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JEE Main & Advanced NSEC PYQs with solutions

Chapter-wise NSEC previous year questions for JEE Main & Advanced. Open any question for options, correct answer and solution.

606 questions30 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

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 heat cap

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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 ) N ₂ H ₄( l )+2 H ₂ O

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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

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

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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 ₁ and ₂ are the wavelengths of light emitted in these

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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

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The crystal defect indicated in the diagram below is

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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 fo

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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, where

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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

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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 ev

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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, afte

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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 i

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Reaction E ₀ / V Ag Ag ⁺+ e ⁻ -0.80 Cr ³⁺+3 e ⁻ 3 Cr -0.74 Zn ²⁺+2 e ⁻ Zn -0.76 I ₂( ~s )+2 e ⁻ 2 I ⁻ 0.54 Co ²⁺+2 e ⁻ Co -0.28 Ni ²⁺+2 e ⁻ Ni -0.26 The best reducing agent among t

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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.

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

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An excess of aqueous ammonia is added to three different flasks ( F₁, F₂, F₃ ) containing aqueous solutions of CuSO ₄, Fe ₂ ( SO ₄ )₃ and NiSO ₄ respectively. Which of the followin

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For an elementary rearrangement reaction A P , the following data were recorded at 303 K , when [ P ]₀=0 : Set No. [ A ]₀ / mol L ⁻¹ Rate of conversion of A / mol L ⁻¹ ⁻¹ 1 0.340 0

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The kinetic data recorded at 278 K for the reaction NH ₄ ⁺(a q)+ NO ₂ ⁻(a q) 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 0.10 7.2 10⁻⁶

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The reaction X + Y 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 sec ⁻¹ when [ X ]₀ and [ Y ]₀ are 0.40

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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 soli

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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 ali

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

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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 of

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

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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

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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 aq

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