Some Basic Concepts of Chemistry

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 space occupied by a substance.
(D) Temperatures below \(0^\circ C\) are possible in Celsius scale, but in Kelvin scale negative temperature is not possible.
(E) Precision refers to the closeness of various measurements for the same quantity.

Choose the correct answer from the options given below

Among \({10}^{-9}\mathrm{g}\) (each) of the following elements, which one will have the highest number of atoms?

Element : \(\mathrm{Pb},\mathrm{Po},\mathrm{Pr}\) and \(\mathrm{Pt}\)

[JEE Main 2025, 3 Apr (Shift 1)]

0.1 M solution of KI reacts with excess of \({H}_{2}S{O}_{4}\) and \(KI{O}_{3}\) solutions. According to equation

\(5{I}^{-}+I{O}_{3}^{-}+6{H}^{+}\to 3{I}_{2}+3{H}_{2}O\)

Identify the correct statements :
(A) 200 mL of KI solution reacts with 0.004 mol of \(KI{O}_{3}\)
(B) 200 mL of KI solution reacts with 0.006 mol of \({H}_{2}S{O}_{4}\)
(C) 0.5 L of KI solution produced 0.005 mol of \({I}_{2}\)
(D) Equivalent weight of \(KI{O}_{3}\) is equal to (\(\frac{\text{ Molecular weight }}{5}\))

Choose the correct answer from the options given below

0.1 M solution of KI reacts with excess of \({H}_{2}S{O}_{4}\) and \(KI{O}_{3}\) solutions. According to equation

\(5{I}^{-}+I{O}_{3}^{-}+6{H}^{+}\to 3{I}_{2}+3{H}_{2}O\)

Identify the correct statements :
(A) 200 mL of KI solution reacts with 0.004 mol of \(KI{O}_{3}\)
(B) 200 mL of KI solution reacts with 0.006 mol of \({H}_{2}S{O}_{4}\)
(C) 0.5 L of KI solution produced 0.005 mol of \({I}_{2}\)
(D) Equivalent weight of \(KI{O}_{3}\) is equal to (\(\frac{\text{ Molecular weight }}{5}\))

Choose the correct answer from the options given below.

[JEE Main 2025, 29 Jan (Shift 2)]

Given below are two statements.

Statement-I: One mole of propyne reacts with excess of sodium to liberate half a mole of hydrogen gas.

Statement-II: Four grams of propyne reacts with sodium amide to liberate ammonia gas which occupies 224 mL at STP.

In the light of above statements, choose most appropriate answer from options given below

[JEE Main 2025, 22 Jan (Shift 1)]

An organic compound weighing 500 mg produced 220 mg of \({\mathrm{CO}}_{2}\) on complete combustion. The percentage composition of carbon in the compound is _____%. (nearest integer)
(Given molar mass in g mol^–1 of C : 12, O : 16)

[JEE Main 2025, 7 Apr (Shift 1)]

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

[JEE Main 2025, 24 Jan (Shift 2)]

Choose the Incorrect Statement about Dalton's Atomic Theory

[JEE Main 2024, 4 Apr (Shift 2)]

\({\mathrm{CaCO}}_{3}(\mathrm{s})+2\mathrm{HCl}(\mathrm{aq})\to\)\({\mathrm{CaCl}}_{2}(\mathrm{aq})+{\mathrm{CO}}_{2}(\mathrm{g}){\mathrm{H}}_{2}\mathrm{O}(\mathrm{l})\)
Consider the above reaction, what mass of \({\mathrm{CaCl}}_{2}\) will be formed if \(250\) mL of \(0.76\mathrm{M}\) reacts with \(1000\) g of \({\mathrm{CaCO}}_{3}\) ?
(Given : Molar mass of \(\mathrm{Ca},\mathrm{C},\mathrm{O},\mathrm{H}\) and \(\mathrm{Cl}\) are \(40,12,16,1\) and \(35.5\mathrm{g}{\mathrm{mol}}^{-1}\), respectively)

[JEE Main 2025, 2 Apr (Shift 1)]

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 space occupied by a substance.
(D) Temperatures below \(0^\circ C\) are possible in Celsius scale, but in Kelvin scale negative temperature is not possible.
(E) Precision refers to the closeness of various measurements for the same quantity.

Choose the correct answer from the options given below.

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:

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

The incorrect postulates of the Dalton's atomic theory are:

(A) Atoms of different elements differ in mass.

(B) Matter consists of divisible atoms.

