Some Basic Concepts of Chemistry PYQs - Last 10 Years
JEE Main / Chemistry / Physical Chemistry / 223 recent questions
ChemistryPhysical Chemistry2017-2026
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.
223
PYQs on Page
Chemistry / Physical Chemistry
2017-2026
Year Range
Based on indexed question metadata
144
Last 5 Years
2022-2026
223
Last 10 Years
2017-2026
Recent Year Trend
2021
2022
2023
2024
2025
2026Latest year
202136 max PYQs/year2026
Question Types
223PYQs
INTEGER58.3%
MCQ41.7%
Difficulty Mix
#1 Easy157
#2 Medium65
#3 Hard1
144 in last 5 years223 in last 10 years
Last 10 Years Some Basic Concepts of Chemistry Questions
Showing 50 of 223 filtered questions.
1Some Basic Concepts Of Chemistry
The number of significant figures in 50000.020 \(\times\) 10\(-\)3 is _____________.
INTEGER+4 / -12021
2Some Basic Concepts Of Chemistry
The NaNO3 weighed out to make 50 mL of an aqueous solution containing 70.0 mg Na+ per mL is _________ g. (Rounded off to the nearest integer)[Given : Atomic weight in g mol\(-\)1 - Na : 23; N : 14; O : 16]
INTEGER+4 / -12021
3Some Basic Concepts Of Chemistry
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 mol L\(-\)1 is ____________ (Nearest integer) [Molar mass of KCl = 74.5]
INTEGER+4 / -12021
4Some Basic Concepts Of Chemistry
100 mL of Na3PO4 solution contains 3.45 g of sodium. The molarity of the solution is _____________ \(\times\) 10\(-\)2 mol L\(-\)1. (Nearest integer)[Atomic Masses - Na : 23.0 u, O : 16.0 u, P : 31.0 u]
INTEGER+4 / -12021
5Some Basic Concepts Of Chemistry
Consider the complete combustion of butane, the amount of butane utilized to produce 72.0 g of water is ___________ \(\times\) 10\(-\)1 g. (in nearest integer)
INTEGER+4 / -12021
6Some Basic Concepts Of Chemistry
When 10 mL of an aqueous solution of Fe2+ ions was titrated in the presence of dil H2SO4 using diphenylamine indicator, 15 mL of 0.02 M solution of K2Cr2O7 was required to get the end point. The molarity of the solution containing Fe2+ ions...
INTEGER+4 / -12021
7Some Basic Concepts Of Chemistry
The number of significant figures in 0.00340 is ____________.
INTEGER+4 / -12021
8Some Basic Concepts Of Chemistry
In basic medium \(Cr{O_4}^{2 - }\) oxidises \({S_2}{O_3}^{2 - }\) to form \(S{O_4}^{2 - }\) and itself changes into \(Cr{(OH)_4}^ -\). The volume of 0.154 M \(Cr{O_4}^{2 - }\) required to react with 40 mL of 0.25 M \({S_2}{O_3}^{2 - }\) is...
INTEGER+4 / -12021
9Some Basic Concepts Of Chemistry
Complete combustion of 1.80 g of an oxygen containing compound (CxHyOz) gave 2.64 g of CO2 and 1.08 g of H2O. The percentage of oxygen in the organic compound is :
MCQ+4 / -12021
10Some Basic Concepts Of Chemistry
4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The
molarity of the solution in M is x \(\times\) 10-1. The value of x is _______. (Rounded off to the nearest integer)
molarity of the solution in M is x \(\times\) 10-1. The value of x is _______. (Rounded off to the nearest integer)
INTEGER+4 / -12021
11Some Basic Concepts Of Chemistry
The formula of a gaseous hydrocarbon which requires 6 times of its own volume of O2 for complete oxidation and produces 4 times its own volume of CO2 is CxHy. The value of y is _____________.
INTEGER+4 / -12021
12Some Basic Concepts Of Chemistry
1.86 g of aniline completely reacts to form acetanilide. 10% of the product is lost during purification. Amount of acetanilide obtained after purification (in g) is __________ \(\times\) 10\(-\)2.
