Some Basic Concepts of Chemistry PYQs - Last 5 Years
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Practice 144 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 5 Years Some Basic Concepts of Chemistry Questions
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1Some Basic Concepts Of Chemistry
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MCQ+4 / -12026
2Some Basic Concepts Of Chemistry
An oxide of iron contains $69.9 \%$ iron, its empirical formula, is :
(Given : Molar mass of Fe and O are 56 and $16 \mathrm{~g} \mathrm{~mol}^{-1}$ respectively.)
(Given : Molar mass of Fe and O are 56 and $16 \mathrm{~g} \mathrm{~mol}^{-1}$ respectively.)
MCQ+4 / -12026
3Some Basic Concepts Of Chemistry
Which of the following contain the same number of atoms?
(Given : Molar mass in $\mathrm{g} \mathrm{mol}^{-1}$ of $\mathrm{H}, \mathrm{He}, \mathrm{O}$ and S are 1, 4, 16 and 32 respectively)
A. 2 g of $\mathrm{O}_2$ gas
B. 4 g of $\mathrm{...
(Given : Molar mass in $\mathrm{g} \mathrm{mol}^{-1}$ of $\mathrm{H}, \mathrm{He}, \mathrm{O}$ and S are 1, 4, 16 and 32 respectively)
A. 2 g of $\mathrm{O}_2$ gas
B. 4 g of $\mathrm{...
MCQ+4 / -12026
4Some Basic Concepts Of Chemistry
What is the mole fraction of water in $10 \%$ by weight $(\mathrm{w} / \mathrm{w})$ of aqueous urea solution?
[Given: Molar mass of $\mathrm{H}, \mathrm{O}, \mathrm{C}$ and N are $1,16,12$ and $14 \mathrm{~g} \mathrm{~mol}^{-1}$ respectivel...
[Given: Molar mass of $\mathrm{H}, \mathrm{O}, \mathrm{C}$ and N are $1,16,12$ and $14 \mathrm{~g} \mathrm{~mol}^{-1}$ respectivel...
MCQ+4 / -12026
5Some Basic Concepts Of Chemistry
How many grams of residue is obtained by heating 2.76 g of silver carbonate?
(Given : Molar mass of $\mathrm{C}, \mathrm{O}$ and Ag are 12, 16 and $108 \mathrm{~g} \mathrm{~mol}^{-1}$ respectively)
(Given : Molar mass of $\mathrm{C}, \mathrm{O}$ and Ag are 12, 16 and $108 \mathrm{~g} \mathrm{~mol}^{-1}$ respectively)
MCQ+4 / -12026
6Some Basic Concepts Of Chemistry
What volume of hydrogen gas at STP would be liberated by action of 50 mL of $\mathrm{H}_2 \mathrm{SO}_4$ of $50 \%$ purity (density $=1.3 \mathrm{~g} \mathrm{~mL}^{-1}$ ) on 20 g of zinc?
Given : Molar mass of $\mathrm{H}, \mathrm{O}, \math...
Given : Molar mass of $\mathrm{H}, \mathrm{O}, \math...
MCQ+4 / -12026
7Some Basic Concepts Of Chemistry
Number of moles and number of molecules in 1.4187 L of $\mathrm{SO}_2$ at STP respectively are
MCQ+4 / -12026
8Some Basic Concepts Of Chemistry
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 :
(A) 2 moles of cyclohexane
(B) 684 g of sucrose
(C) 90.8 L of dihydrogen at STP
is :
MCQ+4 / -12026
9Some Basic Concepts Of Chemistry
The mass of iron converted into Fe3O4 by the action of 18 g of steam is:
(Given: Molar mass of H, O and Fe are 1, 16 and 56 g mol−1 respectively)
Assume iron is present in excess:
(Given: Molar mass of H, O and Fe are 1, 16 and 56 g mol−1 respectively)
Assume iron is present in excess:
MCQ+4 / -12026
10Some Basic Concepts Of Chemistry
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 burnt in oxygen is : (Given : Molar mass in g mol–1 C : 12, H...
