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JEE Some Basic Concepts of Chemistry PYQs with Solutions

432 previous year questions from Some Basic Concepts of Chemistry (JEE Main & Advanced Chemistry) with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

432 questionsChemistry2005–2026Answers + solutions

About Some Basic Concepts of Chemistry PYQs

Some Basic Concepts of Chemistry has 432 previous year questions in the Quantrex Academy JEE Main & Advanced Chemistry bank. The 220 questions in this list come from JEE Main (199) and JEE Advanced (21), spanning 2005 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

Questions by year (this list)

  • 2026: 14
  • 2025: 25
  • 2024: 18
  • 2023: 20
  • 2022: 31
  • 2021: 30
  • 2020: 15
  • 2019: 13
  • 2018: 8
  • 2017: 4
  • 2016: 4
  • 2015: 5

Some Basic Concepts of Chemistry questions with solutions

1

Match List-I with List-II. List-I Mass of substance List-II Number of atoms A. 1.8 mg water I. 2× 10^ -4 × N_A B. 9.8 mg sulphuric acid II. 1.5× 10^ -4 × N_A C. 1.8 mg carbon III.

JEE Main 2026 Solution View → 2

Which of the following contain the same number of atoms ? (Given : Molar mass in g mol ^ -1 of H, He, O and S are 1, 4, 16 and 32 respectively) A. 2 g of O _2 gas B. 4 g of SO _2

JEE Main 2026 Solution View → 3

An oxide of iron contains 69.9\% iron, its empirical formula, is: (Given: Molar mass of Fe and O are 56 and 16 g mol ^ -1 respectively.)

JEE Main 2026 Solution View → 4

What volume of hydrogen gas at STP would be liberated by action of 50 mL of H_2SO_4 of 50\% purity (density = 1.3 g mL^ -1 ) on 20 g of zinc ? Given : Molar mass of H, O, S, Zn

JEE Main 2026 Solution View → 5

How many grams of residue is obtained by heating 2.76 g of silver carbonate? (Given: Molar mass of C, O and Ag are 12 , 16 and 108 g mol ^ -1 respectively)

JEE Main 2026 Solution View → 6

The correct order of total number of atoms present in (A) 2 moles of cyclohexane (B) 684 g of sucrose (C) 90.8 L of dihydrogen at STP is:

JEE Main 2026 Solution View → 7

Number of moles and number of molecules in 1.4187 L of SO_2 at STP respectively are:

JEE Main 2026 Solution View → 8

The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1 . It has two carbon atoms. The weight (in g) of CO_2(g) formed when 3.38 g of this hydrocarbon is completely

JEE Main 2026 Solution View → 9

For the given reaction: CaCO_ 3 +2 HCl CaCl_ 2 +H_ 2 O+CO_ 2 If 90 ~g CaCO_ 3 is added to 300 mL of HCl which contains 38.55 \% HCl by mass and has density 1.13 ~g ~mL^ -1 , then

JEE Main 2026 Solution View → 10

A+2 ~B AB_ 2 36.0 g of 'A' (Molar mass: 60 ~g ~mol^ -1 ) and 56.0 g of ' B^ (Molar mass: 80 ~g ~mol^ -1 ) are allowed to react. Which of the following statements are correct ? A.

JEE Main 2026 Solution View → 11

In the reaction, 2 Al(s)+6 HCl(aq) arrow 2 Al^ 3+ (aq)+6 Cl^ - (aq)+3 H_ 2 (~g)

JEE Main 2026 Solution View → 12

Aqueous HCl reacts with MnO_ 2 (~s) to form MnCl_ 2 (aq), Cl_ 2 (~g) and H_ 2 O(l) . What is the weight (in g) of Cl_ 2 liberated when 8.7 g of MnO_ 2 (~s) is reacted with excess

JEE Main 2026 Solution View → 13

14.0 g of calcium metal is allowed to react with excess HCl at 1.0 atm pressure and 273 K. Which of the following statements is incorrect? [Given : Molar mass in g mol^ -1 of

JEE Main 2026 Solution View → 14

80 mL of a hydrocarbon on mixing with 264 mL of oxygen in a closed U-tube undergoes complete combustion. The residual gases after cooling to 273 K occupy 224 mL. When the system