(C) Compounds are formed when atoms of different element combine in a fixed ratio.

(D) All the atoms of given element have different properties including mass.

(E) Chemical reactions involve reorganisation of atoms.

Choose the correct answer from the options given below:

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 space occupied by a substance.
(D) Temperatures below \(0^\circ C\) are possible in Celsius scale, but in Kelvin scale negative temperature is not possible.
(E) Precision refers to the closeness of various measurements for the same quantity.

Choose the correct answer from the options given below

The quantity which changes with temperature is:

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 g/mL.

[JEE Main 2025, 28 Jan (Shift 1)]

\(2.8\times {10}^{-3}\mathrm{mol}\mathrm{of}{\mathrm{CO}}_{2}\)is left after removing \({10}^{21}\)molecules from its ' x ' mg sample. The mass of \({\mathrm{CO}}_{2}\) taken initially is

(Given : \({\mathrm{N}}_{\mathrm{A}}=6.02\times {10}^{23}{\mathrm{mol}}^{-1}\))

[JEE Main 2025, 23 Jan (Shift 1)]

10 mL of 2 M NaOH solution is added to 20 mL of 1 M HCl solution kept in a beaker. Now, 10 mL of this mixture is poured into a volumetric flask of 100 mL containing 2 moles of HCl and made the volume upto the mark with distilled water. The solution in this flask is

[JEE Main 2025, 3 Apr (Shift 2)]

7.3 g of benzalacetone is synthesized from 10.6 g of benzaldehyde using acetone as another reactant. Percentage yield of benzalacetone is (memory based jee mains shift-2 29/01/2025)

On combustion \(0.210\)g of an orgainc compound containing \(\mathrm{C},\mathrm{H}\) and \(O\) gave \(0.127\mathrm{g}{\mathrm{H}}_{2}\mathrm{O}\) and \(0.307\mathrm{g}{\mathrm{CO}}_{2}\). The percentages of hydrogen and oxygen in the given organic compound respectively are

[JEE Main 2025, 8 Apr (Shift 1)]

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

\(10 mL\) of gaseous hydrocarbon on combustion gives \(40 mL\) of \(CO _2( g )\) and \(50 mL\) of water vapour. The sum of number of carbon and hydrogen atoms in the hydrocarbon is___________

On complete combustion \(1.0\) g of an organic compound (X) gave \(1.46g\) of \({\mathrm{CO}}_{2}\) and \(0.567\) g of \({\mathrm{H}}_{2}\mathrm{O}\). The empirical formula mass of compound (X) is _______ g .
(Given molar mass in \({\mathrm{gmol}}^{-1}\mathrm{C}:12,\mathrm{H}:1,\mathrm{O}:16\) )

[JEE Main 2025, 2 Apr (Shift 1)]

Number of moles of methane required to produce 22 g \(CO _{2( g )}\) after combustion is \(x \times 10^{-2}\) moles. The value of \(x\) is ......... .

\(0.5\)g of an organic compound on combustion gave \(1.46g\) of \({\mathrm{CO}}_{2}\) and \(0.9g\) of \({\mathrm{H}}_{2}\mathrm{O}\). The percentage of carbon in the compound is ______%. (Nearest integer)
[Given : Molar mass (in \({\mathrm{gmol}}^{-1}\)) \(\mathrm{C}:12,\mathrm{H}:1,\mathrm{O}:16\)]

[JEE Main 2025, 3 Apr (Shift 1)]

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

Choose the Incorrect Statement about Dalton's Atomic Theory

[JEE Main 2024, 4 Apr (Shift 2)]

The incorrect postulates of the Dalton's atomic theory are

(a) Atoms of different elements differ in mass.
(b) Matter consists of divisible atoms.
(c) Compounds are formed when atoms of different element combine in a fixed ratio.
(d) All the atoms of a given element have different properties including mass.
(e) Chemical reactions involve reorganisation of atoms.

Choose the correct answer from the options given below

The incorrect postulates of the Dalton's atomic theory are

(a) Atoms of different elements differ in mass.
(b) Matter consists of divisible atoms.
(c) Compounds are formed when atoms of different element combine in a fixed ratio.
(d) All the atoms of a given element have different properties including mass.
(e) Chemical reactions involve reorganisation of atoms.

