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Class 9 Science Chapter 4 Structure Of The Atom Quiz 2
Welcome to Quiz 2 of Class 9 Science Chapter 4 Structure of the Atom. In this quiz, you will find a fresh set of multiple choice questions related to the important concepts covered in the atom structure chapter. Just like Quiz 1, this set of questions will test your understanding of key topics such as atomic structure, electron configuration, and the different models of the atom. These Chapter 4 quiz questions are designed to help you revise and prepare for your upcoming exams. Stay tuned as we release more quizzes, going up to Quiz 5, to make sure you’re fully prepared for the CBSE Class 9 Science atomic structure test.
Class 9 Chemistry Structure of the Atom Quiz 2 Rules
- Quiz 2 will test students on important concepts related to atomic structure, building on the foundation established in Quiz 1.
- It includes multiple-choice questions to assess knowledge of atomic models, electron configuration, and the structure of atoms.
- Answer all questions thoughtfully to strengthen your grasp on the chapter’s more advanced ideas.
- Use this quiz as a tool for revision before exams, and to pinpoint topics that need additional study.
Class 9 Chemistry Structure of the Atom Quiz 2 Structure
- The quiz focuses on key topics from Chapter 4 of Class 9 Chemistry.
- The structure includes multiple-choice questions evaluating understanding of:
- Atomic structure and subatomic particles
- Different atomic models (e.g., Bohr, Rutherford)
- Electron configuration and arrangement
- The aim is to help students revise and prepare thoroughly for upcoming assessments.
- Additional quizzes will follow, from Quiz 3 to Quiz 5, to ensure complete understanding of the chapter.
Class 9 Chemistry Chapter 4 Structure Of The Atom Quiz Questions
Question 1: Dalton’s proposed atomic theory is based on several postulates. Which postulate of this theory reflects the law of conservation of mass?
a) Atoms can neither be created nor destroyed
b) Each element is composed of extremely small particles called atoms
c) All the atoms of a given element are identical
d) During chemical combination, atoms of different elements combine in simple ratios
Answer:
The correct answer is a) Atoms can neither be created nor destroyed.
This postulate reflects the law of conservation of mass as it states that the number of atoms remains unchanged during a chemical reaction. For example, in the reaction:
C + O2 → CO2
The number of atoms on the reactant side is the same as on the product side.
Question 2: Dalton assumed that _____ are the smallest particles of a compound.
a) Atoms
b) Molecules
c) Ions
d) Elements
Answer:
The correct answer is a) Atoms.
According to Dalton’s atomic theory, atoms are the smallest particles that make up compounds.
Question 3: The concept that atoms combine in small whole number ratios was proposed by ____?
a) Dalton
b) Avogadro
c) Gay Lussac
d) Berzelius
Answer:
The correct answer is a) Dalton.
This concept is one of the postulates of Dalton’s atomic theory.
Question 4: According to Dalton’s atomic theory, atoms of different elements are ____?
a) Similar
b) Different
c) Identical
d) Almost identical
Answer:
The correct answer is b) Different.
Dalton’s atomic theory states that atoms of different elements vary in size, mass, and other properties.
Question 5: Dalton’s atomic theory could not explain the law of ____?
a) Conservation of mass
b) Multiple proportions
c) Constant proportions
d) Gaseous volumes
Answer:
The correct answer is d) Gaseous volumes.
Dalton’s theory explained several laws of chemical combination but failed to explain the law of gaseous volumes, which requires ideal gas laws for explanation.
Question 6: The atomic theory of matter was proposed by ____?
a) John Kennedy
b) Lavoisier
c) Proust
d) John Dalton
Answer:
The correct answer is d) John Dalton.
John Dalton is credited with proposing the atomic theory of matter.
Question 7: The first scientist to study the atom was ____?
a) Dalton
b) Democritus
c) Maharshi Kanada
d) Both b) and c)
Answer:
The correct answer is a) Dalton.
Dalton was the first scientist to formally study atoms based on his atomic theory.
Question 8: According to Maharshi Kanada, what is the smallest particle of matter?
a) Paramanu
b) Atom
c) Molecule
d) Pedantic
Answer:
The correct answer is a) Paramanu.
Maharshi Kanada referred to the atom as Paramanu and the molecule as Anu.
Question 9: Which postulate of Dalton’s theory reflects the law of conservation of mass?
a) Matter can neither be created nor destroyed
b) Atoms of different elements differ in properties
c) Atoms of similar elements are identical in properties
d) The atom is the smallest particle that takes part in chemical reactions
Answer:
The correct answer is a) Matter can neither be created nor destroyed.
This postulate aligns with the law of conservation of mass, which states that atoms cannot be created or destroyed in a chemical reaction.
Question 10: Which of the following is NOT a postulate of Dalton’s atomic theory?
a) Each element is made up of extremely small particles called atoms
b) Atoms of a given element are identical in chemical properties but may have different physical properties
c) Atoms cannot be created or destroyed
d) Compounds are formed by the chemical union of atoms of two or more elements in fixed proportions which are simple whole numbers
Answer:
The correct answer is b) Atoms of a given element are identical in chemical properties but may have different physical properties.
Dalton’s theory stated that atoms of a given element are identical in all properties, both chemical and physical.
