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Some Basic Concepts of Chemistry PYQs - Last 10 Years

JEE Main / Chemistry / Physical Chemistry / 223 recent questions

ChemistryPhysical Chemistry2017-2026
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Practice 223 JEE Main Chemistry questions from Some Basic Concepts of Chemistry. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.

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2017-2026
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223
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Last 10 Years Some Basic Concepts of Chemistry Questions

Showing 50 of 223 filtered questions.

1Some Basic Concepts Of Chemistry
A solution is prepared by adding 1 mole ethyl alcohol in 9 mole water. The mass percent of solute in the solution is ________ (Integer answer) (Given : Molar mass in \(\mathrm{g} \mathrm{~mol}^{-1}\) Ethyl alcohol : 46 water : 18)
INTEGER+4 / -12024
2Some Basic Concepts Of Chemistry
The density of '\(x\)' \(\mathrm{M}\) solution ('\(x\)' molar) of \(\mathrm{NaOH}\) is \(1.12 \mathrm{~g} \mathrm{~mL}^{-1}\), while in molality, the concentration of the solution is \(3 \mathrm{~m}\) ( 3 molal). Then \(x\) is
(Given : Mola...
MCQ+4 / -12024
3Some Basic Concepts Of Chemistry
Molality \((\mathrm{m})\) of \(3 \mathrm{M}\) aqueous solution of \(\mathrm{NaCl}\) is :
(Given : Density of solution \(=1.25 \mathrm{~g} \mathrm{~mL}^{-1}\), Molar mass in \(\mathrm{g} \mathrm{~mol}^{-1}: \mathrm{Na}-23, \mathrm{Cl}-35.5\)...
MCQ+4 / -12024
4Some Basic Concepts Of Chemistry
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 :
MCQ+4 / -12024
5Some Basic Concepts Of Chemistry
The number of moles of methane required to produce \(11 \mathrm{~g} \mathrm{~CO}_2(\mathrm{g})\) after complete combustion is : (Given molar mass of methane in \(\mathrm{g} \mathrm{~mol}^{-1}: 16\) )
MCQ+4 / -12024
6Some Basic Concepts Of Chemistry
\(\mathrm{Xg}\) of ethylamine is subjected to reaction with \(\mathrm{NaNO}_2 / \mathrm{HCl}\) followed by water; evolved dinitrogen gas which occupied \(2.24 \mathrm{~L}\) volume at STP. X is _________ \(\times 10^{-1} \mathrm{~g}\).
INTEGER+4 / -12024
7Some Basic Concepts Of Chemistry
The Molarity (M) of an aqueous solution containing \(5.85 \mathrm{~g}\) of \(\mathrm{NaCl}\) in \(500 \mathrm{~mL}\) water is : (Given : Molar Mass \(\mathrm{Na}: 23\) and \(\mathrm{Cl}: 35.5 \mathrm{~gmol}^{-1}\))
MCQ+4 / -12024
8Some Basic Concepts Of Chemistry
From \(6.55 \mathrm{~g}\) of aniline, the maximum amount of acetanilide that can be prepared will be ________ \(\times 10^{-1} \mathrm{~g}\).
INTEGER+4 / -12024
9Some Basic Concepts Of Chemistry
Molar mass of the salt from \(\mathrm{NaBr}, \mathrm{NaNO}_3, \mathrm{KI}\) and \(\mathrm{CaF}_2\) which does not evolve coloured vapours on heating with concentrated \(\mathrm{H}_2 \mathrm{SO}_4\) is ________ $$\mathrm{g} \mathrm{~mol}{ }^...
INTEGER+4 / -12024
10Some Basic Concepts Of Chemistry
Number of moles of methane required to produce \(22 \mathrm{~g} \mathrm{~CO}_{2(\mathrm{~g})}\) after combustion is \(\mathrm{x} \times 10^{-2}\) moles. The value of \(\mathrm{x}\) is _________.