Choose the correct answer from the options given below

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

[JEE Main 2025, 3 Apr (Shift 2)]

The number of moles of methane required to produce 11g CO₂(g) after complete combustion is: (Given molar mass of methane in \(\mathrm{g}{\mathrm{mol}}^{-1}:16\))

In a compound contains 54.2 % carbon, 9.2 % of hydrogen and rest are oxygen. What is molecular formula of compound, if molecular mass is 132 g/mol ?
(Memory Based JEE Mains 24/01/2025 ,Shift -2)

The incorrect postulates of the Dalton's atomic theory are:

(A) Atoms of different elements differ in mass.

(B) Matter consists of divisible atoms.

(C) Compounds are formed when atoms of different element combine in a fixed ratio.

(D) All the atoms of given element have different properties including mass.

(E) Chemical reactions involve reorganisation of atoms.

Choose the correct answer from the options given below:

A sample of \(\mathrm{CaCO}_3\) and \(\mathrm{MgCO}_3\) weighed \(2.21 \mathrm{~g}\) is ignited to constant weight of \(1.152 \mathrm{~g}\). The composition of mixture is : (Given molar mass in \(\mathrm{g} \mathrm{mol}^{-1} \mathrm{CaCO}_3: 100, \mathrm{MgCO}_3: 84\) )

A sample of \(\mathrm{CaCO}_3\) and \(\mathrm{MgCO}_3\) weighed \(2.21 \mathrm{~g}\) is ignited to constant weight of \(1.152 \mathrm{~g}\). The composition of mixture is : (Given molar mass in \(\mathrm{g} \mathrm{mol}^{-1} \mathrm{CaCO}_3: 100, \mathrm{MgCO}_3: 84\) )

On complete combustion \(1.0\) g of an organic compound (X) gave \(1.46g\) of \({\mathrm{CO}}_{2}\) and \(0.567\) g of \({\mathrm{H}}_{2}\mathrm{O}\). The empirical formula mass of compound (X) is _______ g .
(Given molar mass in \({\mathrm{gmol}}^{-1}\mathrm{C}:12,\mathrm{H}:1,\mathrm{O}:16\) )

[JEE Main 2025, 2 Apr (Shift 1)]

The mass of iron converted into \(F{e}_{3}{O}_{4}\) by the action of 18 g of steam is:
(Given: Molar mass of H , O and Fe are 1,16 and \(56gmo{l}^{-1}\) respectively)
Assume iron is present in excess:
[JEE Main 2026, 2 April, shift-1]

Choose the Incorrect Statement about Dalton's Atomic Theory

The correct name of I & II in the following process is :

Solid \(\overset{\mathrm{I}}{\to }\)Vapours\(\overset{\mathrm{II}}{\to }\)Solid
Memory Based Question 28/Jan/25 Evening shift

If a substance ' \(A\) ' dissolves in solution of a mixture of ' \(B\) ' and ' \(C\) ' with their respective number of moles as \(n _{ A }, n _{ B }\) and \(n _{ C }\). Mole fraction of \(C\) in the solution is

[JEE Main 2024, 30 Jan (Shift 2)]

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 g/mL.

Butane reacts with oxygen to produce carbon dioxide and water following the equation given below
\({\mathrm{C}}_{4}{\mathrm{H}}_{10}(\mathrm{g})+\frac{13}{2}{\mathrm{O}}_{2}(\mathrm{g})\to 4{\mathrm{CO}}_{2}(\mathrm{g})+5{\mathrm{H}}_{2}\mathrm{O}(\mathrm{l})\)
If \(174.0\)kg of butane is mixed with \(320.0\) kg of \({\mathrm{O}}_{2}\), the volume of water formed in litres is ________ .(Nearest integer)
[Given : (a) Molar mass of \(\mathrm{C},\mathrm{H},\mathrm{O}\)are 12, 1, \(16\mathrm{g}{\mathrm{mol}}^{-1}\) respectively, (b) Density of water \(\left.=1\mathrm{g}{\mathrm{mL}}^{-1}\right]\)

[JEE Main 2025, 7 Apr (Shift 2)]

Choose the Incorrect Statement about Dalton's Atomic Theory

[JEE Main 2024, 4 Apr (Shift 2)]

\({\mathrm{CaCO}}_{3}(\mathrm{s})+2\mathrm{HCl}(\mathrm{aq})\to\)\({\mathrm{CaCl}}_{2}(\mathrm{aq})+{\mathrm{CO}}_{2}(\mathrm{g})+{\mathrm{H}}_{2}\mathrm{O}(\mathrm{l})\)

Consider the above reaction, what mass of \({\mathrm{CaCl}}_{2}\) will be formed if \(250\) mL of \(0.76\mathrm{M}\) reacts with \(1000\) g of \({\mathrm{CaCO}}_{3}\) ?
(Given : Molar mass of \(\mathrm{Ca},\mathrm{C},\mathrm{O},\mathrm{H}\) and \(\mathrm{Cl}\) are \(40,12,16,1\) and \(35.5\mathrm{g}{\mathrm{mol}}^{-1}\), respectively)

[JEE Main 2025, 2 Apr (Shift 1)]

Among \({10}^{-9}\mathrm{g}\) (each) of the following elements, which one will have the highest number of atoms?

