Compounds of Alkali Metals

The video tutorial explains the reactions of alkali metals with oxygen, forming oxides, peroxides, and superoxides. It discusses the stability and properties of these compounds, including their solubility in water and their behavior as strong bases. The tutorial also covers the formation and properties of alkali metal halides, highlighting their melting points and solubility trends. Additionally, it explores the reactions of alkali metals with oxoacids, emphasizing their electropositive nature and the formation of salts.

Why does lithium not form superoxides?

• It has a large atomic size.

• It has a strong positive field around its ion.

• It forms stable peroxides instead.

• It reacts too slowly with oxygen.

What happens when alkali metal oxides dissolve in water?

• They form carbonates.

• They form acids.

• They form salts.

• They form hydroxides.

What is the nature of alkali metal hydroxides?

• Weak acids

• Strong acids

• Weak bases

• Strong bases

Which alkali metal halide is known for its covalent nature?

• Sodium chloride

• Potassium iodide

• Lithium chloride

• Cesium bromide

What is the trend in the melting points of alkali metal halides from fluorides to iodides?

• Melting points remain constant.

• Melting points decrease.

• Melting points increase.

• Melting points vary randomly.

How do alkali metals react with oxoacids?

• They form oxides directly.

• They replace only acidic hydrogen atoms.

• They replace all hydrogen atoms.

• They do not react with oxoacids.

Why is lithium carbonate less stable to heat compared to other alkali metal carbonates?

• It forms a stable oxide and carbon dioxide.

• It does not react with heat.

• It has a larger atomic size.

• It has a high melting point.