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Class 9 Science Chapter 3 Atoms and Molecules Quiz 5
Welcome to the final quiz 5 of Class 9 Science Chapter 3 Atoms and Molecules. This quiz 5 on Atoms and Molecules is crafted to help you thoroughly understand key concepts such as the structure of atoms, how molecules are formed, and the significance of valency and chemical formulas. These fundamental ideas are crucial for building a solid base in chemistry, making this quiz an essential tool for reinforcing what you’ve learned in the chapter.
By taking Class 9 Chemistry chapter 3 Atoms and Molecules quiz , you can evaluate how well you comprehend the composition of matter at the atomic and molecular levels. It will help you identify areas where you might need more practice and offer an opportunity to strengthen those concepts. Regularly engaging with quizzes like this boosts your ability to retain information and prepares you to tackle more advanced topics in the future.
Use this Class 9 Science chapter 3 Atoms and Molecules quiz to gauge your progress and refine your understanding. Not only will it highlight areas that need improvement, but it will also build your confidence as you master the material. This quiz is a great way to enhance your exam preparation, ensuring you’re well-prepared to excel in your understanding of atoms, molecules, and the chemical principles that govern their interactions.
Class 9 Atoms and Molecules Quiz 5 Rules
- Time Limit: You have 15 minutes to complete this quiz, so manage your time wisely.
- Multiple Choices: Each question provides several options. Pick the one that is the most accurate based on your understanding.
- Single Correct Answer: Every question has only one correct answer. Choose the best option to reflect your knowledge of the chapter.
- No Negative Marking: There’s no penalty for wrong answers, so if you’re unsure, make your best guess!
Class 9 Atoms and Molecules Quiz 5 Structure
- Total Questions: 10
- Topics Covered: This quiz focuses on core concepts from Chapter 3, “Atoms and Molecules.” It includes topics such as Dalton’s Atomic Theory, laws of chemical combination, the mole concept, and the calculation of molecular masses.
Good luck! Answer confidently and reinforce your understanding of these key concepts.
Class 9 Chemistry Chapter 3 Atoms and Molecules Quiz Questions
Question 1: What is valency?
a) The combining capacity of an element
b) The atomicity of an element
c) The oxidation number of an element
d) All of the above
Answer:
The correct answer is a) The combining capacity of an element.
Valency is the number of electrons an atom can lose, gain, or share during a chemical reaction.
Question 2: What is the symbol of Tungsten?
a) T
b) V
c) W
d) N
Answer:
The correct answer is c) W.
The chemical symbol for Tungsten is “W” due to its historical name, “Wolfram.”
Question 3: What is the strongest chemical bond?
a) Ionic bond
b) Covalent bond
c) Metallic bond
d) Atomic bond
Answer:
The correct answer is b) Covalent bond.
Covalent bonds are the strongest because they involve sharing of electron pairs between atoms.
Question 4: What is the chemical symbol for barium?
a) B
b) Ba
c) Be
d) Bi
Answer:
The correct answer is b) Ba. The chemical symbol for barium is “Ba.”
Question 5: Molecular mass is defined as:
a) The mass of one atom compared with the mass of one molecule
b) The mass of one atom compared with the mass of one atom of hydrogen
c) The mass of one molecule compared with the mass of one atom of C-12
d) None of the above
Answer:
The correct answer is c) The mass of one molecule compared with the mass of one atom of C-12.
Molecular mass is the sum of atomic masses of atoms in a molecule, compared to C-12.
Question 6: Calculate the number of protons, neutrons, and electrons in Br3580.
a) 35, 55, 35
b) 45, 35, 35
c) 35, 45, 35
d) 25, 35, 45
Answer:
The correct answer is c) 35, 45, 35.
Bromine has 35 protons and electrons, and 45 neutrons (80 – 35 = 45).
Question 7: Which formula is used to determine the number of neutrons in an atom?
a) Atomic number + Number of electrons
b) Mass number – Number of protons
c) Mass number + Atomic number
d) Mass number – Atomic number
Answer:
The correct answer is d) Mass number – Atomic number.
The number of neutrons is found by subtracting the atomic number from the mass number.
Question 8: The value of A and Z can be:
a) Negative
b) Fractional
c) Zero
d) Whole number
Answer:
The correct answer is d) Whole number.
Atomic (Z) and mass (A) numbers are always whole numbers.
Question 9: The nucleus of an atom contains electrons and protons.
a) True
b) False
Answer:
The correct answer is b) False.
The nucleus contains protons and neutrons, not electrons.
Question 10: The nucleus of deuterium consists of:
a) 1 proton + 1 neutron
b) 1 proton + 3 neutrons
c) 1 proton + 0 neutrons
d) 1 proton + 2 neutrons
Answer:
The correct answer is a) 1 proton + 1 neutron.
Deuterium, an isotope of hydrogen, has 1 proton and 1 neutron in its nucleus.
Question 11: A maximum sum of the number of neutrons and protons in an isotope of hydrogen is 3.
a) True
b) False
Answer:
The correct answer is a) True.
In the isotope tritium, the sum of protons and neutrons is 3 (1 proton + 2 neutrons).
