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Atomic Structure & Chemical Bonding (Chemistry) Solved Questions & Notes (2026) - Apex Rankers

Natural & Physical Sciences > Chemistry > Atomic Structure & Chemical Bonding

45 Total Solved Questions
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Atomic Structure & Chemical Bonding

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Q. 1 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
Which quantum number designates the main energy level or shell of an electron in an atom?
A
Principal Quantum Number (n)
✓ Correct
B
Azimuthal Quantum Number (l)
C
Magnetic Quantum Number (m_l)
D
Spin Quantum Number (m_s)
💡 Step-by-Step Explanation & Concept Rationale
The principal quantum number n (1, 2, 3...) determines the main shell, size of orbital, and energy level.
Q. 2 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
What rule states that electrons enter atomic orbitals of lowest available energy first before filling higher energy orbitals?
A
Aufbau Principle
✓ Correct
B
Hund's Rule of Maximum Multiplicity
C
Pauli Exclusion Principle
D
Heisenberg Uncertainty Principle
💡 Step-by-Step Explanation & Concept Rationale
The Aufbau Principle dictates progressive electron filling from 1s, 2s, 2p, 3s, etc., in order of increasing (n + l) value.
Q. 3 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the molecular geometry and bond angle of a Methane (CH4) molecule according to VSEPR theory?
A
Tetrahedral with 109.5 degree bond angles
✓ Correct
B
Trigonal planar with 120 degree bond angles
C
Linear with 180 degree bond angles
D
Octahedral with 90 degree bond angles
💡 Step-by-Step Explanation & Concept Rationale
Carbon in CH4 undergoes sp³ hybridization with four equivalent bonding pairs, yielding a symmetrical tetrahedral geometry of 109.5 degrees.
Q. 4 Chemistry (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
What type of hybridization is present in the central carbon atoms of Ethene (C2H4) and Ethyne (C2H2) respectively?
A
sp² and sp hybridization
✓ Correct
B
sp³ and sp² hybridization
C
sp and sp³ hybridization
D
dsp² and sp³d hybridization
💡 Step-by-Step Explanation & Concept Rationale
Ethene (H2C=CH2) has planar sp² hybridized carbons (one sigma, one pi bond), while Ethyne (HC≡CH) has linear sp hybridized carbons (one sigma, two pi bonds).
Q. 5 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
Which of the following molecules possesses a zero net dipole moment despite having polar covalent bonds?
A
Carbon Dioxide (CO2)
✓ Correct
B
Water (H2O)
C
Ammonia (NH3)
D
Sulfur Dioxide (SO2)
💡 Step-by-Step Explanation & Concept Rationale
CO2 is linear (O=C=O); the two equal and opposite C=O bond dipoles cancel out symmetrically, resulting in mu = 0 Debye.
Q. 6 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
Which quantum number designates the shape of an atomic orbital?
A
Azimuthal quantum number (l)
✓ Correct
B
Principal quantum number (n)
C
Magnetic quantum number (m)
D
Spin quantum number (s)
💡 Step-by-Step Explanation & Concept Rationale
The azimuthal (orbital angular momentum) quantum number l defines the subshell shape (s=spherical, p=dumbbell, d=cloverleaf).
Q. 7 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In chemical bonding theory #6: Which type of intermolecular force is responsible for the anomalously high boiling point of water and hydrogen fluoride?
A
London dispersion forces
B
Hydrogen bonding
✓ Correct
C
Dipole-induced dipole
D
Covalent coordinate bonding
💡 Step-by-Step Explanation & Concept Rationale
Hydrogen bonding is a strong dipole-dipole attraction occurring between H bonded to highly electronegative elements (N, O, F).
Q. 8 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In chemical bonding theory #11: Which type of intermolecular force is responsible for the anomalously high boiling point of water and hydrogen fluoride?
A
Dipole-induced dipole
B
London dispersion forces
C
Hydrogen bonding
✓ Correct
D
Covalent coordinate bonding
💡 Step-by-Step Explanation & Concept Rationale
Hydrogen bonding is a strong dipole-dipole attraction occurring between H bonded to highly electronegative elements (N, O, F).
Q. 9 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In chemical bonding theory #16: Which type of intermolecular force is responsible for the anomalously high boiling point of water and hydrogen fluoride?
A
Covalent coordinate bonding
B
London dispersion forces
C
Dipole-induced dipole
D
Hydrogen bonding
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Hydrogen bonding is a strong dipole-dipole attraction occurring between H bonded to highly electronegative elements (N, O, F).
Q. 10 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In chemical bonding theory #21: Which type of intermolecular force is responsible for the anomalously high boiling point of water and hydrogen fluoride?
A
Hydrogen bonding
✓ Correct
B
London dispersion forces
C
Dipole-induced dipole
D
Covalent coordinate bonding
💡 Step-by-Step Explanation & Concept Rationale
Hydrogen bonding is a strong dipole-dipole attraction occurring between H bonded to highly electronegative elements (N, O, F).
Q. 11 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In chemical bonding theory #26: Which type of intermolecular force is responsible for the anomalously high boiling point of water and hydrogen fluoride?
A
London dispersion forces
B
Hydrogen bonding
✓ Correct
C
Dipole-induced dipole
D
Covalent coordinate bonding
💡 Step-by-Step Explanation & Concept Rationale
Hydrogen bonding is a strong dipole-dipole attraction occurring between H bonded to highly electronegative elements (N, O, F).
