Displacement Reactions & Reactions In Solutions

What is the main reason rubidium can displace sodium in a displacement reaction?

• Rubidium is less reactive than sodium.

• Rubidium can donate its outer electron more easily than sodium.

• Rubidium has a lower atomic number than sodium.

• Rubidium forms a covalent bond with chloride.

Why is it valuable to displace less reactive metals like silver from their compounds?

• They are used in making explosives.

• They are abundant and cheap.

• They are precious and have high economic value.

• They react violently with water.

What happens when bromine is added to a sodium iodide solution?

• The solution turns colorless.

• The solution remains unchanged.

• The solution turns dark brown due to the formation of diatomic iodine.

• The solution turns blue.

In the context of displacement reactions, why do iodine atoms pair up to form diatomic molecules?

• To react with water molecules.

• To increase their reactivity.

• To achieve stability by completing their octet.

• To form a new compound with bromine.

What is the role of magnesium in the thermite reaction?

• It acts as a catalyst.

• It forms a protective layer over the reactants.

• It displaces iron from iron oxide.

• It provides the heat needed to start the reaction.