Some Basic Concepts of Chemistry PYQs - Last 10 Years
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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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Last 10 Years Some Basic Concepts of Chemistry Questions
Showing 50 of 223 filtered questions.
1Some Basic Concepts Of Chemistry
An organic compound gives \(0.220 \mathrm{~g}\) of \(\mathrm{CO}_{2}\) and \(0.126 \mathrm{~g}\) of \(\mathrm{H}_{2} \mathrm{O}\) on complete combustion. If the \(\%\) of carbon is 24 then the \(\%\) of hydrogen is __________ $$\times 10^{-...
INTEGER+4 / -12023
2Some Basic Concepts Of Chemistry
\(1 \mathrm{~g}\) of a carbonate \(\left(\mathrm{M}_{2} \mathrm{CO}_{3}\right)\) on treatment with excess \(\mathrm{HCl}\) produces \(0.01 \mathrm{~mol}\) of \(\mathrm{CO}_{2}\). The molar mass of \(\mathrm{M}_{2} \mathrm{CO}_{3}\) is _____...
INTEGER+4 / -12023
3Some Basic Concepts Of Chemistry
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 $$35.5 \ma...
(Given: Atomic mass of chlorine is $$35.5 \ma...
MCQ+4 / -12023
4Some Basic Concepts Of Chemistry
A solution of sugar is obtained by mixing \(200 \mathrm{~g}\) of its \(25 \%\) solution and \(500 \mathrm{~g}\) of its \(40 \%\) solution (both by mass). The mass percentage of the resulting sugar solution is ___________ (Nearest integer)
INTEGER+4 / -12023
5Some Basic Concepts Of Chemistry
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 mag...
Given : Molar volume of gas is \(22.4 \mathrm{~L}\) at STP.
Molar mass of mag...
INTEGER+4 / -12023
6Some Basic Concepts Of Chemistry
A solution is prepared by adding \(2 \mathrm{~g}\) of "\(\mathrm{X}\)" to 1 mole of water. Mass percent of "\(\mathrm{X}\)" in the solution is :
MCQ+4 / -12023
7Some Basic Concepts Of Chemistry
The number of molecules and moles in 2.8375 litres of O\(_2\) at STP are respectively
MCQ+4 / -12023
8Some Basic Concepts Of Chemistry
Match List I with List II
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MCQ+4 / -12023
9Some Basic Concepts Of Chemistry
Given below are two statements: one is labelled as Assertion \(\mathbf{A}\) and the other is labelled as Reason \(\mathbf{R}\)
Assertion A : \(3.1500 \mathrm{~g}\) of hydrated oxalic acid dissolved in water to make \(250.0 \mathrm{~mL}\) so...
Assertion A : \(3.1500 \mathrm{~g}\) of hydrated oxalic acid dissolved in water to make \(250.0 \mathrm{~mL}\) so...
MCQ+4 / -12023
10Some Basic Concepts Of Chemistry
Blister copper is produced by reaction of copper oxide with copper sulphide.
2Cu2O + Cu2S \(\to\) 6Cu + SO2
When 2.86 \(\times\) 103 g of Cu2O and 4.77 \(\times\) 103 g of Cu2S are used for reaction, the mass of copper produced is _________...
2Cu2O + Cu2S \(\to\) 6Cu + SO2
When 2.86 \(\times\) 103 g of Cu2O and 4.77 \(\times\) 103 g of Cu2S are used for reaction, the mass of copper produced is _________...
INTEGER+4 / -12022
11Some Basic Concepts Of Chemistry
Production of iron in blast furnace follows the following equation
Fe3O4(s) + 4CO(g) \(\to\) 3Fe(l) + 4CO2(g)
when 4.640 kg of Fe3O4 and 2.520 kg of CO are allowed to react then the amount of iron (in g) produced is :
[Given : Molar Atomic ...
Fe3O4(s) + 4CO(g) \(\to\) 3Fe(l) + 4CO2(g)
when 4.640 kg of Fe3O4 and 2.520 kg of CO are allowed to react then the amount of iron (in g) produced is :
[Given : Molar Atomic ...