INTEGER+4 / -12024
11Some Basic Concepts Of Chemistry
The molarity of \(1 \mathrm{~L}\) orthophosphoric acid \(\left(\mathrm{H}_3 \mathrm{PO}_4\right)\) having \(70 \%\) purity by weight (specific gravity \(1.54 \mathrm{~g} \mathrm{~cm}^{-3}\)) is __________ \(\mathrm{M}\).
(Molar mass of $$\m...
INTEGER+4 / -12024
12Some Basic Concepts Of Chemistry
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}_...
MCQ+4 / -12024
13Some Basic Concepts Of Chemistry
\(0.05 \mathrm{~cm}\) thick coating of silver is deposited on a plate of \(0.05 \mathrm{~m}^2\) area. The number of silver atoms deposited on plate are ________ \(\times 10^{23}\). (At mass $$\mathrm{Ag}=108, \mathrm{~d}=7.9 \mathrm{~g} \ma...
INTEGER+4 / -12024
14Some Basic Concepts Of Chemistry
The mass of sodium acetate \(\left(\mathrm{CH}_3 \mathrm{COONa}\right)\) required to prepare \(250 \mathrm{~mL}\) of \(0.35 \mathrm{~M}\) aqueous solution is ________ g. (Molar mass of \(\mathrm{CH}_3 \mathrm{COONa}\) is $$82.02 \mathrm{~g}...
INTEGER+4 / -12024
15Some Basic Concepts Of Chemistry
If a substance '\(A\)' dissolves in solution of a mixture of '\(B\)' and '\(C\)' with their respective number of moles as \(\mathrm{n}_{\mathrm{A}}, \mathrm{n}_{\mathrm{B}}\) and \(\mathrm{n}_{\mathrm{C}_3}\). Mole fraction of $$\mathrm{C}$...
MCQ+4 / -12024
16Some Basic Concepts Of Chemistry
A solution of \(\mathrm{H}_2 \mathrm{SO}_4\) is \(31.4 \% \mathrm{H}_2 \mathrm{SO}_4\) by mass and has a density of \(1.25 \mathrm{~g} / \mathrm{mL}\). The molarity of the \(\mathrm{H}_2 \mathrm{SO}_4\) solution is _________ \(\mathrm{M}\) ...
INTEGER+4 / -12024
17Some Basic Concepts Of Chemistry
Molality of 0.8 M H\(_2\)SO\(_4\) solution (density 1.06 g cm\(^{-3}\)) is ________ \(\times10^{-3}\) m.
INTEGER+4 / -12024
18Some Basic Concepts Of Chemistry
If \(50 \mathrm{~mL}\) of \(0.5 \mathrm{M}\) oxalic acid is required to neutralise \(25 \mathrm{~mL}\) of \(\mathrm{NaOH}\) solution, the amount of \(\mathrm{NaOH}\) in \(50 \mathrm{~mL}\) of given \(\mathrm{NaOH}\) solution is ______ g.
INTEGER+4 / -12024
19Some Basic Concepts Of Chemistry
Mass of methane required to produce \(22 \mathrm{~g}\) of \(\mathrm{CO}_2\) after complete combustion is _______ g.
(Given Molar mass in g mol-1 \(\mathrm{C}=12.0\), \(\mathrm{H}=1.0\), \(\mathrm{O}=16.0)\)
INTEGER+4 / -12024
20Some Basic Concepts Of Chemistry
Volume of \(3 \mathrm{M} \mathrm{~NaOH}\) (formula weight \(40 \mathrm{~g} \mathrm{~mol}^{-1}\) ) which can be prepared from \(84 \mathrm{~g}\) of \(\mathrm{NaOH}\) is __________ \(\times 10^{-1} \mathrm{dm}^3\).
INTEGER+4 / -12024
21Some Basic Concepts Of Chemistry
\(9.3 \mathrm{~g}\) 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 _________ \(\times 10^{-1} \mathrm{~g}\).
(Given mol...
INTEGER+4 / -12024
22Some Basic Concepts Of Chemistry
The quantity which changes with temperature is :
MCQ+4 / -12024
23Some Basic Concepts Of Chemistry
Consider the following reaction :
\(3 \mathrm{PbCl}_2+2\left(\mathrm{NH}_4\right)_3 \mathrm{PO}_4 \rightarrow \mathrm{Pb}_3\left(\mathrm{PO}_4\right)_2+6 \mathrm{NH}_4 \mathrm{Cl}\)

