SEBA Class 9 Science Chapter 3 Atoms and Molecules MCQs (2026–27) – Assam Eduverse
The SEBA Class 9 Science Chapter 3 Atoms and Molecules MCQs (2026–27) are designed as per the latest ASSEB syllabus and updated board exam pattern. These SEBA Class 9 Science Chapter 3 Atoms and Molecules MCQs include important objective questions, numerical-based MCQs, and concept-focused practice sets to help students prepare effectively for exams.
Prepared by subject experts of Assam Eduverse, these SEBA Class 9 Science Chapter 3 MCQs cover key topics such as laws of chemical combination, Dalton’s atomic theory, atomic and molecular mass, mole concept, valency, and chemical formulae. Practicing these Atoms and Molecules MCQs Class 9 SEBA and Assam Board Class 9 Science objective questions improves conceptual clarity and problem-solving accuracy. For more practice, explore Class 9 Science chapterwise MCQs and SEBA Class 9 MCQs.
Regular revision of these ASSEB Class 9 Science Important MCQs ensures strong preparation and better performance in exams. You can also check the detailed solutions here: SEBA Class 9 Science Chapter 3 Atoms and Molecules Solutions, or explore complete resources from SEBA Class 9 & 10 study materials and SEBA Class 9 syllabus.
SEBA Class 9 Science Chapter 3 Atoms and Molecules MCQs – ASSEB 2026–27 Board Exam Practice
Table of Contents
Before You Start
Test your knowledge with the SEBA Class 9 Science MCQs Quiz. Read each question carefully and select the correct answer. Your answer is checked instantly after you choose an option, and a detailed explanation appears immediately to help you learn every concept and improve your exam preparation.
Which scientist proposed the definitive atomic theory stating that all matter is composed of indivisible, ultimate particles called atoms?
✅ Correct Answer
Concept Explanation
In 1808, British chemist John Dalton formulated his historic Atomic Theory, which postulated that all matter—whether an element, compound, or mixture—is composed of tiny, indivisible components called atoms that act as the fundamental units of chemical reactions.
The law which dictates that mass can neither be created nor destroyed over the course of a chemical reaction is defined as the:
✅ Correct Answer
Concept Explanation
The Law of Conservation of Mass states that during any chemical transformation, the total mass of the products generated remains exactly equal to the total mass of the initial reactants. This means that atoms are simply rearranged, not created or destroyed.
The Law of Constant (or Definite) Proportions, which describes compound composition, was originally stated by:
✅ Correct Answer
Concept Explanation
French chemist Joseph Proust formulated the Law of Constant Proportions, demonstrating that in a pure chemical substance, the constituent elements are always combined in a rigid, fixed ratio by mass, regardless of the sample's origin or method of preparation.
Inside a molecule of pure water (H2O), the fixed ratio of the mass of hydrogen to the mass of oxygen is always:
✅ Correct Answer
Concept Explanation
A single water molecule holds 2 Hydrogen atoms (atomic mass = 1 u each) and 1 Oxygen atom (atomic mass = 16 u). Calculating their mass ratio yields:
Mass of Hydrogen : Mass of Oxygen = (2 × 1) : 16 = 2 : 16 = 1 : 8. Therefore, 9 grams of water will always yield 1 gram of hydrogen and 8 grams of oxygen.
According to classic chemical postulates, atoms belonging to different chemical elements inherently differ from each other in their:
✅ Correct Answer
Concept Explanation
One of Dalton's core atomic assumptions specifies that atoms of different elements have completely distinct identities. Consequently, they possess unique atomic masses and distinct chemical reactivities that set them apart from other elements.
Due to the microscopic scale of atomic sizes, an atomic radius is measured standardly in terms of:
✅ Correct Answer
Concept Explanation
Atoms are inconceivably minute structures. To quantify their size effectively without using awkward scientific exponents, scientists use the sub-metric unit called the nanometre (nm) as the global standard for atomic and ionic radii.
What is the exact scientific relationship between a single nanometre unit and a standard metre?
✅ Correct Answer
Concept Explanation
A nanometre represents one-billionth part of a standard linear metre. Written using standard exponential notation, this fraction corresponds exactly to 10⁻⁹ m (or 1 m = 10⁹ nm).