JEE Main 2026 Solution View → 15

20 mL of sodium iodide solution gave 4.74 g silver iodide when treated with excess of silver nitrate solution. The molarity of the sodium iodide solution is ________ M. (Nearest

JEE Main 2025 Solution View → 16

On combustion 0.210 g of an orgainc compound containing C, H and O gave 0.127 ~g H_2 O and 0.307 g CO_2 . The percentages of hydrogen and oxygen in the given organic compound

JEE Main 2025 Solution View → 17

Butane reacts with oxygen to produce carbon dioxide and water following the equation given below C_4 H_ 10 (~g)+(13)/(2) O_2(~g) arrow 4 CO_2(~g)+5 H_2 O(l) If 174.0 kg of butane

JEE Main 2025 Solution View → 18

An organic compound weighing 500 mg , produced 220 mg of CO_2 . on complete combustion. The percentage composition of carbon in the compound is _____ \%. (nearest integer) (Given

JEE Main 2025 Solution View → 19

The amount of calcium oxide produced on heating 150 kg limestone ( 75 \% pure) is ______ kg. (Nearest integer) Given : Molar mass (in g mol^ -1 ) of Ca-40, O-16, C-12

JEE Main 2025 Solution View → 20

Fortification of food with iron is done using FeSO_4 · 7 H_2 O . The mass in grams of the FeSO_4 · 7 H_2 O required to achieve 12 ppm of iron in 150 kg of wheat is ____ (Nearest

JEE Main 2025 Solution View → 21

Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is Given : Molar mass of Mg is 24 ~g ~mol^ -1 .

JEE Main 2025 Solution View → 22

Among 10^ -9 ~g (each) of the following elements, which one will have the highest number of atoms? Element : Pb, Po, Pr and Pt

JEE Main 2025 Solution View → 23

Consider the above sequence of reactions. 151 g of 2-bromopentane is made to react. Yield of major product P is 80 \% whereas Q is 100 \% . Mass of product Q obtained is ____ g.

JEE Main 2025 Solution View → 24

0.1 mol of the following given antiviral compound \(( P) \) will weigh ________ \( × 10^ -1 ~g \) (Given : molar mass in \( g mol^ -1 H : 1, C : 12, ~N : 14\), \( O : 16, ~F : 19

JEE Main 2025 Solution View → 25

\( CaCO _ 3 ( ~s)+2 HCl(aq) arrow CaCl _ 2 ( aq)+CO _ 2 ( ~g) H _ 2 O(l) \) Consider the above reaction, what mass of \( CaCl _ 2 \) will be formed if 250 mL of 0.76 M HCl reacts

JEE Main 2025 Solution View → 26

On complete combustion 1.0 g of an organic compound (X) gave 1.46 g of \( CO _ 2 \) and 0.567 g of \( H _ 2 O \). The empirical formula mass of compound \(( X) \) is ________ g.

JEE Main 2025 Solution View → 27

Choose the correct statements. (A) Weight of a substance is the amount of matter present in it. (B) Mass is the force exerted by gravity on an object. (C) Volume is the amount of

JEE Main 2025 Solution View → 28

Concentrated nitric acid is labelled as 75 \% by mass. The volume in mL of the solution which contains 30 g of nitric acid is ____. Given : Density of nitric acid solution is 1.25

JEE Main 2025 Solution View → 29

The molarity of a 70 \% (mass / mass) aqueous solution of a monobasic acid (X) is __________ × 10^ -1 M(Nearest integer) [Given: Density of aqueous solution of (X) is 1.25 ~g ~mL^

JEE Main 2025 Solution View → 30

Quantitative analysis of an organic compound (X) shows following % composition. C : 14.5 \% Cl : 64.46% H: 1.8 % (Empirical formula mass of the compound (X) is __________ × 10^ -1

JEE Main 2025 Solution View → 31

The elemental composition of a compound is 54.2 \% C, 9.2 \% H and 36.6 \% O . If the molar mass of the compound is 132 ~g ~mol^ -1 , the molecular formula of the compound is

JEE Main 2025 Solution View → 32

The hydrocarbon (X) with molar mass 80 ~g ~mol^ -1 and 90 \% carbon has …… degree of unsaturation.

