9th Class Chemistry Chapter Two Atomic Structure Solved MCQs PDF
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Today, We are going to share the notes prepared from the 9th Class Chapter Two Atomic Structure.
If you are looking for 9th Class Chemistry Chapter Two Atomic Structure MCQs with Answers, then you are at the right page.
Here you will get the 9th Class Chemistry solved MCQS of the 2nd Chapter "Atomic Structure" MCQs with Answers from the Textbook.
Note: We have also uploaded 9 class Chemistry handwritten notes below.
9th Class 2nd Chapter Chemistry MCQs with Answers
In 9th Class Chemistry 2nd Chapter, There are huge number of Multiple Choice Questions (MCQs).
But, We have written most important MCQs which repeats every year in the examinations.
Here are the most repeated MCQs from the 2nd Chapter (Atomic Structure) of the Class 9 Chemistry Textbook.
01. Only a scanning tunneling microscope can see atoms because they are so ________.
A. Large
B. Charged
C. Small
D. Electronic
Answer: C
A scanning tunneling microscope (STM) is a type of microscope used to capture atomic-level images of surfaces.
2. In 1911, ____ conducted an experiment to determine how the protons and electrons were arranged in an atom.
A. Schrodinger
B. Rutherford
C. Bohr
D. Newton
Answer: B
3. Rutherford used ____ particles to pelt a piece of very thin gold foil.
A. Alpha
B. Beta
C. Gamma
D. Tera
Answer: A
4. Rutherford utilized alpha particles produced by the fusion of
A. Boron
B. Silicon
C. Tin
D. Polonium
ANSWER : D
5. Only one Alpha particle out of every million in Rutherford's experiment was diverted from its intended course by an angle greater than ___.
A. 97°
B. 90°
C. 180°
D. 100°
Answer: B
6. He (Rutherford) presented a _____ model for an atom based on his experiment.
A. Geological
B. Mathematical
C. Planetary
D. None of these
Answer: C
7. According to classical physics, an electron will release energy as it revolves around the nucleus since it is a charged particle.
A. Continuously
B. Discontinuously
C. Slowly
D. Both b & c
Answer: A
8. A rotating electron should produce a _______ spectrum if it constantly emits energy.
A. Line
B. Continuous
C. Atomic
D. None of the above
Answer: B
White light is divided into seven different colors when it passes through a prism.
Continuous spectrum: In a continuous spectrum, the various hues blend rather than being separated by dark areas.
Line Spectrum: In the line spectrum, distinct colors are distinguished by black areas rather than blending.
09. Each orbit, in Bohr's view, possesses a certain energy.
A. Fixed
B. Variable
C. Large
D. Minute
ANSWER: A
10. According to Bohr, an electron's energy is directly inversely proportionate to how far away it is from the nucleus.
A. size
B. distance
C. electronegativity
D. none of the above
Answer: B
11. Value of Plank’s constant is ____
A. 6.626×10-34 J.s
B. 5.52×1034J.s
C. 9.011×10-31J.s
D. 1.6011×1016 J.s
Answer: A
12. Which particle is the lightest in the following:?
A. Neutron
B. particles
C. Electron
D. Proton
Answer: C
13. An electron's presence in a specific orbit does not affect energy.
A. absorbs
B. radiates
C. emits
D. all of these
Answer: D
14. According to Bohr mvr =
A. nh/2V
B. nh/4Ï€
C. nh/4V
D. nh/2Ï€
ANSWER: D
15. Which particles are heavier than others.?
A. Particles
B. Proton
C. Neutron
D. Electron
Answer: C
16. Which of the following is true for isotopes?
A. they have the same number of neutron
B. they have the same atomic mass
C. they have the same atomic number
D. all of these
Answer: C
17. Isotopes have different atomic masses due to:
A. different number of electrons
B. the different number of protons
C. different number of neutron
D. different atomic number
Answer: C
18. Isotopes are ____ alike.
A. chemically
B. physically
C. neutral
D. none of the above
ANSWER: A
19. According to the presumption, atoms are neither created nor destroyed during chemical reactions.
A. Dalton
B. Rutherford
C. Bohr's
D. Democritus
Answer: A
20. Atomic mass can also be called ___.
A. electron affinity
B. mass number
C. nucleon number
D. both b & c
Answer: D
21. The term "isotope" was initially used by:
A. Einstein
B. Soddy
C. Newton
D. G.N Lewis
ANSWER: B
22. Hydrogen has __ isotopes.
A. 4
B. 6
C. 3
D. 5
Answer: C
23. The number of neutrons in Tritium is?
A. 0
B. 1
C. 2
D. 3
Answer: C
24. Melting point of heavy water is __ °C.
A. 0
B. 3.81
C. 4.3
D. 5.4
Answer: B
Heavy water (D2O) is also referred to as deuterium oxide.
