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JEE Main & Advanced NSEC PYQs with solutions

Chapter-wise NSEC previous year questions for JEE Main & Advanced: 606 questions in 30 chapters. Largest chapters: Some Basic Concepts of Chemistry (60), Electrochemistry (52) and Thermodynamics (C) (50). Open any question for options, correct answer and solution.

606 questions30 chapters

JEE NSEC chapters

Some Basic Concepts of Chemistry

60 PYQs

Electrochemistry

52 PYQs

Thermodynamics (C)

50 PYQs

Structure of Atom

50 PYQs

General Organic Chemistry

44 PYQs

Chemical Kinetics

42 PYQs

Chemical Bonding and Molecular Structure

34 PYQs

Coordination Compounds

33 PYQs

Hydrocarbons

29 PYQs

Solid State

22 PYQs

Ionic Equilibrium

20 PYQs

Alcohols Phenols and Ethers

19 PYQs

Solutions

18 PYQs

Haloalkanes and Haloarenes

17 PYQs

States of Matter

14 PYQs

Amines

14 PYQs

d and f Block Elements

12 PYQs

Redox Reactions

11 PYQs

Chemical Equilibrium

11 PYQs

Classification of Elements and Periodicity in Properties

10 PYQs

Biomolecules

9 PYQs

Practical Chemistry

8 PYQs

Surface Chemistry

7 PYQs

General Principles and Processes of Isolation of Metals

6 PYQs

s Block Elements

5 PYQs

Polymers

3 PYQs

Carboxylic Acid Derivatives

3 PYQs

Chemistry in Everyday Life

1 PYQs

Environmental Chemistry

1 PYQs

Hydrogen

1 PYQs

Sample NSEC questions

1

At constant volume, 6.0 mol of H_2 gas at 0^ ^ ^ ∘ C and 100 kPa was heated to 250 kPa . The molar heat of H_2 at constant pressure (C_ P )=28.9 ~J ~mol^ -1 . ( assume that the

Olympiad workbook Solution View → 2

Hydrazine used in rocket fuels can be obtained by the reaction of ammonia and hydrogen peroxide according to the following equation 2 NH_3(~g)+H_2 O_2(l) arrow N_2 H_4(l)+2 H_2

Olympiad workbook Solution View → 3

The daily energy requirement of a teenager is 7800 kJ . As calculated from the data given in the table below, the amount of glucose he has to consume (g) per day assuming that the

Olympiad workbook Solution View → 4

If the radius of the hydrogen atom is 53 pm , the radius of the He^ + ion is close to

Olympiad workbook Solution View → 5

An electron present in the third excited state of a H atom returns to the first excited state and then to the ground state. If λ_1 and λ_2 are the wavelengths of light emitted in

Olympiad workbook Solution View → 6

The ratio of the energy of the electron in ground state of hydrogen atom to that of the electron in the first excited state of Be^ 3+ is

Olympiad workbook Solution View → 7

The crystal defect indicated in the diagram below is

Olympiad workbook Solution View → 8

The cubic unit cell of an oxide of metals A and B is as given below, in which oxygen, A and B are represented by open circles, crossed circles and dark circles respectively. The

Olympiad workbook Solution View → 9

Read carefully all the three statements on defects in solids: (i) In Frenkel defect, interstitial Ag^ + site is surrounded tetrahedrally by four Cl^ - ions and four Ag^ + ions

Olympiad workbook Solution View → 10

When 100 g each of the salts NaCl, MgSO_4, Ca(NO_3)_2, ~K_2 CO_3 , were dissolved separately in 1.0 kg of water, the solution with the highest boiling point will be of

Olympiad workbook Solution View → 11

About sea water, which of the following statement/s is/are correct? I. Frozen sea water melts at a lower temperature than pure ice II. Boiling point of sea water increases as it

Olympiad workbook Solution View → 12

A student intended to prepare 1000 mL of a 10 ppm solution of K^ + from KCl . He made appropriate calculations, weighed the salt accordingly and prepared the solution. However

Olympiad workbook Solution View → 13

NaOH solution is added dropwise to HCl solution and the conductance of the mixture is measured after addition of each drop. The variation of conductance with volume of NaOH added

Olympiad workbook Solution View → 14

Reaction E_0 / V Agarrow Ag^ + + ^ - -0.80 Cr^ 3+ +3 ^ - arrow 3 Cr -0.74 Zn^ 2+ +2 ^ - arrow Zn -0.76 I_2(~s)+2 ^ - arrow 2 I^ - 0.54 Co^ 2+ +2 ^ - arrow Co -0.28 Ni^ 2+ +2 ^

Olympiad workbook Solution View → 15

When a medal is electroplated with silver (Ag)

Olympiad workbook Solution View → 16

When excess KMnO_4 is added to concentrated H_2 SO_4 , an oily green colored covalent compound Y is formed. Which of the following statements is/ are true for the above reaction.

