Statement I is false but Statement II is true

Given below are two statements Statement I : An electric dipole is placed at the centre of a hollow sphere. The flux of electric field through the sphere is zero, but the electric field is not zero anywhere in the sphere. Statement II : If R is the radius of a solid metallic sphere and Q be the tota

Statement I is true but Statement II is false

Given below are two statements : one is labeled as Assertion A and the other is labeled as Reason R . Assertion A : For a simple microscope, the angular size of the object equals the angular size of the image. Reason R : Magnification is achieved as the small object can be kept much closer to the ey

Both A and R are true and R is the correct explanation of A

(a) → (iii), (b) → (iv), (c) → (i), (d) → (ii)

(a) → (iv), (b) → (iii), (c) → (i), (d) → (ii)

(a) → (iii), (b) → (v), (c) → (i), (d) → (iv)

(a) → (ii), (b) → (iv), (c) → (i), (d) → (iii)

(a) → (ii), (b) → (i), (c) → (iii)

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JEE Main 2021 February 26, Shift 2 Question Paper with Solutions

All 90 questions from the JEE Main 2021 (February 26, Shift 2) shift — Physics (30), Chemistry (30) and Mathematics (30) — each with the correct answer (answer key) and a step-by-step solution. Read it free online, or attempt the full paper as a timed mock test.

Physics PYQs 2021 Chemistry PYQs 2021 Mathematics PYQs 2021

Chemistry30 questions

Q31Single correctClassification of Elements and Periodicity in Properties

The correct order of electron gain enthalpy is:

(A)

S > O > Se > Te

(B)

O > S > Se > Te

(C)

S > Se > Te > O

(D)

Te > S > Se > O

Q32Single correctp-Block Elements

Which pair of oxides is acidic in nature?

(A)

B_{2} O_{3}, CaO

(B)

N_{2} O_{5}, BaO

(C)

CaO, SiO_{2}

(D)

B_{2} O_{3}, SiO_{2}

Q33Single correctp-Block Elements

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : In Tl

I_{3}

, isomorphous to Cs

I_{3}

, the metal is present in +1 oxidation state.
Reason R : Tl metal has fourteen f electrons in its electronic configuration.
In the light of the above statements, choose the most appropriate answer from the options given below:

(A)

A is correct but R is not correct

(B)

Both A and R are correct and R is the correct explanation of A

(C)

A is not correct but R is correct

(D)

Both A and R are correct but R is NOT the correct explanation of A

Q34Single correctChemical Bonding and Molecular Structure

Match List-I with List-II.

List-I	List-II
(a). $Ne_{2}$	(i). $1$
(b). $N_{2}$	(ii). $2$
(c). $F_{2}$	(iii). $0$
(d). $O_{2}$	(iv). $3$

(A)

(a)

\to

(ii), (b)

\to

(i), (c)

\to

(iv), (d)

\to

(iii)

(B)

(a)

\to

(iii), (b)

\to

(iv), (c)

\to

(i), (d)

\to

(ii)

(C)

(a)

\to

(i), (b)

\to

(ii), (c)

\to

(iii), (d)

\to

(iv)

(D)

(a)

\to

(iv), (b)

\to

(i), (c)

\to

(ii), (d)

\to

(iii)

Q35Single correctp-Block Elements

Calgon is used for water treatment. Which of the following statement is NOT true about Calgon?

(A)

It is polymeric compound and is water soluble.

(B)

Calgon contains the 2

^{nd}

most abundant element by weight in the Earth's crust.

(C)

It is also known as Graham's salt.

(D)

It doesn't remove C

a^{2 +}

ion by precipitation.

Q36Single correctAtomic Structure

Which of the following forms of hydrogen emits low energy

β^{-}

particles?

(A)

Deuterium_{1}^{2} H

(B)

Proton H^{+}

(C)

Tritium_{1}^{3} H

(D)

Protium_{1}^{1} H

Q37Single correctSome Basic Principles of Organic Chemistry

C 1 H_{2} = C 2 = C 3 H - C 4 H_{3}

molecule, the hybridization of carbon 1, 2, 3 and 4 respectively, are :

(A)

s p^{2}, s p^{3}, s p^{2}, s p^{3}

(B)

s p^{2}, s p, s p^{2}, s p^{3}

(C)

s p^{2}, s p^{2}, s p^{2}, s p^{3}

(D)

s p^{3}, s p, s p^{3}, s p^{3}

Q38Single correctSome Basic Concepts in Chemistry

The nature of charge on resulting colloidal particles when FeC

l_{3}

is added to excess of hot water is:

(A)

positive

(B)

sometimes positive and sometimes negative

(C)

neutral

(D)

negative

Q39Single correctd- and f-Block Elements

Match List-I with List-II.

