Reactivity of Group 1 Metals

The video tutorial explores the reactivity of Group 1 metals: lithium, sodium, and potassium. These metals are highly reactive, requiring careful handling and storage under oil. Lithium is soft and tarnishes quickly when exposed to air. Sodium is even more reactive, producing hydrogen gas and an alkaline solution when reacting with water. Potassium is the most reactive among the three, igniting hydrogen gas upon contact with water. The video also discusses the expected reactivity of rubidium and cesium, which are positioned below potassium in the periodic table.

Why do Group 1 metals need to be stored under oil?

• They are radioactive.

• They are highly reactive with air.

• They are very dense.

• They are very expensive.

Which of the following metals is soft enough to be cut with a knife?

• Aluminum

• Copper

• Lithium

• Iron

What happens to the freshly cut surface of lithium when exposed to air?

• It becomes shiny.

• It remains unchanged.

• It tarnishes quickly.

• It melts.

What gas is produced when lithium reacts with water?

• Carbon dioxide

• Hydrogen

• Nitrogen

• Oxygen

What is the nature of the solution formed when lithium reacts with water?

• Salty

• Acidic

• Neutral

• Alkaline

What compound is formed when sodium reacts with water?

• Sodium carbonate

• Sodium hydroxide

• Sodium chloride

• Sodium sulfate

How does sodium's reactivity with water compare to lithium's?

• Sodium is more reactive.

• Sodium is less reactive.

• Sodium is equally reactive.

• Sodium does not react.

What happens to the hydrogen gas produced when potassium reacts with water?

• It turns into oxygen.

• It ignites spontaneously.

• It dissolves in water.

• It forms a solid.

What color does the Universal indicator turn when potassium reacts with water?

• Red

• Green

• Blue

• Yellow

Which elements are expected to be more reactive than potassium in Group 1?

• Rubidium and cesium

• Calcium and magnesium

• Boron and aluminum

• Carbon and silicon