INTEGER+4 / -12021
13Some Basic Concepts Of Chemistry
If the concentration of glucose (C6H12O6) in blood is 0.72 g L\(-\)1, the molarity of glucose in blood is ____________ \(\times\) 10\(-\)3 M. (Nearest integer)[Given : Atomic mass of C = 12, H = 1, O = 16 u]
INTEGER+4 / -12021
14Some Basic Concepts Of Chemistry
An average person needs about 10000 kJ energy per day. The amount of glucose (molar mass = 180.0 g mol\(-\)1) needed to meet this energy requirement is ____________ g.(Use : \(\Delta\)CH(glucose) = \(-\)2700 kJ mol\(-\)1)
INTEGER+4 / -12021
15Some Basic Concepts Of Chemistry
250 mL of 0.5 M NaOH was added to 500 mL of 1 M HCl. The number of unreacted HCl molecules in the solution after complete reaction is ___________ \(\times\) 1021. (Nearest integer)(NA = 6.022 \(\times\) 1023)
INTEGER+4 / -12021
16Some Basic Concepts Of Chemistry
4g equimolar mixture of NaOH and Na2CO3 contains x g of NaOH and y g of Na2CO3. The value of x is ____________ g. (Nearest integer)
INTEGER+4 / -12021
17Some Basic Concepts Of Chemistry
If 80 g of copper sulphate CuSO4 . 5H2O is dissolved in deionised water to make 5L of solution. The concentration of the copper sulphate solution is x \(\times\) 10\(-\)3 mol L\(-\)1. The value of x is _____________.[Atomic masses Cu : 63.5...
INTEGER+4 / -12021
18Some Basic Concepts Of Chemistry
The number of atoms in 8g of sodium is x \(\times\) 1023. The value of x is ____________. (Nearest integer)[Given : NA = 6.02 \(\times\) 1023 mol\(-\)1Atomic mass of Na = 23.0 u]
INTEGER+4 / -12021
19Some Basic Concepts Of Chemistry
__________ grams of 3-Hydroxy propanal (MW = 74) must be dehydrated to produce 7.8 g of acrolein (MW = 56) (C3H4O) if the percentage yield is 64. (Round off to the Nearest Integer).[Given : Atomic masses : C : 12.0 u, H : 1.0 u, O : 16.0 u ...
INTEGER+4 / -12021
20Some Basic Concepts Of Chemistry
A reaction of 0.1 mole of Benzylamine with bromomethane gave 23 g of Benzyl trimethyl ammonium bromide. The number of moles of bromomethane consumed in this reaction are n \(\times\) 10\(-\)1, when n = __________. (Round off to the Nearest ...
INTEGER+4 / -12021
21Some Basic Concepts Of Chemistry
Complete combustion of 3g of ethane gives x \(\times\) 1022 molecules of water. The value of x is __________. (Round off to the Nearest Integer). [Use : NA = 6.023 \(\times\) 1023; Atomic masses in u : C : 12.0; O : 16.0; H : 1.0]
INTEGER+4 / -12021
22Some Basic Concepts Of Chemistry
10.0 mL of Na2CO3 solution is titrated against 0.2 M HCl solution. The following titre values were obtained in 5 readings :4.8 mL, 4.9 mL, 5.0 mL, 5.0 mL and 5.0 mLBased on these readings, and convention of titrimetric estimation the concen...
INTEGER+4 / -12021
23Some Basic Concepts Of Chemistry
15 mL of aqueous solution of Fe2+ in acidic medium completely reacted with 20 mL of 0.03 M aqueous Cr2O\(_7^{2 - }\). The molarity of the Fe2+ solution is __________ \(\times\) 10-2 M. (Round off to the Nearest Integer).
INTEGER+4 / -12021
24Some Basic Concepts Of Chemistry
The mole fraction of a solute in a 100 molal aqueous solution is ___________ \(\times\) 10\(-\)2. (Round off to the Nearest Integer).[Given : Atomic masses : H : 1.0 u, O : 16.0 u ]
INTEGER+4 / -12021
25Some Basic Concepts Of Chemistry
Consider the above reaction. The percentage yield of amide product is __________. (Round off to the Nearest Integer).(Given : Atomic mass : C : 12.0 u, H : 1.0 u, N : 14.0 u, O : 16.0 u, Cl : 35.5 u)
INTEGER+4 / -12021
26Some Basic Concepts Of Chemistry
\(2MnO_4^ - + b{C_2}O_4^{2 - } + c{H^ + } \to xM{n^{2 + }} + yC{O_2} + z{H_2}O\)If the above equation is balanced with integer coefficients, the value of c is ___________. (Round off to the Nearest Integer).