Element : \(\mathrm{Pb},\mathrm{Po},\mathrm{Pr}\) and \(\mathrm{Pt}\)

[JEE Main 2025, 3 Apr (Shift 1)]

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:

10 mL of 2 M NaOH solution is added to 20 mL of 1 M HCl solution kept in a beaker. Now, 10 mL of this mixture is poured into a volumetric flask of 100 mL containing 2 moles of HCl and made the volume upto the mark with distilled water. The solution in this flask is

[JEE Main 2025, 3 Apr (Shift 2)]

Choose the Incorrect Statement about Dalton's Atomic Theory

The quantity which changes with temperature is:

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 g/mL.

[JEE Main 2025, 28 Jan (Shift 1)]

\(2.8\times {10}^{-3}\mathrm{mol}\mathrm{of}{\mathrm{CO}}_{2}\)is left after removing \({10}^{21}\)molecules from its ' x ' mg sample. The mass of \({\mathrm{CO}}_{2}\) taken initially is

(Given : \({\mathrm{N}}_{\mathrm{A}}=6.02\times {10}^{23}{\mathrm{mol}}^{-1}\))

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

[JEE Main 2025, 4 Apr (Shift 2)]

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 space occupied by a substance.
(D) Temperatures below \(0^\circ C\) are possible in Celsius scale, but in Kelvin scale negative temperature is not possible.
(E) Precision refers to the closeness of various measurements for the same quantity.

Choose the correct answer from the options given below

[JEE Main 2025, 29 Jan (Shift 1)]

Choose the Incorrect Statement about Dalton's Atomic Theory

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 g/mL

Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature?

[JEE Main 2025, 24 Jan (Shift 2)]

The mass of sodium acetate (CH₃COONa) required to prepare 250 mL of 0.35 M aqueous solution is_____ g. (Molar mass of CH₃COONa is 82.02 g mol^–1) (Nearest integer)

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 space occupied by a substance.
(D) Temperatures below \(0^\circ C\) are possible in Celsius scale, but in Kelvin scale negative temperature is not possible.
(E) Precision refers to the closeness of various measurements for the same quantity.

Choose the correct answer from the options given below

Given below are two statements.

Statement-I: One mole of propyne reacts with excess of sodium to liberate half a mole of hydrogen gas.

Statement-II: Four grams of propyne reacts with sodium amide to liberate ammonia gas which occupies 224 mL at STP.

In the light of above statements, choose most appropriate answer from options given below

[JEE Main 2025, 22 Jan (Shift 1)]

On combustion \(0.210\)g of an orgainc compound containing \(\mathrm{C},\mathrm{H}\) and \(O\) gave \(0.127\mathrm{g}{\mathrm{H}}_{2}\mathrm{O}\) and \(0.307\mathrm{g}{\mathrm{CO}}_{2}\). The percentages of hydrogen and oxygen in the given organic compound respectively are

[JEE Main 2025, 8 Apr (Shift 1)]

The correct name of I & II in the following process is :

Solid \(\overset{\mathrm{I}}{\to }\)Vapours\(\overset{\mathrm{II}}{\to }\)Solid
Memory Based Question 28/Jan/25 Evening shift

Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature?

[JEE Main 2025, 24 Jan (Shift 2)]

The number of moles of methane required to produce 11g CO₂(g) after complete combustion is:

(Given molar mass of methane in g mol^–1 : 16)

Choose the incorrect statement about Dalton's atomic theory.

\(2.8\times {10}^{-3}\mathrm{mol}\mathrm{of}{\mathrm{CO}}_{2}\)is left after removing \({10}^{21}\)molecules from its ' x ' mg sample. The mass of \({\mathrm{CO}}_{2}\) taken initially is

(Given : \({\mathrm{N}}_{\mathrm{A}}=6.02\times {10}^{23}{\mathrm{mol}}^{-1}\))

[JEE Main 2025, 23 Jan (Shift 1)]

In a compound contains 54.2 % carbon, 9.2 % of hydrogen and rest are oxygen. What is molecular formula of compound, if molecular mass is 132 g/mol ?