Q. 12 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In chemical bonding theory #31: Which type of intermolecular force is responsible for the anomalously high boiling point of water and hydrogen fluoride?
A
Dipole-induced dipole
B
London dispersion forces
C
Hydrogen bonding
✓ Correct
D
Covalent coordinate bonding
💡 Step-by-Step Explanation & Concept Rationale
Hydrogen bonding is a strong dipole-dipole attraction occurring between H bonded to highly electronegative elements (N, O, F).
Q. 13 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In chemical bonding theory #36: Which type of intermolecular force is responsible for the anomalously high boiling point of water and hydrogen fluoride?
A
Covalent coordinate bonding
B
London dispersion forces
C
Dipole-induced dipole
D
Hydrogen bonding
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Hydrogen bonding is a strong dipole-dipole attraction occurring between H bonded to highly electronegative elements (N, O, F).
Q. 14 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
Across a period in the periodic table from left to right, electronegativity generally:
A
Increases
✓ Correct
B
Decreases
C
Remains constant
D
First decreases then increases
💡 Step-by-Step Explanation & Concept Rationale
Electronegativity increases across a period due to increased effective nuclear charge and decreasing atomic radius.
Q. 15 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In inorganic chemistry analysis #6: What color is produced when copper ions (Cu2+) undergo flame test identification?
A
Crimson Red
B
Blue-Green
✓ Correct
C
Golden Yellow
D
Lilac Violet
💡 Step-by-Step Explanation & Concept Rationale
Copper salts produce a characteristic green to blue-green flame due to excitation of electrons in the d-block metal ion.
Q. 16 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In inorganic chemistry analysis #11: What color is produced when copper ions (Cu2+) undergo flame test identification?
A
Golden Yellow
B
Crimson Red
C
Blue-Green
✓ Correct
D
Lilac Violet
💡 Step-by-Step Explanation & Concept Rationale
Copper salts produce a characteristic green to blue-green flame due to excitation of electrons in the d-block metal ion.
Q. 17 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In inorganic chemistry analysis #16: What color is produced when copper ions (Cu2+) undergo flame test identification?
A
Lilac Violet
B
Crimson Red
C
Golden Yellow
D
Blue-Green
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Copper salts produce a characteristic green to blue-green flame due to excitation of electrons in the d-block metal ion.
Q. 18 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In inorganic chemistry analysis #21: What color is produced when copper ions (Cu2+) undergo flame test identification?
A
Blue-Green
✓ Correct
B
Crimson Red
C
Golden Yellow
D
Lilac Violet
💡 Step-by-Step Explanation & Concept Rationale
Copper salts produce a characteristic green to blue-green flame due to excitation of electrons in the d-block metal ion.
Q. 19 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In inorganic chemistry analysis #26: What color is produced when copper ions (Cu2+) undergo flame test identification?
A
Crimson Red
B
Blue-Green
✓ Correct
C
Golden Yellow
D
Lilac Violet
💡 Step-by-Step Explanation & Concept Rationale
Copper salts produce a characteristic green to blue-green flame due to excitation of electrons in the d-block metal ion.
Q. 20 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In inorganic chemistry analysis #31: What color is produced when copper ions (Cu2+) undergo flame test identification?
A
Golden Yellow
B
Crimson Red
C
Blue-Green
✓ Correct
D
Lilac Violet
💡 Step-by-Step Explanation & Concept Rationale
Copper salts produce a characteristic green to blue-green flame due to excitation of electrons in the d-block metal ion.
Q. 21 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
In inorganic chemistry analysis #36: What color is produced when copper ions (Cu2+) undergo flame test identification?
A
Lilac Violet
B
Crimson Red
C
Golden Yellow
D
Blue-Green
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Copper salts produce a characteristic green to blue-green flame due to excitation of electrons in the d-block metal ion.
Q. 22 Chemistry (Secondary & College Level)
Difficulty: EASY (1 Mark)
One mole of any ideal gas at standard temperature and pressure (STP: 0 C, 1 atm) occupies a molar volume of:
A
22.414 dm^3 (litres)
✓ Correct
B
24.0 dm^3
C
11.2 dm^3
D
44.8 dm^3
💡 Step-by-Step Explanation & Concept Rationale
According to Avogadro's law, 1 mole of an ideal gas occupies 22.414 L at STP.
Q. 23 Chemistry (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
In stoichiometry and solution chemistry #6: What is the normality of a 1 M sulfuric acid (H2SO4) solution for neutralization reactions?
A
1 N
B
2 N
✓ Correct
C
0.5 N
D
4 N
💡 Step-by-Step Explanation & Concept Rationale
Normality = Molarity * Basicity. Since H2SO4 is diprotic (basicity = 2), Normality = 1 M * 2 = 2 N.
Q. 24 Chemistry (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
In stoichiometry and solution chemistry #11: What is the normality of a 1 M sulfuric acid (H2SO4) solution for neutralization reactions?
A
0.5 N
B
1 N
C
2 N
✓ Correct
D
4 N
💡 Step-by-Step Explanation & Concept Rationale
Normality = Molarity * Basicity. Since H2SO4 is diprotic (basicity = 2), Normality = 1 M * 2 = 2 N.
Q. 25 Chemistry (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
In stoichiometry and solution chemistry #16: What is the normality of a 1 M sulfuric acid (H2SO4) solution for neutralization reactions?
A
4 N
B
1 N
C
0.5 N
D
2 N
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Normality = Molarity * Basicity. Since H2SO4 is diprotic (basicity = 2), Normality = 1 M * 2 = 2 N.
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