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Some Basic Concepts of Chemistry — JEE Main & Advanced Chemistry PYQs

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

432 questionsChemistrySolutions on every page
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. 3 10⁻⁴ N_A

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 O₂ gas B. 4 g of SO₂ gas C.

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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.)

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What volume of hydrogen gas at STP would be liberated by action of 50 mL of H₂SO₄ of 50 % purity (density = 1.3 g mL ⁻¹ ) on 20 g of zinc ? Given : Molar mass of H, O, S, Zn are 1,

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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)

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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 SO₂ 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 CO₂(g) formed when 3.38 g of this hydrocarbon is completely b

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 which o

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. 'A

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In the reaction, 2 Al ( s )+6 HCl ( aq ) 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 aq

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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 Ca -40

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 is

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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 In

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 resp

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 ) 4 CO ₂( ~g )+5 H ₂ O ( l ) If 174.0 kg of butane is

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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 mo

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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

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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 intege

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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 .

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

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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. (Giv

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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, I : 127) )

JEE Main 2025 Solution View → 25

( CaCO ₃( ~s )+2 HCl ( aq ) 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 with 1000 g of

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. (Given mola

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 s

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 ⁻¹ M

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 (Gi

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 : [Given

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 ) 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 27.

JEE Main 2025 Solution View → 37

2.8 10⁻³ ~mol of CO ₂ is left after removing 10²¹ molecules from its ' x ' mg sample. The mass of CO ₂ taken initially is Given: N _ A =6.02 10²³ ~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 ac

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 ______ ( 10⁻³ ~m ). (neare

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 of

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 ) ). Then (x ) is (

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 (26.4 ~g

JEE Main 2024 Solution View → 48

10 mL of gaseous hydrocarbon on combustion gives 40 mL of CO 2 g and 50 mL 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 72 mmol PbCl 2 is mixed with 50 mmol of NH 4 3 PO 4 , then amount of Pb 3 PO 4 2 formed in mm

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 , MgCO 3

JEE Main 2024 Solution View → 51

The molarity of 1 L 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 = 98 g mol - 1 )

JEE Main 2024 Solution View → 52

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

JEE Main 2024 Solution View → 53

0 . 05 cm 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 . 9 g cm

JEE Main 2024 Solution View → 54

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

JEE Main 2024 Solution View → 55

9 . 3 g 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 _____ × 1

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 22 g 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

1 g of a carbonate M 2 CO 3 on treatment with excess HCl produces 0 . 01 mol 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 . 220 g of CO 2 and 0 . 126 g of H 2 O on complete combustion. If the % of carbon is 24 then the % of hydrogen is _ _ _ _ _ _ _ _ _ × 10 – 1

JEE Main 2023 Solution View → 60

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

JEE Main 2023 Solution View → 61

A solution is prepared by adding 2 g 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 . 4 g of magnesium with excess of hydrochloric acid is ...... × 10 - 2 L . Given Molar volume of gas is 22 . 4 L at STP.

JEE Main 2023 Solution View → 63

25 mL of silver nitrate solution ( 1 M ) is added dropwise to 25 mL of potassium iodide ( 1 . 05 M ) 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 200 g of its 25 % solution and 500 g 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 . 1500 g of hydrated oxalic acid dissolved in water to make 2

JEE Main 2023 Solution View → 66

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

JEE Main 2023 Solution View → 72

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

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 : 2 C ( s ) + O 2 ( g ) → 2 CO (s) when 12 g carbon is burnt in 48 g of oxygen, the volume of carbon monoxide produced is

JEE Main 2023 Solution View → 75

On complete combustion, 0 . 492 g of an organic compound gave 0 . 792 g 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 . 5 g of zinc with excess HCl is L (Neares

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 = 84 g 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) is(are) Comp

JEE Advanced 2022 Solution View → 79

The treatment of an aqueous solution of 3 . 74 g 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 this brown

JEE Advanced 2022 Solution View → 80

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

JEE Main 2022 Solution View → 81

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

JEE Main 2022 Solution View → 82

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

JEE Main 2022 Solution View → 83

N 2 g + 3 H 2 g ⇌ 2 NH 3 g 20 g 5 g 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

2 L of 0 . 2 MH 2 SO 4 is reacted with 2 L of 0 . 1 MNaOH 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 + 3 Z ⇄ XYZ 3 if one mole of each of X and Y with 0 . 05 mol of Z gives compound XYZ 3 . (Given : Atomic masses of X , Y and Z are 10,20 and 30 a

JEE Main 2022 Solution View → 86

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

JEE Main 2022 Solution View → 87

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

JEE Main 2022 Solution View → 88

250 g 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 = 1 u ; C = 12 u ; O = 16 u )

JEE Main 2022 Solution View → 89

Hemoglobin contains 0 . 34 % of iron by mass. The number of Fe atoms in 3 . 3 g of hemoglobin is (Given : Atomic mass of Fe is 56 u , 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 2 L solution of Mg of concentration 48 ppm . The number of atoms of Mg in this solution is x &#21

JEE Main 2022 Solution View → 91

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

JEE Main 2022 Solution View → 92

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

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 + 2 HCl 16 moles of NaOH is required for the complete neutralisation of

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 + 4 CO g → 3 Fe l + 4 CO 2 g when 4 . 640 kg of Fe 3 O 4 and 2 . 520 kg of CO are allowed to rea

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 respec

JEE Main 2022 Solution View → 97

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

JEE Main 2022 Solution View → 98

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

JEE Main 2022 Solution View → 99

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

JEE Main 2022 Solution View → 100

The moles of methane required to produce 81 g 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 . 46 g / mL , the molarity of this solution is : (Atomic mass : Cl = 35 . 5 amu , H =

JEE Main 2022 Solution View → 102

On complete combustion 0 . 30 g of an organic compound gave 0 . 20 g of carbon dioxide and 0 . 10 g 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 681 g 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

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

JEE Main 2022 Solution View → 106

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

JEE Main 2022 Solution View → 107

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

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 the fuel is 0

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 1,

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 1,

JEE Advanced 2021 Solution View → 113

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

JEE Main 2021 Solution View → 114

100 g of propane is completely reacted with 1000 g 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 O → 2 Cr

JEE Main 2021 Solution View → 116

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

JEE Main 2021 Solution View → 117

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

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 = 250 m bar , P O 2 = 750 m bar and P SO 3 = 0 bar

JEE Main 2021 Solution View → 119

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

JEE Main 2021 Solution View → 120

The number of significant figures in 0 . 00340 is _________

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