MCQ+4 / -12026
11Some Basic Concepts Of Chemistry
For the given reaction;CaCO3 + 2HCl → CaCl2 + H2O + CO2If 90 g 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 ...
MCQ+4 / -12026
12Some Basic Concepts Of Chemistry
0.25 g of an organic compound "A" containing carbon, hydrogen and oxygen was analysed using the combustion method. There was an increase in mass of $\mathrm{CaCl}_2$ tube and potash tube at the end of the experiment. The amount was found to...
INTEGER+4 / -12026
13Some Basic Concepts Of Chemistry
$x $ $\mathrm{mg}$ of pure HCl was used to make an aqueous solution. 25.0 mL of $0.1 \mathrm{M} \mathrm{Ba}(\mathrm{OH})_2$ solution is used when the HCl solution was titrated against it. The numerical value of $x$ is $\_\_\_\_$ $\times 10^...
INTEGER+4 / -12026
14Some Basic Concepts Of Chemistry
In the reaction,
\(2 \mathrm{Al}(\mathrm{~s})+6 \mathrm{HCl}(\mathrm{aq}) \rightarrow 2 \mathrm{Al}^{3+}(\mathrm{aq})+6 \mathrm{Cl}^{-}(\mathrm{aq})+3 \mathrm{H}_2(\mathrm{~g})\)
\(2 \mathrm{Al}(\mathrm{~s})+6 \mathrm{HCl}(\mathrm{aq}) \rightarrow 2 \mathrm{Al}^{3+}(\mathrm{aq})+6 \mathrm{Cl}^{-}(\mathrm{aq})+3 \mathrm{H}_2(\mathrm{~g})\)
MCQ+4 / -12026
15Some Basic Concepts Of Chemistry
$\mathrm{A}+2 \mathrm{~B} \longrightarrow \mathrm{AB}_2$
36.0 g of 'A' (Molar mass : $60 \mathrm{~g} \mathrm{~mol}^{-1}$ ) and 56.0 g of ' B ' (Molar mass : $80 \mathrm{~g} \mathrm{~mol}^{-1}$ ) are allowed to react. Which of the following ...
36.0 g of 'A' (Molar mass : $60 \mathrm{~g} \mathrm{~mol}^{-1}$ ) and 56.0 g of ' B ' (Molar mass : $80 \mathrm{~g} \mathrm{~mol}^{-1}$ ) are allowed to react. Which of the following ...
MCQ+4 / -12026
16Some Basic Concepts Of Chemistry
Identify the correct statements :
A. Hydrated salts can be used as primary standard.
B. Primary standard should not undergo any reaction with air.
C. Reactions of primary standard with another substance should be instantaneous and stoichiom...
A. Hydrated salts can be used as primary standard.
B. Primary standard should not undergo any reaction with air.
C. Reactions of primary standard with another substance should be instantaneous and stoichiom...
MCQ+4 / -12026
17Some Basic Concepts Of Chemistry
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 $\mathrm{g} \mathrm{mol}^{-1}$ of $\mathrm{Ca}-40, \mathrm{Cl}-35.5, \mathrm{...
[Given : Molar mass in $\mathrm{g} \mathrm{mol}^{-1}$ of $\mathrm{Ca}-40, \mathrm{Cl}-35.5, \mathrm{...
MCQ+4 / -12026
18Some Basic Concepts Of Chemistry
Aqueous HCl reacts with MnO2(s) to form MnCl2(aq), Cl2(g), and H2O(l). What is the weight (in g) of Cl2 liberated when 8.7 g of MnO2(s) is reacted with excess aqueous HCl solution? (Given Molar mass in g mol−1 Mn = 55, Cl = 35.5, O = 16, H ...