JEE Main 2025 Solution View → 33

Xg of benzoic acid on reaction with aq NaHCO_3 released CO_2 that occupied 11.2 L volume at STP. X is _____ g.

JEE Main 2025 Solution View → 34

Consider the following reaction occurring in the blast furnace: Fe_3 O_ 4(~s) +4 CO_ (g) arrow 3 Fe_ (l) +4 CO_ 2(~g) ' x ' kg of iron is produced when 2.32 × 10^3 ~kg Fe_3 O_4

JEE Main 2025 Solution View → 35

0.01 mole of an organic compound (X) containing 10 \% hydrogen, on complete combustion produced 0.9 ~g H_2 O . Molar mass of (X) is _____ g mol^ -1 .

JEE Main 2025 Solution View → 36

When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is_______ - (Nearest integer) Given : Molar mass of Al is

JEE Main 2025 Solution View → 37

2.8 × 10^ -3 ~mol of CO_2 is left after removing 10^ 21 molecules from its ' x ' mg sample. The mass of CO_2 taken initially is Given: N_ A =6.02 × 10^ 23 ~mol^ -1

JEE Main 2025 Solution View → 38

Density of 3 M NaCl solution is 1.25 ~g / mL . The molality of the solution is :

JEE Main 2025 Solution View → 39

20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is _______ × 10^ -2 M . (Nearest integer)

JEE Main 2025 Solution View → 40

To form a complete monolayer of acetic acid on 1 ~g of charcoal, 100 ~mL of 0.5 M acetic acid was used. Some of the acetic acid remained unadsorbed. To neutralize the unadsorbed

JEE Advanced 2024 Solution View → 41

Molarity \((M)\) of an aqueous solution containing \(x ~g\) of anhyd. \(CuSO_4\) in \(500 ~mL\) solution at \(32 ^ ∘ C\) is \(2 × 10^ -1 M\). Its molality will be ______ \(× 10^

JEE Main 2024 Solution View → 42

Combustion of glucose \((C_6 H_ 12 O_6)\) produces \(CO_2\) and water. The amount of oxygen (in g) required for the complete combustion of \(900 ~g\) of glucose is : [Molar mass

JEE Main 2024 Solution View → 43

Molality ( \( m \) ) of \(3 M \) aqueous solution of \( NaCl \) is : (Given : Density of solution \(=1.25 ~g ~mL^ -1 \), Molar mass in \( g mol^ -1 : Na- 23, Cl- 35.5\))

JEE Main 2024 Solution View → 44

The density of ' \(x\) ' \( M \) solution (' \(X\) ' molar) of \( NaOH \) is \(1.12 ~g ~mL^ -1 \), while in molality, the concentration of the solution is \(3 ~m( 3 molal) \).

JEE Main 2024 Solution View → 45

The number of moles of methane required to produce \(11 ~g CO_2(~g)\) after complete combustion is : (Given molar mass of methane in \(g mol^ -1 : 16\))

JEE Main 2024 Solution View → 46

An organic compound has \(42.1 \%\) carbon, \(6.4 \%\) hydrogen and remainder is oxygen. If its molecular weight is 342, then its molecular formula is :

JEE Main 2024 Solution View → 47

\(9.3 ~g \) of pure aniline is treated with bromine water at room temperature to give a white precipitate of the product ' \( P \) '. The mass of product ' \( P \) ' obtaind is

JEE Main 2024 Solution View → 48

10mL of gaseous hydrocarbon on combustion gives 40mL of CO _ 2 (g) and 50mL of water vapour. Total number of carbon and hydrogen atoms in the hydrocarbon is _______.

