41. Which halogen is used in the manufacture of bleach?

a) Iodine
b) Bromine
c) Fluorine
d) Chlorine
Answer: d) Chlorine

42. The property of noble gases that makes them useful in inert gas welding is:

a) Their high reactivity
b) Their ability to form strong bonds
c) Their non-reactivity
d) Their high density
Answer: c) Their non-reactivity

43. The only noble gas that can form a stable compound with fluorine is:

a) Helium
b) Neon
c) Argon
d) Xenon
Answer: d) Xenon

44. The halogen with the lowest boiling point is:

a) Chlorine
b) Bromine
c) Iodine
d) Fluorine
Answer: d) Fluorine

45. Which of the following noble gases is used in deep-sea diving equipment?

a) Argon
b) Neon
c) Krypton
d) Xenon
Answer: a) Argon

46. The physical state of chlorine at room temperature is:

a) Gas
b) Liquid
c) Solid
d) Plasma
Answer: a) Gas

47. The electronic configuration of fluorine is:

a) [He] 2s^2 2p^5
b) [Ne] 3s^2 3p^5
c) [Ne] 3s^2 3p^6
d) [Ar] 4s^2 3d^10
Answer: a) [He] 2s^2 2p^5

48. The property of noble gases that makes them suitable for use in neon lights is:

a) Their colorless nature
b) Their inertness
c) Their high reactivity
d) Their low density
Answer: b) Their inertness

49. Which halogen is used in the production of photographic films?

a) Iodine
b) Bromine
c) Chlorine
d) Fluorine
Answer: b) Bromine

50. The general trend in atomic radius for halogens as you move down the group is:

a) Decreases
b) Increases
c) Remains the same
d) Fluctuates
Answer: b) Increases