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Class 9 Science Chapter 3 Atoms and Molecules Quiz 4
The study of atoms and molecules forms the very core of chemistry, making it crucial for students to grasp these concepts early on. Chapter 3 of Class 9 Science Atoms and Molecules quiz, introduces you to fundamental topics like atomic mass, molecular formulas, and the laws of chemical combination. To strengthen your understanding of these concepts, regular practice through Atoms and Molecules quiz 4.
Our Class 9 Science Atoms and Molecules Quiz 4 series is designed to help you test your knowledge step by step. Quiz 4 in this series is particularly useful for revisiting critical topics covered in Class 9 Chemistry Atoms and Molecules quiz 4, ensuring you’re prepared for both exams and practical applications. By taking this quiz, you’ll not only improve your grasp on key concepts but also develop problem-solving skills through questions that simulate real exam scenarios.
Don’t forget to check out Quiz 1, Quiz 2, and Quiz 3 on Atoms and Molecules from the same chapter for comprehensive practice. These quizzes cover a variety of Atoms and Molecules Test Class 9 topics, ensuring a thorough revision. Whether it’s Class 9 Chapter 3 Quiz Atoms and Molecules or Class 9 Science Atoms Molecules MCQs, consistent practice through these quizzes will greatly enhance your understanding and retention of important chemistry concepts.
Class 9 Science Atoms and Molecules Quiz 4 Rules
- Time Limit: You will have 15 minutes to complete the quiz, so make sure to allocate your time wisely for each question.
- Multiple Choices: Each question presents several answer options. Use your understanding of the topic to choose the most accurate one.
- Single Correct Answer: There is only one correct answer for each question, so select the option that best reflects your knowledge of the chapter.
- No Negative Marking: Don’t worry about losing marks for incorrect answers. If you’re uncertain, feel free to take an educated guess.
Class 9 Science Atoms and Molecules Quiz 4 Structure
- Total Questions: 10
- Topics Covered: This quiz focuses on the core concepts of Chapter 3, Atoms and Molecules, such as understanding the laws of chemical combinations, Dalton’s atomic theory, and the concept of molecules and atomic mass.
- Approach the questions confidently and use this opportunity to reinforce your grasp on the chapter’s content.
Class 9 Chemistry Chapter 3 Atoms and Molecules Quiz Questions
Question 1: Valence is the combining power of an element. It is also called valency
a) True
b) False
Answer:
The correct answer is a) True. Valence is defined as the number of hydrogen atoms or twice the number of oxygen atoms with which one atom of the element combines. It is also known as valency.
Question 2: Chemical bond is the force of repulsion between atoms
a) True
b) False
Answer:
The correct answer is b) False. A chemical bond is actually the force of attraction between atoms, not repulsion.
Question 3: It is possible to see an atom with the naked eye
a) True
b) False
Answer:
The correct answer is b) False. Atoms are too small to be seen with the naked eye as they do not exist independently.
Question 4: If an element has more than one ionic charge, how is that piece of information represented in a chemical name?
a) By number name in brackets
b) By Roman numerals
c) By simply writing the number
d) By Roman numerals in brackets
Answer:
The correct answer is d) By Roman numerals in brackets. In chemical nomenclature, elements with multiple ionic charges are represented by Roman numerals in parentheses, such as copper (II) chloride for CuCl2.
Question 5: What are two substances put together but not chemically combined?
a) Mixtures and Ethane
b) Mixtures and solutions
c) Mixtures and compounds
d) None of the above
Answer:
The correct answer is b) Mixtures and solutions. Mixtures and solutions involve combining substances without chemical bonding. Each component retains its chemical identity.
Question 6: What is the definition of a molecule?
a) The chemical species containing two or more atoms
b) The chemical species containing one atom
c) The chemical species containing no atoms
d) None of the above
Answer:
The correct answer is a) The chemical species containing two or more atoms. A molecule is defined as a chemical entity consisting of two or more atoms bonded together.
Question 7: What is a group of atoms that are held together by chemical bonds called?
a) Compounds
b) Molecules
c) Neutrons
d) Electrons
Answer:
The correct answer is b) Molecules. Molecules are groups of atoms bonded together chemically. Compounds are substances made of two or more different types of atoms bonded together.
Question 8: A molecule of hemoglobin carries how many oxygen molecules?
a) 1
b) 3
c) 2
d) 4
Answer:
The correct answer is d) 4. Each hemoglobin molecule can carry four oxygen molecules, as it contains four iron atoms, each capable of binding one oxygen molecule.
Question 9: Which of the following statements does not explain the difference between valency and oxidation number?
a) Valency of an element is a fixed quantity whereas oxidation number varies from compound to compound
b) Valency is a pure number whereas oxidation number has positive or negative value
c) Oxidation number and valency have fixed values
d) Valency and oxidation number can be represented for an element or a radical
Answer:
The correct answer is c) Oxidation number and valency have fixed values. Oxidation numbers can vary depending on the compound, whereas valency is generally a fixed property of an element.
Question 10: What is an acid?
a) Proton donor
b) Proton acceptor
c) Both options
d) Donate electrons to form ionic bonds
Answer:
The correct answer is a) Proton donor. Acids are defined as substances that donate protons (H+ ions) when dissolved in water. They may also accept a pair of electrons to form a coordinate covalent bond.