25. What is the number of isotopes of carbon?
A. 2
B. 4
C. 3
D. 6
Answer: C
26. Natural abundance of C-12 = ______
A. 98.8%
B. 99%
C. 97%
D. 99.7
Answer: A
27. Chlorine contains how many isotopes?
A. 3
B. 4
C. 5
D. 2
Answer: D
28. The e/m ratio of the ---------- rays varies with the nature of the gas in the discharged tube.?
A. Positive rays
B. Cathode rays
C. Gamma rays
D. Beta rays
Answer: A
29. In Water, Chlorine is fair ______.
A. Insoluble
B. Soluble
C. Reactive
D. None of these
Answer: B
30. Chlorine is a greyish ___ gas that has a harsh, pungent, and unpleasant smell.
A. Pink
B. Blue
C. Red
D. Yellow
Answer: D
31. It has __ number of neutrons if Uranium (234U) has 92 protons.
A. 142
B. 134
C. 122
D. none of the above
Answer: A
32. to identify ___ issue, radioactive iodine-131 is employed as a tracer.
A. ulcer
B. lungs
C. heart
D. thyroid
Answer: D
33. ___ Cells are frequently exposed to cobalt-60 radiation in the hopes of destroying or reducing tumors.
A. nerve
B. red blood cells
C. cancer
D. white blood cells
Answer: C
34. The distance between an electron and the nucleus and the energy of the shell grows with increasing "n" value.
A. increases
B. decreases
C. stays the same
D. All of these
Answer: A
35. How many electrons can be accommodated in S sub-shell?
A. 3
B. 4
C. 2
D. 6
Answer: C
36. which electromagnetic waves were refracted towards the negative pole?
A. Alpha rays
B. Cathode rays
C. Beta rays
D. Gamma rays
Answer: A
37. Radioactive rays are of?
A. 3 types
B. 6 types
C. 4 types
D. 2 types
Answer: A
38. Chemical properties of an element depend on the ---------- in the shells?
A. Protons
B. Neutrons
C. Electrons
D. None of them
Ans: C
39. The symbol for the atomic number, which indicates the number of protons or electrons in an atom, is?
A. Z
B. M
C. A
D. N
Answer: A
40. The maximum number of electrons in a shell is found by the formula?
A. 2n²
B. n
C. n²
D. 2n
Answer: A
41. Which of the following Sub-Shell is spherical shaped?
A. s
B. p
C. d
D. f
Answer: A
42. Which of the following Sub-Shell has a very complicated shape?
A. s
B. p
C. d
D. f
Answer: D
43. Which of the following is used to make Heavy water?
A. Protium
B. Deuterium
C. Tritium
D. None of these
Answer: B
44. What is the Boiling point of water?
A. 101°C
B. 100°C
C. 102°C
D. 103°C
Answer: B
45. When cathode rays hit an object, they produce?
A. Sound
B. Darkness
C. Effervescence
D. Fluorescence
Answer: D
46. Shell _____ has the lowest energy?
A. L
B. N
C. M
D. K
Answer: D
47. How much heavier is a proton than an electron?
A. 1936 Times
B. 1836 Times
C. 1636 Times
D. 1736 Times
Answer: B
48. d Sub shell has ___ shape.
A. spherical
B. dumbbell
C. double dumbbell
D. none of them
Answer: C
49. Which subshell will the electron enter first, keeping in mind the Auf Bau principle?
A. 3s
B. 1s
C. 2s
D. 4s
Answer: B
50. A neutron has a mass equal to a proton and it has?
A. No charge
B. Negative charge
C. Double positive charge
D. Positive charge
Answer: A
Frequently Asked Questions (FAQs)
Q.01: What is atomic structure?
Answer: The term "atomic structure" describes the basic elements that make up an atom, which is its nucleus, which is made up of protons and neutrons, and its electron shells, which orbit around it.
Q.02: What are the subatomic particles?
Answer: Electrons, Protons, and Neutrons are Known as Sub-Atomic Particles.
In other words, Atom is made up of Sub-Atomic Particles.
Q.03: What is an isotope?
Answer: A variation of an element known as an isotope has a different atomic mass but the same number of protons and neutrons.
Q.04: Define the difference between atomic number and atomic mass.
Answer: Atomic Number: The amount of protons in the nucleus of an element determines its atomic number
Atomic Mass: The sum of the protons and neutrons in the nucleus determines its atomic mass.
Q.05: What is the significance of the electron configuration?
Answer: An atom's chemical properties, such as its reactivity and the kinds of bonds it may form with other atoms, are determined by the arrangement of its electrons.
Q.06: How do we distinguish between elements in the periodic table?
Answer: The atomic number, which rises from left to right and top to bottom, distinguishes the elements in the periodic table.
Chemistry Class 9: Chapter Two “Atomic Structure” solved Handwritten Notes
Usually, Students prefer handwritten notes. Therefore, We will also provide them these notes.
Here are solved the 9th class Chemistry second chapter Atomic Structure handwritten notes.
But, You can also read the solved exercise of the 9th Class Chemistry Chapter Two from the Sindh Textbook.
Students are advised to study from below-given hand written notes of 9th class Chemistry 2nd Chapter 'Atomic Structure'.
Here are the Solved MCQs from the 9th Class Chemistry 2nd Chapter Textbook Exercise.
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