Chemistry Syllabus (JEE Main)

Inorganic Chemistry Organic Chemistry Physical Chemistry

Q. What is the maximum number of electrons that can occupy a single p-orbital?

A. 2
B. 6
C. 10
D. 14

Solution

A single p-orbital can hold a maximum of 2 electrons.

Correct Answer: A — 2

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Q. What is the maximum number of electrons that can occupy a subshell with the quantum number l = 2?

A. 2
B. 6
C. 10
D. 14

Solution

The maximum number of electrons in a subshell is given by the formula 2(2l + 1). For l = 2, this gives 2(2*2 + 1) = 10.

Correct Answer: C — 10

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Q. What is the maximum number of electrons that can occupy a subshell with the quantum numbers n=3 and l=2?

A. 2
B. 6
C. 10
D. 14

Solution

The maximum number of electrons in a subshell is given by the formula 2(2l + 1). For l=2, this gives 2(2*2 + 1) = 10.

Correct Answer: C — 10

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Q. What is the maximum number of electrons that can occupy the 3rd energy level?

A. 2
B. 8
C. 18
D. 32

Solution

The maximum number of electrons in an energy level is given by the formula 2n^2. For n=3, it is 2(3^2) = 18.

Correct Answer: C — 18

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Q. What is the maximum number of electrons that can occupy the n=3 shell?

A. 2
B. 8
C. 18
D. 32

Solution

The maximum number of electrons in a shell is given by the formula 2n^2. For n=3, it is 2(3^2) = 18.

Correct Answer: C — 18

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Q. What is the maximum number of orbitals in a subshell where l = 1?

A. 1
B. 3
C. 5
D. 7

Solution

For l=1, the number of orbitals is given by 2l + 1 = 3.

Correct Answer: B — 3

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Q. What is the maximum number of orbitals in a subshell with l = 3?

A. 3
B. 5
C. 7
D. 9

Solution

The number of orbitals in a subshell is given by 2l + 1. For l = 3, it is 2*3 + 1 = 7.

Correct Answer: C — 7

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Q. What is the maximum oxidation state exhibited by manganese?

A. +2
B. +4
C. +6
D. +7

Solution

Manganese can exhibit a maximum oxidation state of +7 in compounds like KMnO4.

Correct Answer: D — +7

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Q. What is the maximum oxidation state of the element in group 14?

A. +2
B. +4
C. +6
D. +8

Solution

The maximum oxidation state of group 14 elements, such as Carbon and Silicon, is +4.

Correct Answer: C — +6

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Q. What is the maximum value of the magnetic quantum number (m_l) when l = 3?

A. 3
B. 2
C. 1
D. 0

Solution

The magnetic quantum number m_l can take values from -l to +l. For l = 3, m_l can be -3, -2, -1, 0, +1, +2, +3, giving a maximum value of 3.

Correct Answer: A — 3

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Q. What is the molality of a solution containing 3 moles of KCl dissolved in 1 kg of water?

A. 3 m
B. 1.5 m
C. 2 m
D. 4 m

Solution

Molality (m) = moles of solute / kg of solvent = 3 moles / 1 kg = 3 m.

Correct Answer: A — 3 m

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Q. What is the molality of a solution prepared by dissolving 3 moles of KCl in 1 kg of water?

A. 3 m
B. 1.5 m
C. 2 m
D. 4 m

Solution

Molality (m) = moles of solute / kg of solvent = 3 moles / 1 kg = 3 m.

Correct Answer: A — 3 m

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Q. What is the molality of a solution prepared by dissolving 5 moles of NaCl in 2 kg of water?

A. 2.5 mol/kg
B. 5 mol/kg
C. 1.5 mol/kg
D. 3 mol/kg

Solution

Molality (m) = moles of solute / mass of solvent (kg) = 5 moles / 2 kg = 2.5 mol/kg.

Correct Answer: A — 2.5 mol/kg

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Q. What is the molar mass of CaCO3?

A. 100 g/mol
B. 120 g/mol
C. 80 g/mol
D. 60 g/mol

Solution

Molar mass of CaCO3 = 40 + 12 + 16*3 = 100 g/mol.

Correct Answer: A — 100 g/mol

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Q. What is the molar mass of sulfuric acid (H2SO4)?

A. 98 g/mol
B. 96 g/mol
C. 100 g/mol
D. 92 g/mol

Solution

Molar mass = 2*1 + 32 + 4*16 = 98 g/mol.

Correct Answer: A — 98 g/mol

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Q. What is the molar mass of the product formed when 1 mole of Mg reacts with 2 moles of HCl?

A. 24.3 g
B. 36.5 g
C. 58.5 g
D. 74.5 g

Solution

Mg + 2HCl → MgCl2 + H2. Molar mass of MgCl2 = 24.3 + 2*35.5 = 95.3 g.