If $72 ~\mathrm{mmol}$ of $\mathrm{PbCl}_2$ is mixed wi...
INTEGER+4 / -12024
24Some Basic Concepts Of Chemistry
$10 \mathrm{~mL}$ of gaseous hydrocarbon on combustion gives $40 \mathrm{~mL}$ of $\mathrm{CO}_2(\mathrm{~g})$ and $50 \mathrm{~mL}$ of water vapour. Total number of carbon and hydrogen atoms in the hydrocarbon is _________ .
INTEGER+4 / -12024
25Some Basic Concepts Of Chemistry
\(0.5 \mathrm{~g}\) of an organic compound \((\mathrm{X})\) with \(60 \%\) carbon will produce __________ \(\times 10^{-1} \mathrm{~g}\) of \(\mathrm{CO}_{2}\) on complete combustion.
INTEGER+4 / -12023
26Some Basic Concepts Of Chemistry
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
MCQ+4 / -12023
27Some Basic Concepts Of Chemistry
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)
INTEGER+4 / -12023
28Some Basic Concepts Of Chemistry
The volume of \(0.02 ~\mathrm{M}\) aqueous \(\mathrm{HBr}\) required to neutralize \(10.0 \mathrm{~mL}\) of \(0.01 ~\mathrm{M}\) aqueous \(\mathrm{Ba}(\mathrm{OH})_{2}\) is (Assume complete neutralization)
MCQ+4 / -12023
29Some Basic Concepts Of Chemistry
On complete combustion, \(0.492 \mathrm{~g}\) of an organic compound gave \(0.792 \mathrm{~g}\) of \(\mathrm{CO}_{2}\). The % of carbon in the organic compound is ___________ (Nearest integer)
INTEGER+4 / -12023
30Some Basic Concepts Of Chemistry
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 __________ L (Nearest integer)
(Given : Mola...
INTEGER+4 / -12023
31Some Basic Concepts Of Chemistry
A sample of a metal oxide has formula $\mathrm{M}_{0.83} \mathrm{O}_{1.00}$. The metal $\mathrm{M}$ can exist in two oxidation states $+2$ and $+3$. In the sample of $\mathrm{M}_{0.83} \mathrm{O}_{1.00}$, the percentage of metal ions existi...
INTEGER+4 / -12023
32Some Basic Concepts Of Chemistry
Assume carbon burns according to the following equation :

$2 \mathrm{C}_{(\mathrm{s})}+\mathrm{O}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{CO}(\mathrm{g})$

when $12 \mathrm{~g}$ carbon is burnt in $48 \mathrm{~g}$ of oxygen, the volume of c...
INTEGER+4 / -12023
33Some Basic Concepts Of Chemistry
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 $A$ ?
MCQ+4 / -12023
34Some Basic Concepts Of Chemistry
Some amount of dichloromethane \(\left(\mathrm{CH}_{2} \mathrm{Cl}_{2}\right)\) is added to \(671.141 \mathrm{~mL}\) of chloroform \(\left(\mathrm{CHCl}_{3}\right)\) to prepare \(2.6 \times 10^{-3} \mathrm{M}\) solution of $$\mathrm{CH}_{2}...
INTEGER+4 / -12023
35Some Basic Concepts Of Chemistry
The strength of 50 volume solution of hydrogen peroxide is ______ $\mathrm{g} / \mathrm{L}$ (Nearest integer).

Given:

Molar mass of $\mathrm{H}_{2} \mathrm{O}_{2}$ is $34 \mathrm{~g} \mathrm{~mol}^{-1}$