Given below are two statements.

Statement-I: One mole of propyne reacts with excess of sodium to liberate half a mole of hydrogen gas.

Statement-II: Four grams of propyne reacts with sodium amide to liberate ammonia gas which occupies 224 mL at STP.

In the light of above statements, choose most appropriate answer from options given below

[JEE Main 2025, 22 Jan (Shift 1)]

Choose the Incorrect Statement about Dalton's Atomic Theory

Combustion of glucose \(\left( C _6 H _{12} O _6\right)\) 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 glucose in \(g mol ^{-1}=180\) ]

[JEE Main 2024, 08 Apr (Shift 1)]

Combustion of glucose \(\left( C _6 H _{12} O _6\right)\) 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 glucose in \(g mol ^{-1}=180\) ]

[JEE Main 2024, 08 Apr (Shift 1)]

For the given reaction:

CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂

If 90g CaCO₃ is added to 300 mL of HCl which contains 38.55% HCl by mass and has density 1.13 g mL^–1, then which of the following option is correct?

Given molar mass of H, Cl, Ca and O are 1, 35.5, 40 and 16 g mol^–1 respectively.

[JEE Main 2026, 28 Jan (Shift 2)]

The number of moles of methane required to produce 11g CO₂(g) after complete combustion is:

(Given molar mass of methane in g mol^–1 : 16)

For the given reaction:

CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂

If 90g CaCO₃ is added to 300 mL of HCl which contains 38.55% HCl by mass and has density 1.13 g mL^–1, then which of the following option is correct?

Given molar mass of H, Cl, Ca and O are 1, 35.5, 40 and 16 g mol^–1 respectively.

[JEE Main 2026, 28 Jan (Shift 2)]

Consider the following reaction :
\[3 PbCl _2+2\left( NH _4\right)_3 PO _4 \rightarrow Pb _3\left( PO _4\right)_2+6 NH _4 Cl\]

If \(72 mmol\) of \(PbCl _2\) is mixed with \(50 mmol\) of \(\left( NH _4\right)_3 PO _4\), then the amount of \(Pb _3\left( PO _4\right)_2\) formed is ________mmol (nearest integer).

An organic compound gives 0.220 g of CO₂ and 0.126 g of H₂O on complete combustion. If the percentage of carbon in the compound is 24%, then the percentage of hydrogen is ___ × 10⁻¹. (Nearest integer)

[JEE Main 2023, 13 Apr (Shift 1)]

The ammonia \( \left(\mathrm{NH}_{3}\right) \) released on quantitative reaction of \( 0.6 \mathrm{~g} \) urea \( \left(\mathrm{NH}_{2} \mathrm{CONH}_{2}\right) \) with sodium hydroxide \( (\mathrm{NaOH}) \) can be neutralized by:

If 5 moles of \(\mathrm{BaCl}_{2}\) is mixed with 2 moles of \(\mathrm{Na}_{3} \mathrm{PO}_{4}\), the maximum number of moles of \(\mathrm{Ba}_{3}\left(\mathrm{PO}_{4}\right)_{2}\) formed is...............(Nearest integer)

[JEE Main 2023, 6 Apr (Shift 1)]

\({\text{2IO}}_{3}^{-}+x{\text{I}}^{-}+12{\text{H}}^{+}\to 6{\text{I}}_{2}+6{\text{H}}_{2}O\) What is the value of x?

[JEE Main 2023, 8 Apr (Shift 1)]

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, 8 Apr (Shift 2)]

Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. The volume of hydrogen gas produced at STP from the reaction of \(11.5 \mathrm{~g}\) of zinc with excess \(\mathrm{HCl}\) is ............. \(\mathrm{L}\) (Nearest integer)

(Given : Molar mass of \(\mathrm{Zn}\) is \(65.4 \mathrm{~g} \mathrm{~mol}^{-1}\) and Molar volume of \(\mathrm{H}_{2}\) at \(\mathrm{STP}=22.7 \mathrm{~L}\) )

[JEE Main 2023, 31 Jan (Shift 1)]

The number of atoms in \(8 \mathrm{~g}\) of sodium is \(x \times 10^{23}\). The value of \(x\) is (Nearest integer)
[Given : \(\mathrm{N}_{\mathrm{A}}=6.02 \times 10^{23} \mathrm{~mol}^{-1}\)
Atomic mass of \(\mathrm{Na}=23.0 \mathrm{u}]\)