JEE Main 2024 Solution View → 49

Consider the following reaction: 3 PbCl _ 2 + 2 ( NH _ 4 ) _ 3 PO _ 4 → Pb _ 3 ( PO _ 4 ) _ 2 + 6 NH _ 4 Cl If 72mmol PbCl _ 2 is mixed with 50mmol of ( NH _ 4 ) _ 3 PO _ 4 , then

JEE Main 2024 Solution View → 50

A sample of CaCO _ 3 and MgCO _ 3 weighed 2 .21 g is ignited to constant weight of 1 .152 g . The composition of the mixture is: (Given molar mass in g mol ^ - 1 , CaCO _ 3 : 100

JEE Main 2024 Solution View → 51

The molarity of 1L orthophosphoric acid ( H _ 3 PO _ 4 ) having 70 % purity by weight (specific gravity 1 .54 g cm ^ - 3 ) is ______ M . (Molar mass of H _ 3 PO _ 4 = 98g mol ^

JEE Main 2024 Solution View → 52

Number of moles of methane required to produce 22g CO _ 2 ( g ) after combustion is x × 10 ^ – 2 moles. The value of x is

JEE Main 2024 Solution View → 53

0 . 05cm thick coating of silver is deposited on a plate of 0 . 05 m ^ 2 area. The number of silver atoms deposited on plate are _______ × 10 ^ 23 . (At mass Ag = 108, d = 7 . 9g

JEE Main 2024 Solution View → 54

Volume of 3MNaOH (formula weight 40g mol ^ - 1 ) which can be prepared from 84g of NaOH is ____ × 10 ^ - 1 dm ^ 3 .

JEE Main 2024 Solution View → 55

9 . 3g of aniline is subjected to reaction with excess of acetic anhydride to prepare acetanilide. The mass of acetanilide produced if the reaction is 100 % completed is _____ ×

JEE Main 2024 Solution View → 56

1 mole of PbS is oxidised by X moles of O _ 3 to get Y moles of O _ 2 . X + Y =

JEE Main 2024 Solution View → 57

Mass of methane required to produce 22g of CO after complete combustion is g. (Given Molar mass in g mol -1 , C = 12 . 0 , H = 1 . 0 , O = 16 . 0 )

JEE Main 2024 Solution View → 58

1g of a carbonate ( M _ 2 CO _ 3 ) on treatment with excess HCl produces 0 . 01mol of CO _ 2 . The molar mass of M _ 2 CO _ 3 is gmol ^ - 1 . (Nearest integer)

JEE Main 2023 Solution View → 59

An organic compound gives 0 . 220g of CO _ 2 and 0 . 126g of H _ 2 O on complete combustion. If the % of carbon is 24 then the % of hydrogen is _________ × 10 ^ – 1 . (Nearest

JEE Main 2023 Solution View → 60

A metal chloride contains 55 . 0 % of chlorine by weight. 100mL vapours of the metal chloride at STP weigh 0 . 57g . The molecular formula of the metal chloride is (Given: Atomic

JEE Main 2023 Solution View → 61

A solution is prepared by adding 2g of ' ' X '' to 1 mole of water. Mass percent of '' X '' in solution is

JEE Main 2023 Solution View → 62

The volume of hydrogen liberated at STP by treating 2 . 4g of magnesium with excess of hydrochloric acid is ...... × 10 ^ - 2 L . Given Molar volume of gas is 22 . 4L at STP.

JEE Main 2023 Solution View → 63

25mL of silver nitrate solution ( 1M ) is added dropwise to 25mL of potassium iodide ( 1 . 05M ) solution. The ion(s) present in very small quantity in the solution is/are

JEE Main 2023 Solution View → 64

A solution of sugar is obtained by mixing 200g of its 25 % solution and 500g of its 40 % solution (both by mass). The mass percentage of the resulting sugar solution is _______

JEE Main 2023 Solution View → 65

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R . Assertion A : 3 . 1500g of hydrated oxalic acid dissolved in water to make

JEE Main 2023 Solution View → 66

Match List-I with List-II List-I List-II A 16g of CH _ 4 ( g ) I Weighs 28g B 1g of H _ 2 ( g ) II 60 . 2 × 10 ^ 23 electrons C 1mole of N _ 2 ( g ) III Weighs 32g D 0 . 5mol of

JEE Main 2023 Solution View → 67

The number of molecules and moles in 2 . 8375 litres of O _ 2 at STP are respectively

JEE Main 2023 Solution View → 68

Which of the following have same number of significant figures? (A) 0 . 00253 (B) 1 . 0003 (C) 15 . 0 (D) 163 Choose the correct answer from the options given below

JEE Main 2023 Solution View → 69

0 . 5g of an organic compound (X) with 60 % carbon will produce × 10 ^ - 1 g of CO _ 2 on complete combustion.

