Questions on Halogens (Group 17 Elements)
Multiple-Choice Questions: Halogens (Group 17 Elements)
General Properties & Trends
1. Which of the following is a halogen?
A) Oxygen
B) Nitrogen
C) Chlorine
D) Calcium
E) Helium
2. Halogens are located in which group of the periodic table?
A) Group 1
B) Group 2
C) Group 16
D) Group 17
E) Group 18
3. Which halogen is a liquid at room temperature?
A) Fluorine
B) Iodine
C) Chlorine
D) Bromine
E) Astatine
4. Which of the following halogens is the most electronegative?
A) Iodine
B) Chlorine
C) Bromine
D) Astatine
E) Fluorine
5. Which of the following best describes halogens?
A) Highly reactive metals
B) Inert gases
C) Moderately reactive metals
D) Highly reactive nonmetals
E) Poor conductors of heat but good conductors of electricity
Chemical Behavior
6. Halogens typically form which type of ions?
A) +1
B) –1
C) +2
D) –2
E) 0
7. Which halogen is often used to disinfect drinking water?
A) Bromine
B) Iodine
C) Chlorine
D) Fluorine
E) Astatine
8. Which halogen is added to toothpaste to help prevent cavities?
A) Fluorine
B) Bromine
C) Iodine
D) Chlorine
E) Astatine
9. Halogens exist naturally as:
A) Monatomic gases
B) Polyatomic ions
C) Diatomic molecules
D) Tetraatomic molecules
E) Complex salts
10. What is the trend in reactivity of halogens as you go down the group?
A) Reactivity increases
B) Reactivity remains constant
C) Reactivity decreases
D) Reactivity alternates
E) Reactivity increases then decreases
Physical States & Appearance
11. Which of the following halogens is a solid at room temperature?
A) Chlorine
B) Fluorine
C) Iodine
D) Bromine
E) All are gases
12. What is the color of chlorine gas?
A) Violet
B) Pale yellow
C) Greenish-yellow
D) Orange-red
E) Blue
13. Which halogen is the rarest and most radioactive?
A) Fluorine
B) Iodine
C) Chlorine
D) Astatine
E) Bromine
14. Which halogen is commonly used as an antiseptic in medical applications?
A) Chlorine
B) Fluorine
C) Bromine
D) Iodine
E) Astatine
15. What is the physical state of fluorine at room temperature?
A) Solid
B) Liquid
C) Gas
D) Plasma
E) Depends on pressure
Uses and Applications
16. Which halogen is used in halogen lamps?
A) Fluorine
B) Chlorine
C) Bromine
D) Iodine
E) Astatine
17. The term "halogen" means:
A) Water-forming
B) Salt-forming
C) Fire-generating
D) Light-emitting
E) Gas-producing
18. Halogens react with metals to form:
A) Oxides
B) Nitrides
C) Sulfides
D) Halides
E) Hydroxides
19. Why is fluorine more reactive than iodine?
A) Larger atomic radius
B) Lower ionization energy
C) Smaller atomic radius and stronger electronegativity
D) Fluorine is metallic
E) Fluorine has more protons
20. Which of the following halogens has the highest boiling point?
A) Fluorine
B) Chlorine
C) Bromine
D) Iodine
E) Astatine
- Questions on Metalloids
- Questions on Hydrogen and Alkali Metals
- Questions on Alkaline Earth Metals (Group 2)
Answers and Extended Explanations
1. C – Chlorine
→ Chlorine is a halogen, along with fluorine, bromine, iodine, and astatine.
2. D – Group 17
→ Halogens are in Group 17 of the periodic table.
3. D – Bromine
→ Bromine is a red-brown liquid at room temperature.
4. E – Fluorine
→ Fluorine is the most electronegative element in the periodic table.
5. D – Highly reactive nonmetals
→ Halogens readily gain electrons to form –1 ions.
6. B – –1
→ Halogens gain one electron to complete their outer shells.
7. C – Chlorine
→ Chlorine is widely used to disinfect municipal water supplies.
8. A – Fluorine
→ Fluoride ions help prevent dental decay and are added to toothpaste.
9. C – Diatomic molecules
→ Halogens naturally exist as X₂ (e.g., Cl₂, F₂).
10. C – Reactivity decreases
→ As you go down the group, the reactivity of halogens decreases.
11. C – Iodine
→ Iodine is a shiny, violet-black solid at room temperature.
12. C – Greenish-yellow
→ Chlorine gas has a distinct greenish-yellow color.
13. D – Astatine
→ Astatine is radioactive and very rare.
14. D – Iodine
→ Iodine is used as an antiseptic due to its antimicrobial properties.
15. C – Gas
→ Fluorine is a pale yellow gas at room temperature.
16. D – Iodine
→ Iodine vapor is used in halogen lamps to increase lifespan and brightness.
17. B – Salt-forming
→ “Halogen” comes from Greek: halos (salt) and genes (forming).
18. D – Halides
→ Halogens form halide salts when reacting with metals (e.g., NaCl).
19. C – Smaller atomic radius and stronger electronegativity
→ Fluorine attracts electrons more strongly than iodine.
20. E – Astatine
→ Astatine, being the heaviest, has the highest boiling point among halogens.
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