Which of the following elemental gases exists stablely as a monoatomic molecule?
✅ Correct Answer
Concept Explanation
Noble gases like Argon (Ar) and Helium possess chemically stable, fully filled outer electron shells. Because they are inert, they do not bond with other atoms and exist naturally as single, isolated atoms, which means their atomicity is 1 (monoatomic). Oxygen (O₂), Nitrogen (N₂), and Chlorine (Cl₂) exist as diatomic molecules.
The total number of constituent atoms present within a single molecule of elemental oxygen gas (O2) is:
✅ Correct Answer
Concept Explanation
Atomicity represents the count of atoms that cluster together to make a stable molecule. Because elemental oxygen gas naturally structures itself as a diatomic unit consisting of 2 bonded oxygen atoms, its molecular formula is written as O₂.
What is the baseline atomicity exhibited by a stable molecule of elemental white phosphorus?
✅ Correct Answer
Concept Explanation
Elemental phosphorus naturally bonds together as clusters of 4 individual atoms to form a stable molecule. Its molecular structure is written as P₄, making it a tetraatomic molecule.
Which of the following alternatives represents a polyatomic ion carrying a net cluster charge?
✅ Correct Answer
Concept Explanation
A polyatomic ion is a covalently bonded cluster of two or more atoms that carries a net positive or negative electrical charge. The hydroxide ion (OH⁻) is a polyatomic ion composed of one oxygen atom bonded to one hydrogen atom, holding a net -1 charge. Ions like Na⁺, Cl⁻, and H⁺ are monoatomic because they consist of only a single charged atom.
The combining capacity or valency value exhibited standardly by an Oxygen atom is:
✅ Correct Answer
Concept Explanation
Oxygen holds an atomic number of 8, meaning its electron distribution is arranged as (2, 6). To fill its outer valence shell and satisfy the octet rule, an oxygen atom must share or gain 2 additional electrons, giving it a stable valency value of 2.
Applying valence cross-over rules, what is the correct chemical formula for calcium oxide?
✅ Correct Answer
Concept Explanation
Both Calcium (Ca²⁺) and Oxygen (O²⁻) hold equal valencies of 2. When writing the formula, crossing over their valencies initially yields Ca₂O₂. Simplifying this down to the lowest whole-number ratio gives the standard formula: CaO.
Applying valence cross-over rules, what is the correct chemical formula for aluminium oxide?
✅ Correct Answer
Concept Explanation
Aluminium holds a valency of 3, while Oxygen holds a valency of 2. Crossing over these valency values to balance the net electrical charge yields the chemical compound formula: Al2O3.
The absolute calculated molecular mass of a single water molecule (H2O) is:
✅ Correct Answer
Concept Explanation
To find the molecular mass of water, sum the individual atomic masses of its constituent atoms:
Molecular mass of H₂O = (2 × Atomic Mass of Hydrogen) + (1 × Atomic Mass of Oxygen)
= (2 × 1 u) + (1 × 16 u) = 2 u + 16 u = 18 u.
Given that Na = 23 u and Cl = 35.5 u, the standard formula unit mass of sodium chloride (NaCl) is calculated as:
✅ Correct Answer
Concept Explanation
For ionic chemical compounds like sodium chloride that do not contain distinct, separate molecules, we calculate the formula unit mass by summing the atomic masses of the constituent ions in the formula unit:
Formula unit mass of NaCl = 23 u + 35.5 u = 58.5 u.
Exactly one mole of any chemical substance contains how many representative particles?
✅ Correct Answer
Concept Explanation
One mole is an absolute counting constant equal to exactly 6.022 × 10²³ items. This value is known globally as the Avogadro Constant ($N_A$) and acts as the link between the microscopic world of atoms and the macroscopic world of laboratory measurements.
The official International System of Units (SI) base unit used to express the amount of a substance is the:
✅ Correct Answer
Concept Explanation
The mole (symbol: mol) is the official SI base unit used to measure the amount of a substance. It scales up counting atomic-level components by defining a specific number of elementary entities (atoms, molecules, or ions).