JEE Main 2023 Solution View → 70

If 5 moles of BaCl _ 2 is mixed with 2 moles of Na _ 3 PO _ 4 , the maximum number of moles of Ba _ 3 ( PO _ 4 ) _ 2 formed is _________ (Nearest integer)

JEE Main 2023 Solution View → 71

The molality of a 10 % ( v / V ) solution of di-bromine solution in CCl _ 4 (carbon tetrachloride) is x '. x = _____ × 10 ^ - 2 M . (Nearest integer) [Given : molar mass of Br

JEE Main 2023 Solution View → 72

The density of 3M solution of NaCl is 1 . 0g mL ^ - 1 . Molality of the solution is ______ × 10 ^ - 2 m (Nearest integer). Given: Molar mass of Na and Cl is 23 and 35 . 5g mol ^

JEE Main 2023 Solution View → 73

When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular formula of A ?

JEE Main 2023 Solution View → 74

Assume carbon burns according to following equation : 2C ( s ) + O _ 2 ( g ) → 2CO(s) when 12g carbon is burnt in 48g of oxygen, the volume of carbon monoxide produced is ______ ×

JEE Main 2023 Solution View → 75

On complete combustion, 0 . 492g of an organic compound gave 0 . 792g of CO _ 2 . The % of carbon in the organic compound is (Nearest integer)

JEE Main 2023 Solution View → 76

Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. The volume of hydrogen gas produced at STP from the reaction of 11 . 5g of zinc with excess HCl is L

JEE Main 2023 Solution View → 77

Number of hydrogen atoms per molecule of a hydrocarbon A having 85 . 8 % carbon is (Given : Molar mass of A = 84g mol ^ - 1 )

JEE Main 2023 Solution View → 78

To check the principle of multiple proportions, a series of pure binary compounds ( P _ m Q _ n ) were analysed and their composition is tabulated below. The correct option(s)

JEE Advanced 2022 Solution View → 79

The treatment of an aqueous solution of 3 . 74g of Cu ( NO _ 3 ) _ 2 with excess KI results in a brown solution along with the formation of a precipitate. Passing H _ 2 S through

JEE Advanced 2022 Solution View → 80

Consider the reaction 4 HNO _ 3 (l) + 3KCl(s) → Cl _ 2 (g) + NOCl(g) + 2 H _ 2 O(g) + 3 KNO _ 3 (s) The amount of HNO _ 3 required to produce 110 . 0g of KNO _ 3 is (Given

JEE Main 2022 Solution View → 81

C(s) + O _ 2 (g) → CO _ 2 (g) + 400kJ C(s) + (1)/(2) O _ 2 (g) → CO(g) + 100kJ When coal of purity 60 % is allowed to burn in presence of insufficient oxygen, 60 % of carbon is

JEE Main 2022 Solution View → 82

A 1 . 84mg sample of polyhydric alcoholic compound ' X ' of molar mass 92 . 0g / mol gave 1 . 344mL of H _ 2 gas at STP. The number of alcoholic hydrogen present in

JEE Main 2022 Solution View → 83

N _ 2(g) + 3 H _ 2(g) ⇌ 2 NH _ 3(g) 20g5g Consider the above reaction. If 20 g of dinitrogen reacts with 5 g of dihydrogen, then the limiting reagent of the reaction and number of

JEE Main 2022 Solution View → 84

2L of 0 . 2 MH _ 2 SO _ 4 is reacted with 2L of 0 . 1MNaOH solution, the molarity of the resulting product Na _ 2 SO _ 4 in the solution is____millimolar.