[JEE Main 2021, 1 Sep (Shift 2)]

A \(20\mathrm{mL}\) solution containing \(0.2\mathrm{g}\) impure \({\mathrm{H}}_{2}{\mathrm{O}}_{2}\) reacts completely with \(0.316\mathrm{g}\) of \({\mathrm{KMnO}}_{4}\) in acid solution. The purity of \({\mathrm{H}}_{2}{\mathrm{O}}_{2}\) (in %) is.......... (mol wt. of \({\mathrm{H}}_{2}{\mathrm{O}}_{2}\) = \(34\), mol wt. of \({\mathrm{KMnO}}_{4}\) = \(158\))

A metal chloride contains \(55.0 \%\) of chlorine by weight. \(100 \mathrm{~mL}\) vapours of the metal chloride at STP weigh \(0.57 \mathrm{~g}\). The molecular formula of the metal chloride is (Given: Atomic mass of chlorine is \(35.5 \mathrm{u}\) )

\(4 \mathrm{~g}\) equimolar mixture of \(\mathrm{NaOH}\) and \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) contains \(\mathrm{x} ~g\) of \(\mathrm{NaOH}\) and \(y ~g\) of \(\mathrm{Na}_{2} \mathrm{CO}_{3}\). The value of 'x' is ____ (Nearest Integer)

\(0.5 \mathrm{~g}\) of an organic compound (X) with \(60 \%\) carbon will produce__________\(\times 10^{-1} \mathrm{~g}\) of \(\mathrm{CO}_{2}\) on complete combustion.

\(250\mathrm{mL}\) of \(0.5\mathrm{M}\mathrm{NaOH}\) was added to \(500\mathrm{mL}\) of 1 M HCl. The number of unreacted \(\mathrm{HCl}\) molecules in the solution after complete reaction is ___________\(\times {10}^{21}\) (Nearest integer) \(\left({\mathrm{N}}_{\mathrm{A}}=6.023\times {10}^{23}\right)\)

[JEE Main 2021, 20 Jul (Shift 1)]

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?

An analyst wants to convert. \(1L\mathrm{HCl}\) of \(\mathrm{pH}=1\) to a solution of \(\mathrm{HCl}\) of \(\mathrm{pH}2\). The volume of water needed to do this dilution is \(\mathrm{mL}\). (Nearest Integer)

[JEE Main 2023, 12 Apr (Shift 1)]

The number of molecules and moles in 2.8375 litres of \(\mathrm{O}_{2}\) at STP are respectively

[JEE Main 2023, 10 Apr (Shift 1)]

The volume of \(0.02\mathrm{M}\) aqueous HBr required to neutralize \(10.0\mathrm{mL}\) of \(0.01\mathrm{M}\) aqueous \(\mathrm{Ba}(\mathrm{OH}{)}_{2}\) is (Assume complete neutralization)

[JEE Main 2023, 6 Apr (Shift 2)]

The volume of hydrogen liberated at STP by treating \(2.4 \mathrm{~g}\) of magnesium with excess of hydrochloric acid is ...... \(\times 10^{-2} \mathrm{~L}\)

Given: Molar volume of gas is \(22.4 \mathrm{~L}\) at STP. Molar mass of magnesium is \(24 \mathrm{~g} \mathrm{~mol}^{-1}\)

[JEE Main 2023, 11 Apr (Shift 2)]

Aluminium reacts with sulfuric acid to form aluminium sulfate and hydrogen. What is the volume of hydrogen gas in liters (L) produced at \(300 \mathrm{~K}\) and \(1.0 \mathrm{~atm}\) pressure, when \(5.4 \mathrm{~g}\) of aluminium and \(50.0 \mathrm{~mL}\) of \(5.0 \mathrm{~M}\) sulfuric acid are combined for the reaction?

(Use molar mass of aluminium as \(27.0 \mathrm{~g} \mathrm{~mol}^{-1}, \mathrm{R}=0.082\) atm \(\mathrm{L} \mathrm{mol}^{-1} \mathrm{~K}^{-1}\) )

The volume (in mL) of 0.125 M AgNO₃ required to quantitatively precipitate chloride ions present in 0.3 g of [Co(NH₃)₆]Cl₃ is ______.
(Molar mass of [Co(NH₃)₆]Cl₃ = 267.46 g/mol)

[JEE Main 2020, 8 Jan (Shift 1)]