MCQ+4 / -12026
19Some Basic Concepts Of Chemistry
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 Integer value) (Given : Na = 23, I = 127, Ag = 108, N = 14, O =...
INTEGER+4 / -12025
20Some Basic Concepts Of Chemistry
On combustion 0.210 g of an organic compound containing C, H and O gave 0.127 g H2O and 0.307 g CO2. The percentages of hydrogen and oxygen in the given organic compound respectively are:
MCQ+4 / -12025
21Some Basic Concepts Of Chemistry
Thyroxine, the hormone has given below structure
The percentage of iodine in thyroxine is __________ %. (nearest integer)
(Given molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{O}: 16, \mathrm{~N}: 14, \m...
The percentage of iodine in thyroxine is __________ %. (nearest integer)
(Given molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{O}: 16, \mathrm{~N}: 14, \m...
INTEGER+4 / -12025
22Some Basic Concepts Of Chemistry
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 $\mathrm{g} \mathrm{mol}^{-1}$ ...
(Given molar mass in $\mathrm{g} \mathrm{mol}^{-1}$ ...
INTEGER+4 / -12025
23Some Basic Concepts Of Chemistry
Butane reacts with oxygen to produce carbon dioxide and water following the equation given below.
$$ \mathrm{C}_4 \mathrm{H}_{10}(\mathrm{~g})+\frac{13}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow 4 \mathrm{CO}_2(\mathrm{~g})+5 \mathrm{H}_2 \m...
$$ \mathrm{C}_4 \mathrm{H}_{10}(\mathrm{~g})+\frac{13}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow 4 \mathrm{CO}_2(\mathrm{~g})+5 \mathrm{H}_2 \m...
INTEGER+4 / -12025
24Some Basic Concepts Of Chemistry
Fortification of food with iron is done using $\mathrm{FeSO}_4 \cdot 7 \mathrm{H}_2 \mathrm{O}$. The mass in grams of the $\mathrm{FeSO}_4$. $7 \mathrm{H}_2 \mathrm{O}$ required to achieve 12 ppm of iron in 150 kg of wheat is ______ (Neares...
INTEGER+4 / -12025
25Some Basic Concepts Of Chemistry
The amount of calcium oxide produced on heating 150 kg limestone ( $75 \%$ pure) is
_________ kg. (Nearest integer)
Given: Molar mass (in $\mathrm{g} \mathrm{mol}^{-1}$ ) of Ca-40, O-16, C-12
_________ kg. (Nearest integer)
Given: Molar mass (in $\mathrm{g} \mathrm{mol}^{-1}$ ) of Ca-40, O-16, C-12
INTEGER+4 / -12025
26Some Basic Concepts Of Chemistry
0.5 g of an organic compound on combustion gave 1.46 g of $\mathrm{CO}_2$ and 0.9 g of $\mathrm{H}_2 \mathrm{O}$. The percentage of carbon in the compound is _______________. (Nearest integer)
[Given : Molar mass (in $\left.\mathrm{g} \math...
[Given : Molar mass (in $\left.\mathrm{g} \math...
INTEGER+4 / -12025
27Some Basic Concepts Of Chemistry
\(\text {During estimation of nitrogen by Dumas' method of compound } \mathrm{X}(0.42 \mathrm{~g})\)
_________mL of $\mathrm{N}_2$ gas will be liberated at STP. (nearest integer) (Given molar mass in $\mathrm{g}~ \mathrm{mol}^{-1}: \mathr...
_________mL of $\mathrm{N}_2$ gas will be liberated at STP. (nearest integer) (Given molar mass in $\mathrm{g}~ \mathrm{mol}^{-1}: \mathr...
INTEGER+4 / -12025
28Some Basic Concepts Of Chemistry
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 Pt
Element: $\mathrm{Pb}, \mathrm{Po}, \mathrm{Pr}$ and Pt
MCQ+4 / -12025
29Some Basic Concepts Of Chemistry
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 $24 \mathrm{~g} \mathrm{~mol}^{-1}$.
