Preparing for the Joint Entrance Exam (JEE) can be a daunting task. With so many subjects to cover and so many topics to study, it can be challenging to know where to start. One essential topic in the JEE Mains syllabus is the Some Basic Concepts of Chemistry. In this article, we will provide 50+ MCQ questions on the Some Basic Concepts of Chemistry, along with detailed solutions to help you prepare for the JEE Mains exam.
These 50+ MCQ questions are selected by the experts of studyrate.in and these are more difficult questions, which will help you to better understand Some Basic Concepts of Chemistry JEE Mains MCQ Questions with Answers.
Some Basic Concepts of Chemistry JEE Mains MCQ
Which of the following is not a postulate of Dalton’s atomic theory?
a) Atoms are indivisible particles.
b) All atoms of the same element are identical.
c) Atoms combine in small, whole-number ratios to form compounds.
d) Atoms can be subdivided into subatomic particles.
The density of a gas is found to be 2.5 g/L at a given temperature and pressure. The molar mass of the gas is:
a) 10 g/mol
b) 20 g/mol
c) 30 g/mol
d) 40 g/mol
Which of the following is not a colligative property of a solution?
a) Vapor pressure lowering
b) Boiling point elevation
c) Freezing point depression
d) Osmotic pressure
The empirical formula of a compound is CH2O, and its molecular weight is 180 g/mol. The molecular formula of the compound is:
a) C2H4O2
b) C3H6O3
c) C4H8O4
d) C5H10O5
The number of moles of CO2 produced when 1 mole of C2H4 is completely burned in excess oxygen is:
a) 1 mole
b) 2 moles
c) 3 moles
d) 4 moles
The percentage composition of a compound is found to be 40% carbon, 6.67% hydrogen, and 53.33% oxygen by mass. The empirical formula of the compound is:
a) CH2O
b) C2H4O2
c) C3H6O3
d) C4H8O4
Avogadro’s hypothesis is related to which of the following concepts?
a) Molar mass
b) Stoichiometry
c) Ideal gas equation
d) Empirical formula
The volume occupied by 1 mole of any gas at STP is:
a) 22.4 L
b) 24.5 L
c) 28.3 L
d) 30.5 L
The percentage of oxygen in sodium peroxide (Na2O2) is:
a) 16%
b) 32%
c) 48%
d) 64%
Which of the following statements about the ideal gas equation is incorrect?
a) The equation is PV = nRT.
b) The equation relates the pressure, volume, temperature, and number of moles of a gas.
c) The gas constant (R) has a value of 8.314 J/(mol·K).
d) The equation is only valid for ideal gases.
The empirical formula of a compound is CH, and its molar mass is 78 g/mol. The molecular formula of the compound is:
a) CH2
b) C2H2
c) C3H3
d) C4H4
The percent by mass of carbon in methane (CH4) is:
a) 12%
b) 25%
c) 50%
d) 75%
The ratio of the actual yield to the theoretical yield, multiplied by 100, gives the:
a) Percent yield
b) Molar yield
c) Empirical yield
d) Stoichiometric yield
Which of the following gases will diffuse the fastest at the same temperature and pressure?
a) H2
b) CO2
c) N2
d) O2
The empirical formula of a compound is C3H7O2, and its molar mass is 122 g/mol. The molecular formula of the compound is:
a) C6H14O4
b) C9H21O6
c) C12H28O8
d) C15H35O10
The mass of 1 mole of carbon-12 atoms is:
a) 1 g
b) 6 g
c) 12 g
d) 24 g
The number of moles in 32 g of sulfuric acid (H2SO4) is:
a) 0.5 moles
b) 1 mole
c) 2 moles
d) 4 moles
The empirical formula of a compound is CH, and its percent by mass of hydrogen is 6.25%. The molecular formula of the compound is:
a) CH2
b) C2H2
c) C3H3
d) C4H4
The molecular formula of a compound is C2H4O2, and its molar mass is 88 g/mol. The empirical formula of the compound is:
a) CH2O
b) C2H4O2
c) C3H6O3
d) C4H8O4
The mass of 1 mole of water (H2O) is:
a) 18 g
b) 36 g
c) 55 g
d) 72 g
The molar mass of potassium permanganate (KMnO4) is:
a) 58.5 g/mol
b) 96 g/mol
c) 158.03 g/mol
d) 228 g/mol
The number of atoms in 1 mole of any substance is:
a) 6.02 × 10^23
b) 6.02 × 10^24
c) 6.02 × 10^25
d) 6.02 × 10^26
The percentage of nitrogen in ammonium sulfate [(NH4)2SO4] is:
a) 14%
b) 28%
c) 42%
d) 56%
The molecular formula of glucose is C6H12O6. The empirical formula of glucose is:
a) CH2O
b) C2H4O2
c) C3H6O3
d) C6H12O6
Which of the following represents Avogadro’s number?
a) 6.02 × 10^20
b) 6.02 × 10^21
c) 6.02 × 10^22
d) 6.02 × 10^23
The molecular formula of a compound is C8H16O4, and its molar mass is 176 g/mol. The empirical formula of the compound is:
a) CH2O
b) C2H4O2
c) C4H8O4
d) C8H16O4
The percentage of nitrogen in ammonia (NH3) is:
a) 14%
b) 28%
c) 42%
d) 56%
The number of atoms in 1 mole of oxygen gas (O2) is:
a) 6.02 × 10^23
b) 1.204 × 10^24
c) 2.408 × 10^24
d) 3.612 × 10^24
The percent by mass of hydrogen in water (H2O) is:
a) 1%
b) 10%
c) 20%
d) 50%
The molar mass of glucose (C6H12O6) is:
a) 90 g/mol
b) 108 g/mol
c) 180 g/mol
d) 360 g/mol
We hope there JEE MCQ of Class 11 Some Basic Concepts of Chemistry will help you to score an excellent rank in JEE Mains and Advanced. If you have any queries feel free to write in the comments section. We at Study Rate are always ready to serve our students.