Correct Answer: D — 74.5 g

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Q. What is the molar mass of the product formed when 1 mole of nitrogen reacts with 3 moles of hydrogen?

A. 28 g
B. 14 g
C. 32 g
D. 18 g

Solution

N2 + 3H2 → 2NH3. Molar mass of NH3 = 14 + 3 = 17 g.

Correct Answer: A — 28 g

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Q. What is the molar mass of water (H2O)?

A. 16 g/mol
B. 18 g/mol
C. 20 g/mol
D. 22 g/mol

Solution

The molar mass of water is calculated as follows: H (1 g/mol) x 2 + O (16 g/mol) = 18 g/mol.

Correct Answer: B — 18 g/mol

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Q. What is the molar volume of an ideal gas at standard temperature and pressure (STP)?

A. 22.4 L
B. 24.5 L
C. 18.0 L
D. 30.0 L

Solution

The molar volume of an ideal gas at STP is 22.4 L.

Correct Answer: A — 22.4 L

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Q. What is the molar volume of an ideal gas at STP (Standard Temperature and Pressure)?

A. 22.4 L
B. 24.5 L
C. 18.0 L
D. 30.0 L

Solution

The molar volume of an ideal gas at STP is 22.4 L.

Correct Answer: A — 22.4 L

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Q. What is the molar volume of an ideal gas at STP?

A. 22.4 L
B. 24.5 L
C. 18.0 L
D. 30.0 L

Solution

The molar volume of an ideal gas at standard temperature and pressure (STP) is 22.4 L.

Correct Answer: A — 22.4 L

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Q. What is the molarity of a solution containing 5 moles of solute in 2 liters of solution?

A. 2.5 M
B. 5 M
C. 10 M
D. 0.5 M

Solution

Molarity (M) = moles of solute / liters of solution = 5 moles / 2 L = 2.5 M.

Correct Answer: A — 2.5 M

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Q. What is the molarity of a solution if 10 g of glucose (C6H12O6) is dissolved in 250 mL of water? (Molar mass = 180 g/mol)

A. 0.22 M
B. 0.5 M
C. 0.75 M
D. 1 M

Solution

Moles of glucose = 10 g / 180 g/mol = 0.0556 moles. Molarity = 0.0556 moles / 0.25 L = 0.222 M.

Correct Answer: A — 0.22 M

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Q. What is the molarity of a solution if 10 grams of CaCl2 is dissolved in 250 mL of solution? (Molar mass of CaCl2 = 110 g/mol)

A. 0.25 M
B. 0.5 M
C. 1 M
D. 2 M

Solution

Moles of CaCl2 = 10 g / 110 g/mol = 0.0909 moles. Molarity = 0.0909 moles / 0.25 L = 0.3636 M.

Correct Answer: B — 0.5 M

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Q. What is the molarity of a solution if 5 moles of solute are dissolved in 2 liters of solution?

A. 2.5 M
B. 5 M
C. 10 M
D. 0.5 M

Solution

Molarity (M) = moles of solute / liters of solution = 5 / 2 = 2.5 M

Correct Answer: A — 2.5 M

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Q. What is the molarity of a solution prepared by dissolving 5 moles of NaCl in 2 liters of water?

A. 2.5 M
B. 5 M
C. 10 M
D. 1 M

Solution

Molarity (M) = moles of solute / liters of solution = 5 moles / 2 L = 2.5 M.

Correct Answer: A — 2.5 M

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Q. What is the mole fraction of solute in a solution containing 2 moles of solute and 8 moles of solvent?

A. 0.2
B. 0.25
C. 0.5
D. 0.1

Solution

Mole fraction of solute = moles of solute / (moles of solute + moles of solvent) = 2 / (2 + 8) = 2 / 10 = 0.2.

Correct Answer: B — 0.25

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Q. What is the mole fraction of solute in a solution containing 3 moles of solute and 7 moles of solvent?

A. 0.3
B. 0.7
C. 0.5
D. 0.2

Solution

Mole fraction of solute = moles of solute / total moles = 3 / (3 + 7) = 0.3.

Correct Answer: A — 0.3

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Q. What is the molecular formula of benzene?

A. C6H6
B. C6H12
C. C6H10
D. C6H8

Solution

Benzene has the molecular formula C6H6, indicating it is an aromatic hydrocarbon.

Correct Answer: A — C6H6

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Q. What is the molecular formula of ethylene?

A. C2H2
B. C2H4
C. C3H6
D. C4H8

Solution

Ethylene is an alkene with the molecular formula C2H4.

Correct Answer: B — C2H4

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Chemistry Syllabus (JEE Main)

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