MCQ+4 / -12022
12Some Basic Concepts Of Chemistry
Using the rules for significant figures, the correct answer for the expression \({{0.02858 \times 0.112} \over {0.5702}}\) will be
MCQ+4 / -12022
13Some Basic Concepts Of Chemistry
\(\mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{NH}_{3(\mathrm{~g})}\)
\(20 \mathrm{~g} \quad ~~~5 \mathrm{~g}\)
Consider the above reaction, the limiting reagent of the reaction and number of mole...
\(20 \mathrm{~g} \quad ~~~5 \mathrm{~g}\)
Consider the above reaction, the limiting reagent of the reaction and number of mole...
MCQ+4 / -12022
14Some Basic Concepts Of Chemistry
A 1.84 mg sample of polyhydric alcoholic compound 'X' of molar mass 92.0 g/mol gave 1.344 mL of \(\mathrm{H}_{2}\) gas at STP. The number of alcoholic hydrogens present in compound 'X' is ________.
INTEGER+4 / -12022
15Some Basic Concepts Of Chemistry
$$
\begin{aligned}
&\mathrm{C}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+400 \mathrm{~kJ} \\
&\mathrm{C}(\mathrm{s})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}(\mathrm{g})+100 \mat...
\begin{aligned}
&\mathrm{C}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+400 \mathrm{~kJ} \\
&\mathrm{C}(\mathrm{s})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}(\mathrm{g})+100 \mat...
MCQ+4 / -12022
16Some Basic Concepts Of Chemistry
Consider the reaction
\(4 \mathrm{HNO}_{3}(1)+3 \mathrm{KCl}(\mathrm{s}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})+\mathrm{NOCl}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})+3 \mathrm{KNO}_{3}(\mathrm{~s})\)
The amount of $$\mathrm{HN...
\(4 \mathrm{HNO}_{3}(1)+3 \mathrm{KCl}(\mathrm{s}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})+\mathrm{NOCl}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})+3 \mathrm{KNO}_{3}(\mathrm{~s})\)
The amount of $$\mathrm{HN...
MCQ+4 / -12022
17Some Basic Concepts Of Chemistry
The complete combustion of 0.492 g of an organic compound containing 'C', 'H' and 'O' gives 0.793 g of CO2 and 0.442 g of H2O. The percentage of oxygen composition in the organic compound is ______________. (nearest integer)
INTEGER+4 / -12022
18Some Basic Concepts Of Chemistry
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 respectively.
The molar mass of the compound A is 162 g mol\(-\)1.
Given : Atomic masses of C, H and N are 12, 1 and 14 amu respectively.
The molar mass of the compound A is 162 g mol\(-\)1.
MCQ+4 / -12022
19Some Basic Concepts Of Chemistry
On complete combustion of \(0.492 \mathrm{~g}\) of an organic compound containing \(\mathrm{C}, \mathrm{H}\) and \(\mathrm{O}\), \(0.7938 \mathrm{~g}\) of \(\mathrm{CO}_{2}\) and \(0.4428 \mathrm{~g}\) of \(\mathrm{H}_{2} \mathrm{O}\) was p...
INTEGER+4 / -12022
20Some Basic Concepts Of Chemistry
In the given reaction,
\(X+Y+3 Z \leftrightarrows X YZ_{3}\)
if one mole of each of \(X\) and \(Y\) with \(0.05 \mathrm{~mol}\) of \(Z\) gives compound \(X Y Z_{3}\). (Given : Atomic masses of \(X, Y\) and \(Z\) are 10, 20 and 30 amu, respe...
\(X+Y+3 Z \leftrightarrows X YZ_{3}\)
if one mole of each of \(X\) and \(Y\) with \(0.05 \mathrm{~mol}\) of \(Z\) gives compound \(X Y Z_{3}\). (Given : Atomic masses of \(X, Y\) and \(Z\) are 10, 20 and 30 amu, respe...
INTEGER+4 / -12022
21Some Basic Concepts Of Chemistry
2L of 0.2M H2SO4 is reacted with 2L of 0.1M NaOH solution, the molarity of the resulting product Na2SO4 in the solution is _________ millimolar. (Nearest integer)
INTEGER+4 / -12022
22Some Basic Concepts Of Chemistry
Two elements A and B which form 0.15 moles of A2B and AB3 type compounds. If both A2B and AB3 weigh equally, then the atomic weight of A is _____________ times of atomic weight of B.
INTEGER+4 / -12022
23Some Basic Concepts Of Chemistry
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, O and C are 1, 16 and 12, respectively. The data agrees with how many formulae of the followi...