The molar mass of a hydrogen atom (H), expressed in macroscopic units, is:
✅ Correct Answer
Concept Explanation
While the relative atomic mass of a single hydrogen atom is 1 u (atomic mass units), its molar mass represents the mass of one entire mole ($6.022 \times 10^{23}$ atoms) of hydrogen. This value shares the same numerical baseline but is expressed in grams, giving a value of **1 g/mol**.
Given the radical groups NH4+ and SO42-, what is the correct chemical formula for ammonium sulphate?
✅ Correct Answer
Concept Explanation
The polyatomic ammonium ion holds a valency of 1 (NH₄⁺), while the sulphate radical holds a valency of 2 (SO₄²⁻). Crossing over these valency values requires 2 ammonium units to balance 1 sulphate unit. We enclose polyatomic ions in parentheses before adding subscripts, giving the formula: (NH4)2SO4.
Assertion (A): The total macroscopic mass remains constant throughout a closed chemical reaction.
Reason (R): Atoms are neither created nor destroyed during any standard chemical reaction.
✅ Correct Answer
Concept Explanation
Dalton's atomic theory provides the foundation for the Law of Conservation of Mass by explaining that a chemical reaction is simply a rearrangement of atoms. Because atoms are indivisible units that cannot be created or destroyed, the total mass of the products must equal the total mass of the initial reactants.
Assertion (A): Pure water samples collected from any source always contain hydrogen and oxygen elements in a fixed mass ratio of 1:8.
Reason (R): The constituent elements within a chemical compound are always present in definite proportions by mass.
✅ Correct Answer
Concept Explanation
The statement that water always holds an unchanging 1:8 mass ratio of Hydrogen to Oxygen is a direct consequence of the Law of Definite Proportions. Because any sample of a pure chemical compound is bound by this law, its components will always reflect a fixed, characteristic mass ratio.
Assertion (A): Atoms belonging to the same chemical element exhibit identical chemical reactivities and properties.
Reason (R): Atoms belonging to the same chemical element share an identical atomic mass value.
✅ Correct Answer
Concept Explanation
Both statements are true according to Dalton's original postulates (though modern chemistry notes that isotopes can have different masses). However, the reason statement does not explain why they share identical chemical properties. Their identical chemical behavior is determined by their matching atomic numbers and valence electron configurations, not their atomic mass.
Assertion (A): Elemental Argon gas exists stably as a monoatomic molecular structure.
Reason (R): A single molecule of Argon contains only one individual, unbonded atom.
✅ Correct Answer
Concept Explanation
Argon is a noble gas with a stable, fully filled outer electron shell ($3s^2 3p^6$). Because it does not need to gain, lose, or share electrons to maintain stability, it exists as independent, unbonded atoms, meaning its molecules are monoatomic (composed of exactly one atom).
Assertion (A): One mole of diatomic oxygen molecules contains exactly 6.022 × 10²³ individual molecules.
Reason (R): The mole represents the standard SI base unit used to measure mass.
✅ Correct Answer
Concept Explanation
The assertion is true because by definition, one mole of any entity always contains the Avogadro number ($6.022 \times 10^{23}$) of those units. The reason statement is false because the mole is the SI base unit for the amount of a substance, whereas the kilogram (kg) is the standard SI unit used to measure mass.
Assertion (A): The atomic mass unit is internationally defined using the Carbon-12 isotope standard.
Reason (R): One atomic mass unit is defined as exactly equal to one-twelfth the absolute mass of a single atom of Carbon-12.
✅ Correct Answer
Concept Explanation
To create a stable reference for atomic weights, scientists chose the Carbon-12 isotope as the global standard. One unified atomic mass unit (u) is set exactly as 1/12th the mass of a single Carbon-12 atom, making the relative atomic mass of Carbon-12 exactly 12 u. Therefore, the reason directly explains the foundation of the assertion.
Assertion (A): Pure metals and certain elemental forms like carbon do not consist of simple, discrete molecular structures.
Reason (R): These materials exist as continuous networks containing an indefinitely large number of atoms bonded together.
✅ Correct Answer
Concept Explanation
Unlike molecular gases that form distinct, small clusters (like O₂ or H₂O), metals and network solids like carbon (diamond or graphite) form giant macroscopic structures. They consist of an endless lattice of atoms bound together by metallic or covalent bonds, meaning they are represented by empirical formulas rather than distinct molecular formulas.