JEE Main 2022 Solution View → 85

In the given reaction, X + Y + 3Z ⇄ XYZ _ 3 if one mole of each of X and Y with 0 . 05mol of Z gives compound XYZ _ 3 . (Given : Atomic masses of X, Y and Z are 10,20 and 30amu

JEE Main 2022 Solution View → 86

On complete combustion of 0 . 492g of an organic compound containing C, H and O, 0 . 7938g of CO _ 2 and 0 . 4428g of H _ 2 O was produced. The % composition of oxygen in the

JEE Main 2022 Solution View → 87

​​​​​​​ In the above reaction, 5g of toluene is converted into benzaldehyde with 92 % yield. The amount of benzaldehyde produced is____ × 10 ^ - 2 g

JEE Main 2022 Solution View → 88

250g solution of D -glucose in water contains 10 . 8 % of carbon by weight. The molality of the solution is nearest to (Given: Atomic Weights are H = 1u; C = 12u; O = 16u )

JEE Main 2022 Solution View → 89

Hemoglobin contains 0 . 34 % of iron by mass. The number of Fe atoms in 3 . 3g of hemoglobin is (Given : Atomic mass of Fe is 56u, N _ A in 6 . 022 × 10 ^ 23 mol ^ - 1 )

JEE Main 2022 Solution View → 90

Chlorophyll extracted from the crushed green leaves was dissolved in water to make 2L solution of Mg of concentration 48 ppm . The number of atoms of Mg in this solution is x × 10

JEE Main 2022 Solution View → 91

When 800mL of 0 . 5M nitric acid is heated in a beaker, its volume is reduced to half and 11 . 5g of nitric acid is evaporated. The molarity of the remaining nitric acid solution

JEE Main 2022 Solution View → 92

56 . 0L of nitrogen gas is mixed with excess of hydrogen gas and it is found that 20L of ammonia gas is produced, The volume of unused nitrogen gas is found to be_____ L .

JEE Main 2022 Solution View → 93

SO _ 2 Cl _ 2 on reaction with excess of water results into acidic mixture SO _ 2 Cl _ 2 + 2 H _ 2 O → H _ 2 SO _ 4 + 2HCl 16 moles of NaOH is required for the complete

JEE Main 2022 Solution View → 94

Using the rules for significant figures, the correct answer for the expression (0 . 02858 × 0 . 112)/(0 . 5702) will be:

JEE Main 2022 Solution View → 95

Production of iron in blast furnace follows the following equation Fe _ 3 O _ 4 (s) + 4CO(g) → 3Fe(l) + 4 CO _ 2 (g) when 4 . 640kg of Fe _ 3 O _ 4 and 2 . 520kg of CO are allowed

JEE Main 2022 Solution View → 96

Compound A contains 8 . 7 % Hydrogen, 74 % Carbon and 17 . 3 % Nitrogen. The molecular formula of the compound is, Given : Atomic masses of C, H and N are 12, 1 and 14 amu

JEE Main 2022 Solution View → 97

The complete combustion of 0 . 492g of an organic compound containing ' C ', ' H ' and ' O ' gives 0 . 793g of CO _ 2 and 0 . 442g of H _ 2 O . The

JEE Main 2022 Solution View → 98

116g of a substance upon dissociation reaction, yields 7 . 5g of hydrogen, 60g of oxygen and 48 . 5g of carbon. Given that the atomic masses of H, O and C are 1, 16 and 12

JEE Main 2022 Solution View → 99

CNG is an important transportation fuel. When 100gCNG is mixed with 208g oxygen in vehicles, it leads to the formation of CO _ 2 and H _ 2 O and produces large quantity of heat

JEE Main 2022 Solution View → 100

The moles of methane required to produce 81g of water after complete combustion is____ × 10 ^ - 2 mol . [nearest integer]

JEE Main 2022 Solution View → 101

A commercially sold conc. HCl is 35 % HCl by mass. If the density of this commercial acid is 1 . 46g / mL , the molarity of this solution is : (Atomic mass : Cl = 35 . 5amu, H =

JEE Main 2022 Solution View → 102

On complete combustion 0 . 30g of an organic compound gave 0 . 20g of carbon dioxide and 0 . 10g of water. The percentage of carbon in the given organic compound is____(Nearest

JEE Main 2022 Solution View → 103

A protein ' A ' contains 0 . 30 % of glycine (molecular weight 75 ). The minimum molar mass of the protein ' A ' is____ × 10 ^ 3 g mol ^ - 1 [nearest integer]

JEE Main 2022 Solution View → 104

The number of N atoms in 681g of C _ 7 H _ 5 N _ 3 O _ 6 is x × 10 ^ 21 . The value of x is ( N _ A = 6 . 02 × 10 ^ 23 mol ^ - 1 ) (Nearest Integer)