INTEGER+4 / -12022
24Some Basic Concepts Of Chemistry
\(20 \mathrm{~mL}\) of \(0.02 \,\mathrm{M} \,\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) solution is used for the titration of \(10 \mathrm{~mL}\) of \(\mathrm{Fe}^{2+}\) solution in the acidic medium.
The molarity of $$\mathrm{Fe}^{2+}...
The molarity of $$\mathrm{Fe}^{2+}...
INTEGER+4 / -12022
25Some Basic Concepts Of Chemistry
In Carius method of estimation of halogen, \(0.45 \mathrm{~g}\) of an organic compound gave \(0.36 \mathrm{~g}\) of \(\mathrm{AgBr}\). Find out the percentage of bromine in the compound.
(Molar masses : $$\mathrm{AgBr}=188 \mathrm{~g} \math...
(Molar masses : $$\mathrm{AgBr}=188 \mathrm{~g} \math...
MCQ+4 / -12022
26Some Basic Concepts Of Chemistry
\(250 \mathrm{~g}\) solution of \(\mathrm{D}\)-glucose in water contains \(10.8 \%\) of carbon by weight. The molality of the solution is nearest to
(Given: Atomic Weights are, $$\mathrm{H}, 1 \,\mathrm{u} ; \mathrm{C}, 12 \,\mathrm{u} ; \m...
(Given: Atomic Weights are, $$\mathrm{H}, 1 \,\mathrm{u} ; \mathrm{C}, 12 \,\mathrm{u} ; \m...
MCQ+4 / -12022
27Some Basic Concepts Of Chemistry
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 integer)
INTEGER+4 / -12022
28Some Basic Concepts Of Chemistry
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 = 1 amu)
(Atomic mass : Cl = 35.5 amu, H = 1 amu)
MCQ+4 / -12022
29Some Basic Concepts Of Chemistry
The moles of methane required to produce 81 g of water after complete combustion is _____________ \(\times\) 10\(-\)2 mol. [nearest integer]
INTEGER+4 / -12022
30Some Basic Concepts Of Chemistry
CNG is an important transportation fuel. When 100 g CNG is mixed with 208 g oxygen in vehicles, it leads to the formation of CO2 and H2O and produces large quantity of heat during this combustion, then the amount of carbon dioxide, produced...
INTEGER+4 / -12022
31Some Basic Concepts Of Chemistry
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 solution is x \(\times\) 10\(-\)2 M. (Nearest integer)
(Molar mass of n...
(Molar mass of n...
INTEGER+4 / -12022
32Some Basic Concepts Of Chemistry
Chlorophyll extracted from the crushed green leaves was dissolved in water to make \(2 \mathrm{~L}\) solution of Mg of concentration \(48\, \mathrm{ppm}\). The number of atoms of \(\mathrm{Mg}\) in this solution is \(x \times 10^{20}\) atom...
INTEGER+4 / -12022
33Some Basic Concepts Of Chemistry
A \(100 \mathrm{~mL}\) solution of \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{MgBr}\) on treatment with methanol produces \(2.24 \mathrm{~mL}\) of a gas at STP. The weight of gas produced is _____________ mg. [nearest integer]
INTEGER+4 / -12022
34Some Basic Concepts Of Chemistry
Hemoglobin contains \(0.34 \%\) of iron by mass. The number of Fe atoms in \(3.3 \mathrm{~g}\) of hemoglobin is
(Given: Atomic mass of Fe is \(56 \,\mathrm{u}, \mathrm{N}_{\mathrm{A}}=6.022 \times 10^{23} \mathrm{~mol}^{-1}\).)
(Given: Atomic mass of Fe is \(56 \,\mathrm{u}, \mathrm{N}_{\mathrm{A}}=6.022 \times 10^{23} \mathrm{~mol}^{-1}\).)
MCQ+4 / -12022
35Some Basic Concepts Of Chemistry
Number of grams of bromine that will completely react with 5.0 g of pent-1-ene is ___________ \(\times\) 10\(-\)2 g. (Atomic mass of Br = 80 g/mol) [Nearest Integer]
INTEGER+4 / -12022
36Some Basic Concepts Of Chemistry
1 L aqueous solution of H2SO4 contains 0.02 m mol H2SO4. 50% of this solution is diluted with deionized water to give 1 L solution (A). In solution (A), 0.01 m mol of H2SO4 are added. Total m mols of H2SO4 in the final solution is _________...