Assertion (A): The correct chemical formula for calcium hydroxide is written as Ca(OH)2.
Reason (R): Parentheses are required in a chemical formula whenever more than one polyatomic ion is needed to balance the electrical charge.
✅ Correct Answer
Concept Explanation
Calcium forms a divalent cation (Ca²⁺) while hydroxide is a monovalent polyatomic anion (OH⁻). To create a neutral compound, two hydroxide units are required. When multiple polyatomic ions are present, they must be enclosed in parentheses before adding the subscript coefficient, ensuring the multiplier applies to the entire radical group.
Assertion (A): The molecular mass of a chemical compound is computed as the sum of the individual atomic masses of all constituent atoms in its formula.
Reason (R): The relative molecular mass value of any substance is expressed in unified atomic mass units (u).
✅ Correct Answer
Concept Explanation
Both statements are factually correct: molecular mass is calculated by summing the masses of all atoms present in a molecule, and its standard unit is the unified atomic mass unit (u). However, the reason statement does not provide the logical explanation for how the mass is calculated; it merely defines the unit used to measure it.
Assertion (A): In any neutral ionic compound, the total positive and negative charges on the constituent ions must balance each other out exactly.
Reason (R): The macroscopic crystalline structure of an ionic compound must always maintain net electrical neutrality.
✅ Correct Answer
Concept Explanation
Ionic compounds consist of positively charged cations and negatively charged anions held together by strong electrostatic attractions. Because stable matter does not carry a net charge, the absolute number of positive charges must equal the total number of negative charges, making the complete formula unit electrically neutral.
Which of the following statements match the classic core postulates of Dalton's Atomic Theory? - (i) Chemical atoms are indivisible particles that cannot be split
- (ii) Atoms can be generated out of nothing during a chemical reaction
- (iii) Atoms join together in simple whole-number ratios to form compounds
✅ Correct Answer
Concept Explanation
Dalton's historic theory stated that atoms are indivisible structural units and that they combine in simple whole-number ratios to generate compounds. Postulate (ii) is false because Dalton established that atoms can neither be created nor destroyed within any chemical process, matching the law of conservation of mass.
Which of the following options contain gaseous entries that exist natively as diatomic molecular structures? - (i) Oxygen gas (O2)
- (ii) Nitrogen gas (N2)
- (iii) Argon gas (Ar)
✅ Correct Answer
Concept Explanation
Diatomic molecules consist of exactly two atoms bonded together. Oxygen (O₂) and Nitrogen (N₂) both exist naturally as diatomic molecules to complete their valence electron structures. Argon (Ar) is an inert noble gas with a stable octet configuration, meaning it exists strictly as an isolated monoatomic element.
Which of the following chemical species are classified as polyatomic ions? - (i) Sulphate ion (SO42-)
- (ii) Ammonium ion (NH4+)
- (iii) Chloride ion (Cl-)
✅ Correct Answer
Concept Explanation
Polyatomic ions are clusters of covalently bonded atoms that act as a single unit carrying a net residual charge. The sulphate ion (1 sulphur, 4 oxygen atoms) and the ammonium ion (1 nitrogen, 4 hydrogen atoms) both fit this classification. The chloride ion (Cl⁻) consists of a single charged atom, making it a monoatomic ion.
Which of the following systems strictly follows the Law of Definite (or Constant) Proportions? - (i) Heterogeneous mixtures
- (ii) Pure chemical compounds
- (iii) Homogeneous solutions
- (iv) Solid metal alloys
✅ Correct Answer
Concept Explanation
The Law of Definite Proportions applies exclusively to pure chemical compounds, stating that their constituent elements are chemically bound in a single, unchanging ratio by mass. Mixtures, solutions, and metallic alloys are physical combinations that can be blended together in highly variable ratios.
Which of the following values correctly represents the numerical baseline of the Avogadro constant?
✅ Correct Answer
Concept Explanation
The Avogadro number ($N_A$) is a defined physical constant that sets the exact number of entities contained within one mole of any substance. Its globally accepted value is fixed at 6.022 × 10²³.