INTEGER+4 / -12021
27Some Basic Concepts Of Chemistry
Complete combustion of 750 g of an organic compound provides 420 g of CO2 and 210 g of H2O. The percentage composition of carbon and hydrogen in organic compound is 15.3 and ___________ respectively. (Round off to the Nearest Integer).
INTEGER+4 / -12021
28Some Basic Concepts Of Chemistry
A 6.50 molal solution of KOH (aq.) has a density of 1.89 g cm\(-\)3. The molarity of the solution is ____________ mol dm\(-\)3. (Round off to the Nearest Integer).[Atomic masses : K : 39.0 u; O : 16.0 u; H : 1.0 u]
INTEGER+4 / -12021
29Some Basic Concepts Of Chemistry
When 35 mL of 0.15 M lead nitrate solution is mixed with 20 mL of 0.12 M chromic sulphate solution, _________ \(\times\) 10\(-\)5 moles of lead sulphate precipitate out. (Round off to the Nearest Integer).
INTEGER+4 / -12021
30Some Basic Concepts Of Chemistry
The exact volumes of 1 M NaOH solution required to neutralise 50 mL of 1 M H3PO3 solution and 100 mL of 2 M H3PO2 solution, respectively, are :
MCQ+4 / -12021
31Some Basic Concepts Of Chemistry
The molarity of HNO3 in a sample which has
density 1.4 g/mL and mass percentage of 63%
is _____.
(Molecular Weight of HNO3 = 63)
density 1.4 g/mL and mass percentage of 63%
is _____.
(Molecular Weight of HNO3 = 63)
INTEGER+4 / -02020
32Some Basic Concepts Of Chemistry
The hardness of a water sample containing
10–3 M MgSO4 expressed as CaCO3 equivalents
(in ppm) is ______.
(molar mass of MgSO4 is 120.37 g/mol)
10–3 M MgSO4 expressed as CaCO3 equivalents
(in ppm) is ______.
(molar mass of MgSO4 is 120.37 g/mol)
INTEGER+4 / -02020
33Some Basic Concepts Of Chemistry
10.30 mg of O2 is dissolved into a liter of sea
water of density 1.03 g/mL. The concentration
of O2 in ppm is__________.
water of density 1.03 g/mL. The concentration
of O2 in ppm is__________.
INTEGER+4 / -02020
34Some Basic Concepts Of Chemistry
Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to
achieve 10 ppm of iron in 100 kg of wheat is _______.
Atomic weight : Fe = 55.85; S = 32.00;
O = 16.00
achieve 10 ppm of iron in 100 kg of wheat is _______.
Atomic weight : Fe = 55.85; S = 32.00;
O = 16.00
INTEGER+4 / -02020
35Some Basic Concepts Of Chemistry
The volume (in mL) of 0.125 M AgNO3 required to quantitatively precipitate chloride ions in 0.3 g of
[Co(NH3)6]Cl3 is ________.
M[Co(NH3)6Cl3] = 267.46 g/mol
MAgNO3 = 169.87 g/mol
[Co(NH3)6]Cl3 is ________.
M[Co(NH3)6Cl3] = 267.46 g/mol
MAgNO3 = 169.87 g/mol
INTEGER+4 / -02020
36Some Basic Concepts Of Chemistry
Amongst the following statements, that which was not proposed by Dalton was :
MCQ+4 / -12020
37Some Basic Concepts Of Chemistry
The ammonia (NH3) released on quantitative reaction of 0.6 g urea (NH2CONH2) with sodium hydroxide (NaOH) can be neutralized by :
MCQ+4 / -12020
38Some Basic Concepts Of Chemistry
The flocculation value of HCl for arsenic sulphide sol. is 30 m mol L-1 If H2SO4 is used for the flocculatiopn of arsenic sulphide, the amount in grams, of H2SO4 in 250 ml required for the above purposed is ______.
(molecular mass of H2SO4 ...
(molecular mass of H2SO4 ...
INTEGER+4 / -02020
39Some Basic Concepts Of Chemistry
A solution of two components containing
n1 moles of the 1st component and n2 moles of
the 2nd component is prepared. M1 and M2 are
the molecular weights of component 1 and 2
respectively. If d is the density of the solution
in g mL–1, C2 is...
n1 moles of the 1st component and n2 moles of
the 2nd component is prepared. M1 and M2 are
the molecular weights of component 1 and 2
respectively. If d is the density of the solution
in g mL–1, C2 is...