Given: Molar mass of Mg is $24 \mathrm{~g} \mathrm{~mol}^{-1}$.
MCQ+4 / -12025
30Some Basic Concepts Of Chemistry
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 ...
MCQ+4 / -12025
31Some Basic Concepts Of Chemistry
In Dumas' method for estimation of nitrogen 0.4 g of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the compound is
(Given : Aqueous tension at $30...
(Given : Aqueous tension at $30...
MCQ+4 / -12025
32Some Basic Concepts Of Chemistry
X g of nitrobenzene on nitration gave 4.2 g of m -dinitrobenzene. X = __________g. (nearest integer)
[Given : molar mass (in $\left.\left.\mathrm{g} \mathrm{mol}^{-1}\right) \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{O}: 16, \mathrm{~N}: 14\rig...
[Given : molar mass (in $\left.\left.\mathrm{g} \mathrm{mol}^{-1}\right) \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{O}: 16, \mathrm{~N}: 14\rig...
INTEGER+4 / -12025
33Some Basic Concepts Of Chemistry
\(\mathrm{CaCO}_3(\mathrm{~s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{CaCl}_2(\mathrm{aq})+\mathrm{CO}_2(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(\mathrm{l})\)
Consider the above reaction, what mass of $\mathrm{CaCl}_2$ will be formed ...
Consider the above reaction, what mass of $\mathrm{CaCl}_2$ will be formed ...
MCQ+4 / -12025
34Some Basic Concepts Of Chemistry
On complete combustion 1.0 g of an organic compound $(\mathrm{X})$ gave 1.46 g of $\mathrm{CO}_2$ and 0.567 g of $\mathrm{H}_2 \mathrm{O}$. The empirical formula mass of compound $(\mathrm{X})$ is __________ g. (Given molar mass in $\mathrm...
MCQ+4 / -12025
35Some 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°C are pos...
MCQ+4 / -12025
36Some Basic Concepts Of Chemistry
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 $(\mathrm{X})$ is _________ $\times 10^{-1}$
(Given molar mass in $\mathrm{g} \mathrm...
C : $14.5 \%$
Cl : 64.46%
H: 1.8 %
(Empirical formula mass of the compound $(\mathrm{X})$ is _________ $\times 10^{-1}$
(Given molar mass in $\mathrm{g} \mathrm...
INTEGER+4 / -12025
37Some Basic Concepts Of Chemistry
The molarity of a $70 \%$ (mass/mass) aqueous solution of a monobasic acid (X) is _________ $\times 10^{-1}$ M (Nearest integer)
[Given: Density of aqueous solution of (X) is $1.25 \mathrm{~g} \mathrm{~mL}^{-1}$
Molar mass of the acid is $7...
[Given: Density of aqueous solution of (X) is $1.25 \mathrm{~g} \mathrm{~mL}^{-1}$
Molar mass of the acid is $7...
INTEGER+4 / -12025
38Some Basic Concepts Of Chemistry
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 $1.25 \mathrm{~g} / \mathrm{mL}$.
Given : Density of nitric acid solution is $1.25 \mathrm{~g} / \mathrm{mL}$.
MCQ+4 / -12025
39Some Basic Concepts Of Chemistry
Xg of benzoic acid on reaction with aq $\mathrm{NaHCO}_3$ released $\mathrm{CO}_2$ that occupied 11.2 L volume at STP.
X is _________ g.
X is _________ g.
INTEGER+4 / -12025
40Some Basic Concepts Of Chemistry
Consider the following reaction occurring in the blast furnace:
\(\mathrm{Fe}_3 \mathrm{O}_{4(\mathrm{~s})}+4 \mathrm{CO}_{(\mathrm{g})} \rightarrow 3 \mathrm{Fe}_{(\mathrm{l})}+4 \mathrm{CO}_{2(\mathrm{~g})}\)
' $x$ ' kg of iron is produce...