Which of the following entries represents a true binary compound composed of exactly two different elements? - (i) Sodium chloride (NaCl)
- (ii) Ammonium chloride (NH4Cl)
- (iii) Sodium sulphate (Na2SO4)
- (iv) Calcium hydroxide (Ca(OH)2)
✅ Correct Answer
Concept Explanation
A binary compound is a chemical compound composed of exactly two different chemical elements. Sodium chloride (NaCl) fits this definition perfectly because it contains only Sodium (Na) and Chlorine (Cl). The remaining options contain polyatomic ionic groups that introduce three or more distinct elements (such as N, H, Cl or Na, S, O), which classifies them as ternary or complex compounds.
Which of the following chemical formulae are written correctly according to valence balancing rules? - (i) Magnesium chloride: MgCl2
- (ii) Sodium carbonate: Na2CO3
- (iii) Calcium chloride: CaCl
✅ Correct Answer
Concept Explanation
Formula (i) is correct because Mg²⁺ requires two Cl⁻ ions. Formula (ii) is correct because the carbonate radical (CO₃²⁻) requires two Na⁺ ions to neutralize its charge. Entry (iii) is incorrect because Calcium forms a divalent cation (Ca²⁺) that must bind with two monovalent chloride ions, making its correct formula **CaCl₂**.
Given that the atomic weight of Oxygen is 16 u, the molar mass of an oxygen molecule (O2) is:
✅ Correct Answer
Concept Explanation
An oxygen gas molecule exists as a diatomic cluster (O₂). Its relative molecular mass is calculated as 2 × 16 u = 32 u. Scaling this property up to represent one full mole of these molecules gives an equivalent mass value expressed in grams, which matches exactly 32 grams per mole.
The absolute chemical mass exhibited by exactly one mole of elemental carbon atoms is:
✅ Correct Answer
Concept Explanation
The relative atomic mass of Carbon is 12 u. The mass of one mole of any elemental substance (its molar mass) shares the exact same numerical baseline value but is measured standardly in grams, giving a final value of 12 grams.
Which of the following elements naturally structures its molecule as a tetra-atomic cluster?
✅ Correct Answer
Concept Explanation
Tetra-atomic molecules are made up of exactly four atoms bonded together. Elemental white phosphorus exists as discrete P₄ tetrahedral molecules, giving it an atomicity value of 4. Nitrogen (N₂), Oxygen (O₂), and Chlorine (Cl₂) are all diatomic.
Match the chemical law or unit in Column A with its defining description in Column B:
| Column A | Column B |
|---|---|
| (1) Law of conservation of mass | (a) Equal to 6.022 × 10²³ representative particles |
| (2) Law of definite proportions | (b) Defined as 1/12th the mass of a single carbon-12 atom |
| (3) Atomic mass unit (u) | (c) Total system mass remains constant throughout a reaction |
| (4) Chemical Mole unit | (d) Elements combine in a fixed, constant proportion by mass |
✅ Correct Answer
Concept Explanation
The law of conservation of mass establishes that mass is conserved across reactions. The law of definite proportions states that compounds have fixed element weight ratios. One unified atomic mass unit is equal to 1/12th the mass of a carbon-12 atom, and one mole contains the Avogadro number of particles.
Match the molecular chemical formula in Column A with its systematic name in Column B:
| Column A | Column B |
|---|---|
| (1) H2O | (a) Trioxygen or Ozone gas |
| (2) NH3 | (b) Ammonia gas |
| (3) CO2 | (c) Water vapor or liquid |
| (4) O3 | (d) Carbon dioxide gas |
✅ Correct Answer
Concept Explanation
H₂O represents the formula for water. NH₃ represents the formula for ammonia gas. CO₂ represents carbon dioxide, and O₃ is the formula for ozone gas (a triatomic molecule of oxygen).
Match the ionic chemical species in Column A with its description category in Column B:
| Column A | Column B |
|---|---|
| (1) Na+ | (a) Generic term for any cation species |
| (2) Cl- | (b) Generic term for any anion species |
| (3) SO42- | (c) Charged cluster forming a polyatomic ion |
| (d) NH4+ | (4) Specifically a simple, monoatomic positively charged ion |
✅ Correct Answer
Concept Explanation
Na⁺ is a monoatomic positively charged ion (a cation). Cl⁻ is a negatively charged ion (an anion). SO₄²⁻ is a polyatomic anion containing multiple atoms acting as a single unit, and NH₄⁺ is a polyatomic cation.