List-I	List-II
(a). Sodium Carbonate	(i). Deacon
(b). Titanium	(ii). Castner-Kellner
(c). Chlorine	(iii). van-Arkel
(d). Sodium hydroxide	(iv). Solvay

(A)

(a)

\to

(i), (b)

\to

(iii), (c)

\to

(iv), (d)

\to

(ii)

(B)

(a)

\to

(iii), (b)

\to

(ii), (c)

\to

(i), (d)

\to

(iv)

(C)

(a)

\to

(iv), (b)

\to

(i), (c)

\to

(ii), (d)

\to

(iii)

(D)

(a)

\to

(iv), (b)

\to

(iii), (c)

\to

(i), (d)

\to

(ii)

Q40Single correctd- and f-Block Elements

Match List-I with List-II.

List-I	List-II
(a). Siderite	(i). Cu
(b). Calamine	(ii). Ca
(c). Malachite	(iii). Fe
(d). Cryolite	(iv). Al
	(v). Zn

(A)

(a)

\to

(iii), (b)

\to

(i), (c)

\to

(v), (d)

\to

(ii)

(B)

(a)

\to

(i), (b)

\to

(ii), (c)

\to

(v), (d)

\to

(iii)

(C)

(a)

\to

(iii), (b)

\to

(v), (c)

\to

(i), (d)

\to

(iv)

(D)

(a)

\to

(i), (b)

\to

(ii), (c)

\to

(iii), (d)

\to

(iv)

Q41Single correctOrganic Compounds Containing Halogens

Match List-I with List-II.

List-I	List-II
(a).	(i). Wurtz reaction
(b).	(ii). Sandmeyer reaction
(c). $2 CH_{3} CH_{2} Cl + 2 Na Ether C_{2} H_{5} - C_{2} H_{5} + 2 NaCl$	(iii). Fittig reaction
(d). $2 C_{6} H_{5} Cl + 2 Na Ether C_{6} H_{5} - C_{6} H_{5} + 2 NaCl$	(iv). Gatterman reaction

(A)

(a)

\to

(iii), (b)

\to

(iv), (c)

\to

(i), (d)

\to

(ii)

(B)

(a)

\to

(ii), (b)

\to

(i), (c)

\to

(iv), (d)

\to

(iii)

(C)

(a)

\to

(iii), (b)

\to

(i), (c)

\to

(iv), (d)

\to

(ii)

(D)

(a)

\to

(ii), (b)

\to

(iv), (c)

\to

(i), (d)

\to

(iii)

Q42Single correctOrganic Compounds Containing Halogens

Identify A in the given reaction.

Tetralin bearing a phenolic OH on the aromatic ring and an OH and a CH2OH on the saturated ring, treated with SOCl2 to give A (Major Product).

(A)

(B)

(C)

(D)

Q43Single correctHydrocarbons

Considering the above reaction, the major product among the following is:

A branched aliphatic ketone treated with 1) Zn/HCl then 2) Cr2O3, 773 K, 10-20 atm.

(A)

(B)

(C)

(D)

Q44Single correctOrganic Compounds Containing Oxygen

2, 4

-

DNP test can be used to identify :

(A)

aldehyde

(B)

amine

(C)

halogens

(D)

ether

Q45Single correctOrganic Compounds Containing Oxygen

Identify A in the given chemical reaction.

Benzene ring bearing two ortho -CH2CH2CHO chains, treated with NaOH, C2H5OH/H2O, heat to give A (Major Product) by intramolecular aldol.

(A)

(B)

(C)

(D)

Q46Single correctOrganic Compounds Containing Oxygen

Identify

A

in the following chemical reaction.

4-methoxybenzaldehyde treated with i) HCHO, NaOH; ii) CH3CH2Br, NaH, DMF; iii) HI, heat to give A.

(A)

(B)

(C)

(D)

Q47Single correctOrganic Compounds Containing Nitrogen

Ceric ammonium nitrate and

CHCl_{3}

/ alc. KOH are used for the identification of functional groups present in ___ and ___ respectively.

(A)

amine, phenol

(B)

alcohol, amine

(C)

amine, alcohol

(D)

alcohol, phenol

Q48Single correctOrganic Compounds Containing Nitrogen

A. Phenyl methanamine
B. N, N-Dimethylaniline
C. N-Methyl aniline
D. Benzenamine
Choose the correct order of basic nature of the above amines.

(A)

A > B > C > D

(B)

A > C > B > D

(C)

D > B > C > A

(D)

D > C > B > A

Q49Single correctBiomolecules

Match List-I with List-II.

