Atom & its Structure MCQ Quiz – Part 2
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This Atom & its Structure MCQ Quiz helps aspirants revise important concepts related to the structure of atoms, subatomic particles, and atomic models, which are frequently asked in competitive exams. Regular practice of these MCQs improves conceptual understanding and helps candidates answer chemistry questions quickly and accurately.
GK Series – Chemistry – Atom & its Structure MCQ Quiz |
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| Subject | Chemistry |
| Chapter | Atom & its Structure |
| Part | 2 |
| Questions | 25 |
Who Should Attempt This Atom & its Structure MCQ Quiz?
This Atom & its Structure MCQ Quiz is useful for aspirants preparing for SSC, Railways, Defence, and other government job exams, where basic chemistry questions are commonly asked in the General Knowledge section.
Topics Covered in This Atom & its Structure MCQ Quiz
This Atom & its Structure MCQ Quiz is useful for aspirants preparing for SSC, Railways, Defence, and other government job exams, where basic chemistry questions are commonly asked in the General Knowledge section.
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Question 1 of 25
1. Question
Which of the following is correct representation?
Correct
➤ Mass number = protons + neutrons.
➤ Atomic number = protons only.Incorrect
➤ Mass number = protons + neutrons.
➤ Atomic number = protons only. -
Question 2 of 25
2. Question
The maximum number of electrons in L shell is
Correct
➤ Using 2n² formula
➤ For n=2 → 2×(2²)=8 electrons.Incorrect
➤ Using 2n² formula
➤ For n=2 → 2×(2²)=8 electrons. -
Question 3 of 25
3. Question
Maximum electrons in M shell is
Correct
➤ For n=3 → 2×(3²)=18 electrons.
Incorrect
➤ For n=3 → 2×(3²)=18 electrons.
-
Question 4 of 25
4. Question
Which shell is closest to the nucleus?
Correct
➤ K shell (n=1) is innermost.
➤ Lowest energy level (ground state).Incorrect
➤ K shell (n=1) is innermost.
➤ Lowest energy level (ground state). -
Question 5 of 25
5. Question
Valence electrons are present in
Correct
➤ Valence electrons determine reactivity.
➤ Important for bonding.Incorrect
➤ Valence electrons determine reactivity.
➤ Important for bonding. -
Question 6 of 25
6. Question
Charged species formed by gain or loss of electrons are called
Correct
➤ Ions are charged particles.
➤ Formed by loss or gain of electrons.Incorrect
➤ Ions are charged particles.
➤ Formed by loss or gain of electrons. -
Question 7 of 25
7. Question
A negatively charged ion is called
Correct
➤ Anion = gain of electrons → negative charge.
Incorrect
➤ Anion = gain of electrons → negative charge.
-
Question 8 of 25
8. Question
A positively charged ion is called
Correct
➤ Cation = loss of electrons → positive charge.
Incorrect
➤ Cation = loss of electrons → positive charge.
-
Question 9 of 25
9. Question
Sodium (Na) forms which ion?
Correct
➤ Sodium loses 1 electron → Na⁺.
➤ Becomes stable.Incorrect
➤ Sodium loses 1 electron → Na⁺.
➤ Becomes stable. -
Question 10 of 25
10. Question
Chlorine (Cl) forms which ion?
Correct
➤ Chlorine gains 1 electron → Cl⁻.
Incorrect
➤ Chlorine gains 1 electron → Cl⁻.
-
Question 11 of 25
11. Question
Electronic configuration of Sodium (11) is
Correct
➤ 11 electrons → 2,8,1.
➤ Valency = 1.Incorrect
➤ 11 electrons → 2,8,1.
➤ Valency = 1. -
Question 12 of 25
12. Question
Electronic configuration of Magnesium (12) is
Correct
➤ 12 electrons → 2,8,2.
➤ Valency = 2.Incorrect
➤ 12 electrons → 2,8,2.
➤ Valency = 2. -
Question 13 of 25
13. Question
Valency of Oxygen (8) is
Correct
➤ Configuration = 2,6
➤ Needs 2 electrons → valency = 2.Incorrect
➤ Configuration = 2,6
➤ Needs 2 electrons → valency = 2. -
Question 14 of 25
14. Question
Valency of Neon (10) is
Correct
➤ Configuration = 2,8
➤ Stable → valency = 0.Incorrect
➤ Configuration = 2,8
➤ Stable → valency = 0. -
Question 15 of 25
15. Question
Which of the following has variable valency?
Correct
➤ Phosphorus shows 3 and 5 valency.
Incorrect
➤ Phosphorus shows 3 and 5 valency.
-
Question 16 of 25
16. Question
Atoms of the same element with same atomic number but different mass numbers are called
Correct
➤ Isotopes → same Z, different A.
➤ Difference due to neutrons.Incorrect
➤ Isotopes → same Z, different A.
➤ Difference due to neutrons. -
Question 17 of 25
17. Question
Isotopes differ in
Correct
➤ Same protons, different neutrons.
➤ Hence different mass.Incorrect
➤ Same protons, different neutrons.
➤ Hence different mass. -
Question 18 of 25
18. Question
Which of the following is an isotope pair?
Correct
➤ Both have Z=6 but different mass numbers.
Incorrect
➤ Both have Z=6 but different mass numbers.
-
Question 19 of 25
19. Question
Isotopes have
Correct
➤ Same valence electrons → same chemical properties.
➤ Physical properties differ.Incorrect
➤ Same valence electrons → same chemical properties.
➤ Physical properties differ. -
Question 20 of 25
20. Question
Which isotope is used in treatment of cancer?
Correct
➤ Cobalt-60 used in radiotherapy.
Incorrect
➤ Cobalt-60 used in radiotherapy.
-
Question 21 of 25
21. Question
Which isotope is used in nuclear reactors?
Correct
➤ U-235 used as nuclear fuel.
➤ Fission reaction.Incorrect
➤ U-235 used as nuclear fuel.
➤ Fission reaction. -
Question 22 of 25
22. Question
Atoms having same mass number but different atomic numbers are called
Correct
➤ Isobars → same A, different Z.
➤ Different elements.Incorrect
➤ Isobars → same A, different Z.
➤ Different elements. -
Question 23 of 25
23. Question
Isotones are atoms having same
Correct
➤ Isotones → same neutrons.
➤ Different atomic number.Incorrect
➤ Isotones → same neutrons.
➤ Different atomic number. -
Question 24 of 25
24. Question
Which of the following pair represents isobars?
Correct
➤ Same mass number (40), different elements.
Incorrect
➤ Same mass number (40), different elements.
-
Question 25 of 25
25. Question
Which property differs in isotopes?
Correct
➤ Different mass → different density, boiling point etc.
➤ Chemical properties same.Incorrect
➤ Different mass → different density, boiling point etc.
➤ Chemical properties same.