Match the chemical elements in Column A with their relative atomic masses in Column B:
| Column A | Column B |
|---|---|
| (1) Hydrogen element | (a) 12 u |
| (2) Oxygen element | (b) 1 u |
| (3) Nitrogen element | (c) 16 u |
| (4) Carbon element | (d) 14 u |
✅ Correct Answer
Concept Explanation
The standard relative atomic mass values measured using the Carbon-12 scale are: Hydrogen = 1 u, Carbon = 12 u, Nitrogen = 14 u, and Oxygen = 16 u.
An unknown liquid mixture is passed through a standard laboratory filter paper, and no residue is left behind. When a laser beam is shone through the liquid in a dark room, the path of the light beam becomes clearly visible. Finally, when the liquid is heated strongly, it separates into a solid powder and a gas without generating any new chemical bonds. How should this liquid mixture be classified?
✅ Correct Answer
Concept Explanation
This question connects three major concepts from the chapter:
1. Colloidal Nature: Because the mixture passes completely through filter paper without leaving a residue, its particles must be smaller than those of a suspension. However, because it scatters the laser beam (demonstrating the Tyndall effect), its particles are large enough to reflect light, which rules out a true solution. This unique combination matches a stable colloid.
2. Physical vs. Chemical Change: When the mixture is heated, it breaks down into its individual parts without breaking or generating new chemical bonds. Because the core chemical identities of the substances were preserved, this separation is strictly a physical change (evaporation/drying) rather than a chemical decomposition.
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SEBA Class 9 Science Chapter 3 Atoms and Molecules MCQs – Important Objective Questions
Building a strong foundation in Atoms and Molecules is crucial for understanding advanced concepts in Chemistry. Practicing well-structured MCQs based on the latest SEBA (ASSEB) syllabus helps students strengthen their basics and become familiar with the types of objective questions asked in examinations.
These SEBA Class 9 Science Chapter 3 MCQs are designed to cover important topics such as the laws of chemical combination, Dalton’s atomic theory, atomic and molecular masses, valency, chemical formula writing, and the mole concept. Since this chapter includes both theory and numerical-based questions, regular practice is essential for developing accuracy and confidence.
Solving these important MCQs for Class 9 Science allows students to improve their problem-solving skills, especially in numerical calculations related to moles and mass relationships. It also helps in avoiding common errors while balancing equations, writing correct chemical formulae, and understanding fundamental principles.
Consistent revision through objective questions enhances speed, precision, and conceptual clarity. Students become more comfortable with exam patterns, manage time effectively, and can quickly revise key concepts before tests or final exams.
For better performance in school assessments and board-level examinations, students should make these MCQs a regular part of their study routine. With clear concepts and continuous practice, scoring well in this chapter becomes much more achievable and less stressful.
FAQs – SEBA Class 9 Science Chapter 3 Atoms and Molecules MCQs
1. How many MCQs come from Atoms and Molecules in SEBA Class 9 exam?
Around 45 MCQs come from the Science paper overall. Expect 3–5 questions from this chapter, so practice basics like mole concept carefully.
2. Which are the most important MCQs from Class 9 Science Chapter 3 SEBA?
Focus on laws of chemical combination, mole calculations, and atomic mass. These are repeated topics, so revise formulas and definitions properly.
3. Are numericals asked in Atoms and Molecules MCQs SEBA Class 9?
Yes, simple numericals based on mole and mass are common. Practice conversions like grams to moles to avoid confusion in MCQ options.
4. Where can I download SEBA Class 9 Science Chapter 3 MCQs with answers?
You can find chapter-wise MCQs with solutions on Assam Eduverse. Always choose updated PDFs based on latest ASSEB exam pattern.
5. Is Atoms and Molecules a difficult chapter for SEBA students?
It feels tough initially, but becomes easy with formula practice. Focus on concepts like Avogadro number and mole to build confidence.
6. How to score full marks in Atoms and Molecules MCQs SEBA Class 9?
Practice daily MCQs and revise formulas regularly. Assam Eduverse mock tests can help improve speed and accuracy before exams.
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