MCQ+4 / -12020
40Some Basic Concepts Of Chemistry
The average molar mass of chlorine is
35.5 g mol–1. The ratio of 35Cl to 37Cl in naturally
occuring chlorine is close to :
35.5 g mol–1. The ratio of 35Cl to 37Cl in naturally
occuring chlorine is close to :
MCQ+4 / -12020
41Some Basic Concepts Of Chemistry
The mass of ammonia in grams produced when
2.8 kg of dinitrogen quantitatively reacts with 1
kg of dihydrogen is _______.
2.8 kg of dinitrogen quantitatively reacts with 1
kg of dihydrogen is _______.
INTEGER+4 / -02020
42Some Basic Concepts Of Chemistry
A 20.0 mL solution containing 0.2 g impure
H2O2 reacts completely with 0.316 g of KMnO4
in acid solution. The purity of H2O2 (in %) is
_____________
(mol. wt. of H2O2 = 34; mol. wt. of
KMnO4 = 158)
H2O2 reacts completely with 0.316 g of KMnO4
in acid solution. The purity of H2O2 (in %) is
_____________
(mol. wt. of H2O2 = 34; mol. wt. of
KMnO4 = 158)
INTEGER+4 / -02020
43Some Basic Concepts Of Chemistry
Consider the following equations :
2Fe2+ + H2O2 \(\to\) xA + yB
(in basic medium)
2MnO4- + 6H+ + 5H2O2 \(\to\) x'C + y'D + z'E
(in acidic medium)
The sum of the stoichiometric coefficients
x, y, x', y', and z' for products A, B, C, D ...
2Fe2+ + H2O2 \(\to\) xA + yB
(in basic medium)
2MnO4- + 6H+ + 5H2O2 \(\to\) x'C + y'D + z'E
(in acidic medium)
The sum of the stoichiometric coefficients
x, y, x', y', and z' for products A, B, C, D ...
INTEGER+4 / -02020
44Some Basic Concepts Of Chemistry
The volume strength of 8.9 M H2O2
solution calculated at 273 K and 1 atm is ______. (R = 0.0821 L
atm K-1 mol-1) (rounded off ot the nearest integer)
solution calculated at 273 K and 1 atm is ______. (R = 0.0821 L
atm K-1 mol-1) (rounded off ot the nearest integer)
INTEGER+4 / -02020
45Some Basic Concepts Of Chemistry
The mole fraction of glucose (C6H12O6
) in an aqueous binary solution is 0.1. The mass percentage of
water in it, to the nearest integer, is _______.
) in an aqueous binary solution is 0.1. The mass percentage of
water in it, to the nearest integer, is _______.
INTEGER+4 / -02020
46Some Basic Concepts Of Chemistry
6.023 \(\times\) 1022 molecules are present in 10 g of a substance 'x'. The molarity of a solution containing
5 g of substance 'x' in 2 L solution is _____ × 10-3
5 g of substance 'x' in 2 L solution is _____ × 10-3
INTEGER+4 / -02020
47Some Basic Concepts Of Chemistry
The strengths of 5.6 volume hydrogen peroxide
(of density 1 g/mL) in terms of mass percentage
and molarity (M), respectively, are:
(Take molar mass of hydrogen peroxide as
34 g/mol)
(of density 1 g/mL) in terms of mass percentage
and molarity (M), respectively, are:
(Take molar mass of hydrogen peroxide as
34 g/mol)
MCQ+4 / -12020
48Some Basic Concepts Of Chemistry
The volume (in mL) of 0.1 N NaOH required to neutralise 10 mL of 0.1 N phosphinic acid is ___________.
INTEGER+4 / -02020
49Some Basic Concepts Of Chemistry
The ratio of the mass percentages of ‘C & H’
and ‘C & O’ of a saturated acyclic organic
compound ‘X’ are 4 : 1 and 3 : 4 respectively.
Then, the moles of oxygen gas required for
complete combustion of two moles of organic
compound ‘X’ is __...
and ‘C & O’ of a saturated acyclic organic
compound ‘X’ are 4 : 1 and 3 : 4 respectively.
Then, the moles of oxygen gas required for
complete combustion of two moles of organic
compound ‘X’ is __...
INTEGER+4 / -02020
50Some Basic Concepts Of Chemistry
A solution of sodium sulphate contains 92 g of Na+ ions per kilogram of water. The molality of Na+ ions in that solution in mol kg\(-\)1 is :
MCQ+4 / -12019