Molar volume of gas at $\mathrm{ST...
INTEGER+4 / -12023
36Some Basic Concepts Of Chemistry
$1 \mathrm{~L}, 0.02 \mathrm{M}$ solution of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right]$ Br is mixed with $1 \mathrm{~L}, 0.02 \mathrm{M}$ solution of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm...
MCQ+4 / -12023
37Some Basic Concepts Of Chemistry
When 0.01 mol of an organic compound containing 60% carbon was burnt completely, 4.4 g of CO\(_2\) was produced. The molar mass of compound is _____________ g mol\(^{-1}\) (Nearest integer).
INTEGER+4 / -12023
38Some Basic Concepts Of Chemistry
The volume of HCl, containing 73 g L\(^{-1}\), required to completely neutralise NaOH obtained by reacting 0.69 g of metallic sodium with water, is __________ mL. (Nearest Integer)
(Given : molar masses of Na, Cl, O, H, are 23, 35.5, 16 and...
INTEGER+4 / -12023
39Some Basic Concepts Of Chemistry
When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?
MCQ+4 / -12023
40Some Basic Concepts Of Chemistry
In sulphur estimation, 0.471 g of an organic compound gave 1.4439 g of barium sulphate. The percentage of sulphur in the compound is ____________ (Nearest Integer)
(Given : Atomic mass Ba: 137 u, S: 32 u, O: 16 u)
INTEGER+4 / -12023
41Some Basic Concepts Of Chemistry
'25 volume' hydrogen peroxide means
MCQ+4 / -12023
42Some Basic Concepts Of Chemistry
Number of hydrogen atoms per molecule of a hydrocarbon A having 85.8% carbon is __________ (Given : Molar mass of A = 84 g mol\(^{-1}\))
INTEGER+4 / -12023
43Some Basic Concepts Of Chemistry
What is the mass ratio of ethylene glycol (\(\mathrm{C_2H_6O_2}\), molar mass = 62 g/mol) required for making 500 g of 0.25 molal aqueous solution and 250 mL of 0.25 molar aqueous solution?
MCQ+4 / -12023
44Some Basic Concepts Of Chemistry
5 g of NaOH was dissolved in deionized water to prepare a 450 mL stock solution. What volume (in mL) of this solution would be required to prepare 500 mL of 0.1 M solution? _____________
Given : Molar Mass of Na, O and H is 23, 16 and 1 g m...
INTEGER+4 / -12023
45Some Basic Concepts Of Chemistry
When \(\mathrm{Fe_{0.93}O}\) is heated in presence of oxygen, it converts to \(\mathrm{Fe_2O_3}\). The number of correct statement/s from the following is ________
A. The equivalent weight of \(\mathrm{Fe_{0.93}O}\) is $${{\mathrm{Molecular...
INTEGER+4 / -12023
46Some Basic Concepts Of Chemistry
The number of units, which are used to express concentration of solutions from the following is _________
Mass percent, Mole, Mole fraction, Molarity, ppm, Molality
INTEGER+4 / -12023
47Some Basic Concepts Of Chemistry
The density of \(3 \mathrm{M}\) solution of \(\mathrm{NaCl}\) is \(1.0 \mathrm{~g} \mathrm{~mL}^{-1}\). Molality of the solution is ____________ \(\times 10^{-2} \mathrm{~m}\). (Nearest integer).
Given: Molar mass of \(\mathrm{Na}\) and $$\...
INTEGER+4 / -12023
48Some Basic Concepts Of Chemistry
The molality of a \(10 \%(\mathrm{v} / \mathrm{v})\) solution of di-bromine solution in \(\mathrm{CCl}_{4}\) (carbon tetrachloride) is '\(x\)'. \(x=\) ____________ \(\times 10^{-2} ~\mathrm{M}\). (Nearest integer)
[Given : molar mass of $$\...
INTEGER+4 / -12023
49Some Basic Concepts Of Chemistry
The volume (in $\mathrm{mL}$) of $0.1 \mathrm{M} ~\mathrm{AgNO}_{3}$ required for complete precipitation of chloride ions present in $20 \mathrm{~mL}$ of $0.01 \mathrm{M}$ solution of $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)...
INTEGER+4 / -12023
50Some Basic Concepts Of Chemistry
\(20 \mathrm{~mL}\) of calcium hydroxide was consumed when it was reacted with \(10 \mathrm{~mL}\) of unknown solution of \(\mathrm{H}_{2} \mathrm{SO}_{4}\). Also \(20 \mathrm{~mL}\) standard solution of \(0.5 ~\mathrm{M} ~\mathrm{HCl}\) co...
INTEGER+4 / -12023