Which of the following halogens is the most reactive?

• Bromine

• Iodine

• Chlorine

• Fluorine

Halogens exist in which states at room temperature?

• Only gases

• Only liquids

• Only solids

• Solid, liquid, and gas

What is the electron configuration of chlorine (Cl)?

• 1s² 2s² 2p⁶ 3s² 3p⁵

• 1s² 2s² 2p⁶ 3s² 3p⁶

• 1s² 2s² 2p⁶ 3s² 3p³

• 1s² 2s² 2p⁶ 3s¹ 3p⁵

Which halogen is used in water purification?

• Fluorine

• Chlorine

• Bromine

• Iodine

The oxidation state of halogens in their elemental form is:

• 0

• -1

• +1

• -2

Which of the following halides is insoluble in water?

• NaCl

• KBr

• AgCl

• KI

Fluorine reacts explosively with hydrogen to form:

• Hydrogen fluoride

• Hydrogen chloride

• Hydrofluoric acid

• Hydrogen bromide

Which of these halogens sublimes upon heating?

• Fluorine

• Bromine

• Iodine

• Chlorine

Halogens react with metals to form:

• Acids

• Salts

• Bases

• Oxides

The most electronegative element in the periodic table is:

• Oxygen

• Chlorine

• Fluorine

• Bromine