List-I	List-II
(a). Sucrose	(i). $β - D - Galactose and β - D - Glucose$
(b). Lactose	(ii). $α - D - Glucose and β - D - Fructose$
(c). Maltose	(iii). $α - D - Glucose and α - D - Glucose$

(A)

(a) \to (iii), (b) \to (ii), (c) \to (i)

(B)

(a) \to (iii), (b) \to (i), (c) \to (ii)

(C)

(a) \to (ii), (b) \to (i), (c) \to (iii)

(D)

(a) \to (i), (b) \to (iii), (c) \to (ii)

Q50Single correctBiomolecules

Seliwanoff test and Xanthoproteic test are used for the identification of ___ and ___ respectively.

(A)

aldoses, ketoses

(B)

ketoses, proteins

(C)

proteins, ketoses

(D)

ketoses, aldoses

Q51NumericalSome Basic Concepts in Chemistry

The

NaNO_{3}

weighed out to make 50 mL of an aqueous solution containing 70.0 mg

Na^{+}

per mL

i s_{g}

. (Rounded off to the nearest integer) [Given : Atomic weight in

gmol^{- 1}

-

Na : 23; N : 14; O : 16]

Q52NumericalAtomic Structure

A ball weighing 10 g is moving with a velocity of 90

m s^{- 1}

. If the uncertainty in its velocity is 5%, then the uncertainty in its position is _

\times 1 0^{- 33}

m. (Rounded off to the nearest integer) [Given:

h = 6.63 \times 1 0^{- 34}

Js]

Q53NumericalChemical Thermodynamics

The average

S - F

bond energy in kJ

mol^{- 1}

SF_{6}

is _. (Rounded off to the nearest integer) [Given : The values of standard enthalpy of formation of

SF_{6} (g)

S (g)

and

F (g)

are

- 1100

, 275 and 80 kJ

mol^{- 1}

respectively.]

Q54NumericalEquilibrium

The pH of ammonium phosphate solution, if

pk_{a}

of phosphoric acid and

pk_{b}

of ammonium hydroxide are 5.23 and 4.75 respectively, is

Q55NumericalRedox Reactions and Electrochemistry

In mildly alkaline medium, thiosulphate ion is oxidized by

MnO_{4}^{-}

to "

A

". The oxidation state of sulphur in "

A

" is_

Q56NumericalSome Basic Concepts in Chemistry

The number of octahedral voids per lattice site in a lattice is_. (Rounded off to the nearest integer)

Q57NumericalSolutions

When 12.2 g of benzoic acid is dissolved in 100 g of water, the freezing point of solution was found to be

- 0.93^{\circ} C

(

K_{f} (H_{2} O) = 1.86

K kg

mol^{- 1}

). The number (n) of benzoic acid molecules associated (assuming 100% association) is _.

Q58NumericalRedox Reactions and Electrochemistry

Emf of the following cell at 298 K in V is

x \times 1 0^{- 2}

Zn ∣ Zn^{2 +} (0.1 M)∥ Ag^{+} (0.01 M) ∣ Ag

The value of x is _ (Rounded off to the nearest integer)
[Given :

E_{Zn^{2 +} / Zn}^{θ} = - 0.76

E_{Ag^{+} / Ag}^{θ} = + 0.80

\frac{2.303 RT}{F} = 0.059

]

Q59NumericalChemical Kinetics

If the activation energy of a reaction is 80.9 kJ

mol^{- 1}

, the fraction of molecules at 700 K, having enough energy to react to form products is

e^{- x}

. The value of x is (Rounded off to the nearest integer) [Use

R = 8.31

K^{- 1}

mol^{- 1}

]

Q60NumericalCoordination Compounds

The number of stereo isomers possible for

[Co (ox)_{2} (Br) (NH_{3})]^{2 -}

is _. [ox = oxalate]

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Frequently Asked Questions

How many questions are in the JEE Main 2021 February 26, Shift 2 paper?

The JEE Main 2021 February 26, Shift 2 paper has 90 questions — Physics (30), Chemistry (30) and Mathematics (30). Every question is on this page with its correct answer and a step-by-step solution.

What is the marking scheme for JEE Main?

JEE Main awards +4 marks for each correct answer and −1 for a wrong answer, with 0 for questions left unattempted. The paper covers Physics, Chemistry and Mathematics.

Are the answer key and step-by-step solutions provided for the 2021 February 26, Shift 2 paper?

Yes — every question shows the correct answer (answer key) and a detailed step-by-step solution, free to read online.

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JEE Main 2021 February 26, Shift 2 Question Paper with Solutions

Physics30 questions

Chemistry30 questions

Mathematics30 questions

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