\(\mathrm{Fe}_3 \mathrm{O}_{4(\mathrm{~s})}+4 \mathrm{CO}_{(\mathrm{g})} \rightarrow 3 \mathrm{Fe}_{(\mathrm{l})}+4 \mathrm{CO}_{2(\mathrm{~g})}\)
' $x$ ' kg of iron is produce...
INTEGER+4 / -12025
41Some Basic Concepts Of Chemistry
The elemental composition of a compound is $54.2 \% \mathrm{C}, 9.2 \% \mathrm{H}$ and $36.6 \% \mathrm{O}$.
If the molar mass of the compound is $132 \mathrm{~g} \mathrm{~mol}^{-1}$, the molecular formula of the compound is :
[Given : The ...
If the molar mass of the compound is $132 \mathrm{~g} \mathrm{~mol}^{-1}$, the molecular formula of the compound is :
[Given : The ...
MCQ+4 / -12025
42Some Basic Concepts Of Chemistry
During " S " estimation, 160 mg of an organic compound gives 466 mg of barium sulphate. The percentage of Sulphur in the given compound is _________ %.
(Given molar mass in $\mathrm{g} \mathrm{~mol}^{-1}$ of $\mathrm{Ba}: 137, \mathrm{~S}: ...
(Given molar mass in $\mathrm{g} \mathrm{~mol}^{-1}$ of $\mathrm{Ba}: 137, \mathrm{~S}: ...
INTEGER+4 / -12025
43Some Basic Concepts Of Chemistry
$2.8 \times 10^{-3} \mathrm{~mol}$ 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}^{-...
Given: $\mathrm{N}_{\mathrm{A}}=6.02 \times 10^{23} \mathrm{~mol}^{-...
MCQ+4 / -12025
44Some Basic Concepts Of Chemistry
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 $27.0 \mathrm{~g} \mathrm{~mol}^{-1}$
Molar mass of O is $16....
Given :
Molar mass of Al is $27.0 \mathrm{~g} \mathrm{~mol}^{-1}$
Molar mass of O is $16....
INTEGER+4 / -12025
45Some Basic Concepts Of Chemistry
0.01 mole of an organic compound $(X)$ containing $10 \%$ hydrogen, on complete combustion produced $0.9 \mathrm{~g} \mathrm{H}_2 \mathrm{O}$. Molar mass of $(\mathrm{X})$ is _________ $\mathrm{g} \mathrm{~mol}^{-1}$.
INTEGER+4 / -12025
46Some Basic Concepts Of Chemistry
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 _________ $\times 10^{-2} \mathrm{M}$. (Nearest integer)
INTEGER+4 / -12025
47Some Basic Concepts Of Chemistry
Density of 3 M NaCl solution is $1.25 \mathrm{~g} / \mathrm{mL}$. The molality of the solution is :
MCQ+4 / -12025
48Some Basic Concepts Of Chemistry
Molarity \((\mathrm{M})\) of an aqueous solution containing \(x \mathrm{~g}\) of anhyd. \(\mathrm{CuSO}_4\) in \(500 \mathrm{~mL}\) solution at \(32^{\circ} \mathrm{C}\) is \(2 \times 10^{-1} \mathrm{M}\). Its molality will be _________ $$...
INTEGER+4 / -12024
49Some Basic Concepts Of Chemistry
Combustion of glucose \((\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6)\) produces \(\mathrm{CO}_2\) and water. The amount of oxygen (in \(\mathrm{g}\)) required for the complete combustion of \(900 \mathrm{~g}\) of glucose is :
[Molar mass of ...
[Molar mass of ...
MCQ+4 / -12024
50Some Basic Concepts Of Chemistry
Molality of an aqueous solution of urea is \(4.44 \mathrm{~m}\). Mole fraction of urea in solution is \(x \times 10^{-3}\), Value of \(x\) is ________. (Integer answer)
INTEGER+4 / -12024