Olympiad workbook Solution View → 17

Which of the following statements is not true for Ce^ 3+ and Yb^ 3+ ?

Olympiad workbook Solution View → 18

An excess of aqueous ammonia is added to three different flasks ( F_1, F_2, F_3 ) containing aqueous solutions of CuSO_4, Fe_2(SO_4)_3 and NiSO_4 respectively. Which of the

Olympiad workbook Solution View → 19

For an elementary rearrangement reaction A leftharpoons P , the following data were recorded at 303 K , when [P]_0=0 : Set No. [A]_0 / molL^ -1 Rate of conversion of A/ molL^ -1 ^

Olympiad workbook Solution View → 20

The kinetic data recorded at 278 K for the reaction NH_4 ^ + (a q)+NO_2 ^ - (a q) arrow N_2(g)+2 H_2 O(I) is Set No. [NH_4^ + ] / M [NO_2^ - ] / M Rate of reaction/ M s-1 1 0.24

Olympiad workbook Solution View → 21

The reaction X+Y arrow Z is first order with respect to X and second order with respect to Y . The initial rate of formation of Z=R mol^ - dm^3 ^ -1 when [X]_0 and [Y]_0 are 0.40

Olympiad workbook Solution View → 22

A colorless water-soluble compound on strong heating liberates a brown colored gas and leaves a yellow residue that turns white on cooling. An aqueous solution of the original

Olympiad workbook Solution View → 23

Addition of dil. HCl to an aqueous solution of a mixture of two inorganic salts yielded white precipitate E and filtrate F . Precipitate E dissolved in hot water. F in alkaline

Olympiad workbook Solution View → 24

Passing H_2~S gas into a mixture of Mn^ 2+ , Ni^ 2+ , Cu^ 2+ and Hg^ 2+ in an acidified aqueous solution precipitates

Olympiad workbook Solution View → 25

Among the following, number of oxygen atoms present is the maximum in

Olympiad workbook Solution View → 26

Which of the following mixtures of water and H_2 SO_4 would have mass percentage of H_2 SO_4 close to 30 ?

Olympiad workbook Solution View → 27

A 500 mL glass flask is filled at 298 K and 1 atm . pressure with three diatomic gases X, Y and Z . The initial volume ratio of the gases before mixing was 5: 3: 1 . The density

Olympiad workbook Solution View → 28

In ammonia the bond angle is 107^ ^ ^ ∘ 48^ while in SbH_3 the bond angle is about 91^ ^ ^ ∘ 18^ . The correct explanation among the followings is/ are

Olympiad workbook Solution View → 29

Which of the following compounds contain 3-centered 2-electron bonding? (i) [BeF_2]_ n (ii) [Be(CH_3)_3]_ n (iii) [BeCl_2]_ n (iv) [BeH_2]_ n

Olympiad workbook Solution View → 30

In the Lewis structure of ozone (O_3) , the formal charge on the central oxygen atom is

Olympiad workbook Solution View → 31

How many isomers are possible for complex [Co(ox)_2 Cl_2]^ + ?

Olympiad workbook Solution View → 32

Which one of the following reactions is correct?

Olympiad workbook Solution View → 33

Which of the following statements about ammonium cerium(IV) nitrate, (NH_4)_2 [Ce(NO_3)_6] is false?

Olympiad workbook Solution View → 34

Equal masses of ethane and hydrogen gas are present in a container at 25^ ^ ^ ∘ C . The fraction of the total pressure exerted by ethane gas is

Olympiad workbook Solution View → 35

The van der Waals equation for one mole of a real gas can be written as (P+a / V^2)(V-b)=RT . For the gases H_2, NH_3 , and CH_4 , the value of ' a ' (. bar L^ -2 mol^ -2 ) are

Olympiad workbook Solution View → 36

Which of the following will not give a straight line plot for an ideal gas?

Olympiad workbook Solution View → 37

The pH of a 1.0 × 10^ -3 ~mol ~L^ -1 solution of a weak acid HA is 3.60 . The dissociation constant of the acid is

Olympiad workbook Solution View → 38

The solution with pH value close to 1 is

Olympiad workbook Solution View → 39

The colour changes of an indicator HIn in acid base titrations is given below Which of the following statements is correct?

Olympiad workbook Solution View → 40

Match the compounds given in list I with their characteristic reactions in list II List-I (Compound) List-II (Reaction) 1 Tertbutyl amine a Liberation of ammonia on heating with

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