Halogens and Their Reactivity

The video tutorial explores the halogens in group seven of the periodic table, focusing on their properties and reactivity. It discusses the non-metallic elements iodine, bromine, chlorine, and fluorine, highlighting their occurrence in nature and common compounds. The video demonstrates the reactivity of these halogens with iron wool and aluminium, showing how they differ in their reactions. Chlorine is shown to be highly reactive, while fluorine is too dangerous to handle. The tutorial provides a comparative analysis of the reactivity of halogens, emphasizing their position in the periodic table.

Which group of the periodic table do halogens belong to?

• Group 1

• Group 7

• Group 3

• Group 5

Which halogen is found as crystals of calcium fluoride in nature?

• Iodine

• Chlorine

• Bromine

• Fluorine

What is the commonest chlorine compound found in nature?

• Potassium chloride

• Calcium chloride

• Magnesium chloride

• Sodium chloride

Which halogen is a dense, poisonous reddish-brown liquid?

• Fluorine

• Chlorine

• Bromine

• Iodine

Where are iodine compounds commonly found?

• In soil

• In the atmosphere

• In seaweed

• In rocks

What happens to iron wool when it reacts with iodine?

• It turns into a gas

• It becomes coated with reddish-brown iron iodide

• It melts

• It remains unchanged

Which halogen is more reactive than iodine but less reactive than chlorine?

• Astatine

• Bromine

• Neon

• Fluorine

What is used to generate a stream of chlorine gas in the experiment?

• Concentrated nitric acid

• Concentrated hydrochloric acid

• Concentrated acetic acid

• Concentrated sulfuric acid

What is the result of the reaction between chlorine and aluminum foil?

• Formation of aluminum iodide

• Formation of aluminum bromide

• Formation of aluminum chloride

• Formation of aluminum oxide

What is required to initiate the reaction between iodine and aluminum powder?

• A drop of water

• A spark

• A drop of acid

• A piece of magnesium