INTEGER+4 / -12022
37Some Basic Concepts Of Chemistry
The number of N atoms in 681 g of C7H5N3O6 is x \(\times\) 1021. The value of x is (NA = 6.02 \(\times\) 1023 mol\(-\)1) (Nearest Integer)
INTEGER+4 / -12022
38Some Basic Concepts Of Chemistry
A protein 'A' contains 0.30% of glycine (molecular weight 75). The minimum molar mass of the protein 'A' is __________ \(\times\) 103 g mol\(-\)1 [nearest integer]
INTEGER+4 / -12022
39Some Basic Concepts Of Chemistry
\(\mathrm{SO}_{2} \mathrm{Cl}_{2}\) on reaction with excess of water results into acidic mixture
\(\mathrm{SO}_{2} \mathrm{Cl}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{2} \mathrm{SO}_{4}+2 \mathrm{HCl}\)
16 moles of $$\math...
\(\mathrm{SO}_{2} \mathrm{Cl}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{2} \mathrm{SO}_{4}+2 \mathrm{HCl}\)
16 moles of $$\math...
MCQ+4 / -12022
40Some Basic Concepts Of Chemistry
A sample of 4.5 mg of an unknown monohydric alcohol, R-OH was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be 3.1 mL. The molecular weight of the unknown alcohol is __________ g/mol. [Nearest...
INTEGER+4 / -12022
41Some Basic Concepts Of Chemistry
56.0 L of nitrogen gas is mixed with excess hydrogen gas and it is found that 20 L of ammonia gas is produced. The volume of unused nitrogen gas is found to be _________ L.
INTEGER+4 / -12022
42Some Basic Concepts Of Chemistry
A 0.166 g sample of an organic compound was digested with conc. H2SO4 and then distilled with NaOH. The ammonia gas evolved was passed through 50.0 mL of 0.5 N H2SO4. The used acid required 30.0 mL of 0.25 N NaOH for complete neutralization...
INTEGER+4 / -12022
43Some Basic Concepts Of Chemistry
If a rocket runs on a fuel (C15H30) and liquid oxygen, the weight of oxygen required and CO2 released for every litre of fuel respectively are :
(Given : density of the fuel is 0.756 g/mL)
(Given : density of the fuel is 0.756 g/mL)
MCQ+4 / -12022
44Some Basic Concepts Of Chemistry
120 g of an organic compound that contains only carbon and hydrogen gives 330 g of CO2 and 270 g of water on complete combustion. The percentage of carbon and hydrogen, respectively are
MCQ+4 / -12022
45Some Basic Concepts Of Chemistry
The molarity of the solution prepared by dissolving 6.3 g of oxalic acid (H2C2O4.2H2O) in 250 mL of water in mol L\(-\)1 is x \(\times\) 10\(-\)2. The value of x is _____________. (Nearest integer) [Atomic mass : H : 1.0, C : 12.0, O : 16.0...
INTEGER+4 / -12021
46Some Basic Concepts Of Chemistry
Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, the concentration of the resulting NaOH solution is ______________ \(\times\) 10\(-\)1 M. (...
INTEGER+4 / -12021
47Some Basic Concepts Of Chemistry
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 mass : Na : 23.0 u, O : 16.0 u, H : 1.0 u, Density of H2O : 1.0 g cm\(-\)3]
INTEGER+4 / -12021
48Some Basic Concepts Of Chemistry
2SO2(g) + O2(g) \(\to\) 2SO3(g)The above reaction is carried out in a vessel starting with partial pressure PSO2 = 250 m bar, PO2 = 750 m bar and PSO3 = 0 bar. When the reaction is complete, the total pressure in the reaction vessel is ____...
INTEGER+4 / -12021
49Some Basic Concepts Of Chemistry
In Carius method for estimation of halogens, 0.2 g of an organic compound gave 0.188 g of AgBr. The percentage of bromine in the compound is ______________. (Nearest integer)[Atomic mass : Ag = 108, Br = 80]
INTEGER+4 / -12021
50Some Basic Concepts Of Chemistry
100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x \(\times\) 10\(-\)2. The value of x is ____________. (Nearest integer)[Atomic weight : H = 1.008; C = 12.00; O =...
INTEGER+4 / -12021