Here we are providing assertion reason questions for class 9 science. This article covers assertion reason questions based on Class 9 Science Chapter 4 Structure of Atom. To check the answer, click on ‘answer’ given below each question. After clicking it will expand.
Table of Contents
Assertion and Reason Questions for Class 9 Science Chapter 4 Structure of Atom
Q.1. Assertion: For noble gases, valency is zero.
Reason: Noble gases have 8 valence electrons.
Answer
Answer: (a)Q.2. Assertion: Thomson’s atomic model is known as ‘raisin pudding’ model.
Reason: The atom is visualized as a pudding of positive charge with electrons (raisins) embedded in it.
Answer
Answer: (a)Q.3. Assertion: The mass of the total number of protons and neutrons is a measure of the approximate mass of an atom.
Reason: The mass of an electron is negligible.
Answer
Answer: (a)Q.4. Assertion: Electrons moving in the same orbit will lose or gain energy.
Reason: On jumping from higher to lower energy level, the electron will gain energy
Answer
Answer: (d)Q.5. Assertion: Isotopes are electrically neutral.
Reason: Isotopes are species with same mass number but different atomic numbers
Answer
Answer: (c)Q.6. Assertion: Atom is electrically neutral.
Reason: A neutral particle, neutron is present in the nucleus of atom.
Answer
Answer: (b)Q.7. Assertion: The size of the nucleus is very small as compared to the size of the atom.
Reason: The electrons revolve around the nucleus of the atom
Answer
Answer: (b)Q.8. Assertion: Isotopes are electrically neutral.
Reason: Isotopes of an element have equal number of protons and electrons.
Answer
Answer: (a)Q.9. Assertion: Isobars are identical in chemical properties.
Reason: Isobars have same atomic number.
Answer
Answer: (d)Q.10. Assertion: Anions are larger in size than the parent atom.
Reason: In an anion, the number of protons in the nucleus is less than the number of electrons moving around it
Answer
Answer: (a)Also Check
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