JEE Main 2022 Solution View → 105

1L aqueous solution of H _ 2 SO _ 4 contains 0 . 02mmol H _ 2 SO _ 4 . 50 % of this solution is diluted with deionized water to give 1L solution (A) . In solution (A) , 0 . 01mmol

JEE Main 2022 Solution View → 106

Number of grams of bromine that will completely react with 5 . 0g of pent- 1 -ene is____ × 10 ^ - 2 g . (Atomic mass of Br = 80g / mol ) [Nearest integer]

JEE Main 2022 Solution View → 107

120g of an organic compound which contains only carbon and hydrogen on complete combustion gives 330g of CO _ 2 and 270g of water. The percentage of carbon and hydrogen in the

JEE Main 2022 Solution View → 108

If a rocket runs on a fuel ( C _ 15 H _ 30 ) and liquid oxygen, the weight of oxygen required and CO _ 2 released for every litre of fuel respectively are : (Given : density of

JEE Main 2022 Solution View → 109

Reaction of x g of Sn with HCl quantitatively produced a salt. Entire amount of the salt reacted with y g of nitrobenzene in the presence of required amount of HCl to produce 1.29

JEE Advanced 2021 Solution View → 110

Reaction of x g of Sn with HCl quantitatively produced a salt. Entire amount of the salt reacted with y g of nitrobenzene in the presence of required amount of HCl to produce 1.29

JEE Advanced 2021 Solution View → 111

For the following reaction scheme, percentage yields are given along the arrow: x g and y g are mass of R and U , respectively. (Use: Molar mass (in g mol^ -1 ) of H, C and O as

JEE Advanced 2021 Solution View → 112

For the following reaction scheme, percentage yields are given along the arrow: x g and y g are mass of R and U , respectively. (Use: Molar mass (in g mol^ -1 ) of H, C and O as

JEE Advanced 2021 Solution View → 113

The number of atoms in 8g of sodium is x × 10 ^ 23 . The value of x is _____ . (Nearest integer) [Given : N _ A = 6 . 02 × 10 ^ 23 mol ^ - 1 Atomic mass ofNa = 23 . 0u ]

JEE Main 2021 Solution View → 114

100g of propane is completely reacted with 1000g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x × 10 ^ - 2 . The value of x is (Nearest integer)

JEE Main 2021 Solution View → 115

The reaction that occurs in a breath analyser, a device used to determine the alcohol level in a person's blood stream is 2 K _ 2 Cr _ 2 O _ 7 + 8 H _ 2 SO _ 4 + 3 C _ 2 H _ 6

JEE Main 2021 Solution View → 116

100mL of Na _ 3 PO _ 4 solution contains 3 . 45g of sodium. The molarity of the solution is ..... × 10 ^ - 2 mol L ^ - 1 . (Nearest integer) [Atomic Masses - Na: 23 . 0u, O: 16 .

JEE Main 2021 Solution View → 117

An aqueous KCl solution of density 1 . 20g mL ^ - 1 has a molality of 3 . 30mol kg ^ - 1 . The molarity of the solution in molL ^ - 1 is____.(The Nearest integer) [ Molar mass of

JEE Main 2021 Solution View → 118

2 SO _ 2 ( g ) + O _ 2 ( g ) → 2 SO _ 3 ( g ) The above reaction is carried out in a vessel starting with partial pressure P _ SO _ 2 = 250mbar , P _ O _ 2 = 750mbar and P _ SO _

JEE Main 2021 Solution View → 119

The density of NaOH solution is 1 . 2g cm ^ - 3 . The molality of this solution is m (Round off to the Nearest Integer): [Use : Atomic masses : Na: 23 . 0uO: 16 . 0u H: 1 . 0u

JEE Main 2021 Solution View → 120

The number of significant figures in 0 . 00340 is _________

JEE Main 2021 Solution View →
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General Organic Chemistry (1,144)Coordination Compounds (715)Chemical Bonding and Molecular Structure (635)Alcohols Phenols and Ethers (599)Thermodynamics (C) (574)Aldehydes and Ketones (526)Electrochemistry (526)Structure of Atom (526)d and f Block Elements (517)Hydrocarbons (509)Amines (495)Biomolecules (493)

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