NCERT Class 9 Science MCQ Chapter 9 Atomic Foundations of Matter English Medium As Per New Syllabus. NCERT Class 9 Science MCQ Chapter 9 Atomic Foundations of Matter Notes to each chapter is provided in the list so that you can easily browse throughout different chapter NCERT Class 9 Science MCQ Chapter 9 Atomic Foundations of Matter Question Answer Download PDF and select needs one. CBSE Class 9 Science Multiple Choice Solutions.
NCERT Class 9 Science MCQ Chapter 9 Atomic Foundations of Matter
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Atomic Foundations of Matter
Chapter – 9
| MCQ |
Tick the Correct Options:
1. Who proposed the Law of Conservation of Mass in 1789?
(a) Joseph Proust.
(b) John Dalton.
(c) Antoine Lavoisier.
(d) Ernest Rutherford.
Ans: (c) Antoine Lavoisier.
2. Which law states that in a chemical reaction, matter can neither be created nor destroyed?
(a) Law of Definite Proportions.
(b) Law of Conservation of Mass.
(c) Law of Constant Proportions.
(d) Proust’s Law.
Ans: (b) Law of Conservation of Mass.
3. What is the fixed mass ratio of hydrogen to oxygen in purified water, regardless of its source?
(a) 1:2.
(b) 2:1.
(c) 8:1.
(d) 1:8.
Ans: (d) 1:8.
4. Which scientist proposed the Law of Constant Proportions?
(a) Joseph Proust.
(b) Antoine Lavoisier.
(c) John Dalton.
(d) Raja Ramanna.
Ans: (a) Joseph Proust.
5. According to Dalton’s Atomic Theory, what happens to atoms during a chemical reaction?
(a) They are destroyed and converted into energy.
(b) They combine randomly without any fixed ratio.
(c) They are indivisible particles that merely rearrange.
(d) They change into atoms of different elements.
Ans: (c) They are indivisible particles that merely rearrange.
6. What is the definition of a molecule?
(a) A charged particle that cannot exist independently.
(b) The smallest indivisible particle of matter.
(c) A combination of atoms that always have the same mass.
(d) An electrically neutral entity consisting of more than one atom capable of independent existence.
Ans: (d) An electrically neutral entity consisting of more than one atom capable of independent existence.
7. When atoms combine by sharing a few or all of their valence electrons with another atom, what kind of bond is formed?
(a) Ionic bond.
(b) Covalent bond.
(c) Metallic bond.
(d) Hydrogen bond.
Ans: (b) Covalent bond.
8. How many electrons are shared between two atoms in a single covalent bond?
(a) One electron each (a shared pair).
(b) Two electrons each.
(c) Three electrons each.
(d) None are shared.
Ans: (a) One electron each (a shared pair).
9. In an oxygen molecule (O₂), the two oxygen atoms are held together by a:
(a) Single covalent bond.
(b) Double covalent bond.
(c) Triple covalent bond.
(d) Ionic bond.
Ans: (b) Double covalent bond.
10. When naming a covalent compound, which prefix indicates the presence of six atoms of an element?
(a) Tetra-.
(b) Penta-.
(c) Hexa-.
(d) Hepta-.
Ans: (c) Hexa-.
11. What is the correct chemical name for N₂O₅?
(a) Nitrogen oxide.
(b) Dinitrogen pentoxide.
(c) Dinitrogen tetroxide.
(d) Mononitrogen pentoxide.
Ans: (b) Dinitrogen pentoxide.
12. What is the common name for the compound nitrogen trihydride (NH₃)?
(a) Water.
(b) Methane.
(c) Ammonium.
(d) Ammonia.
Ans: (d) Ammonia.
13. A bond formed by the transfer of valence electrons from one atom to another is called an:
(a) Ionic bond.
(b) Covalent bond.
(c) Atomic bond.
(d) Neutral bond.
Ans: (a) Ionic bond.
14. When a sodium atom loses its one valence electron, it becomes a:
(a) Neutral sodium molecule.
(b) Positively charged sodium cation.
(c) Negatively charged sodium anion.
(d) Sodium isotope.
Ans: (b) Positively charged sodium cation.
15. What type of force holds oppositely charged ions together in an ionic compound?
(a) Gravitational force.
(b) Magnetic force.
(c) Electrostatic force of attraction.
(d) Friction.
Ans: (c) Electrostatic force of attraction.
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