Hydrides

The video tutorial explains the different types of hydrides: ionic, covalent, and metallic. Ionic hydrides, formed by alkali and alkaline earth metals, are powerful reducing agents and exhibit high melting points. Covalent hydrides, such as methane and ammonia, are volatile and do not conduct electricity. They can form hydrogen bonds, leading to high boiling points. Metallic hydrides, formed by transition metals, are used for hydrogen storage due to their ability to absorb hydrogen gas. The preparation methods for molecular hydrides include reduction and hydrolysis.

Which type of hydrides are formed by alkali and alkaline earth metals?

• Covalent hydrides

• Ionic hydrides

• Metallic hydrides

• Polymeric hydrides

What is a characteristic property of ionic hydrides?

• They have low melting points.

• They conduct electricity in solid state.

• They are volatile compounds.

• They are powerful reducing agents.

What type of bonds are present in electron-deficient hydrides?

• 3-center 2-electron bonds

• Double bonds

• Metallic bonds

• Ionic bonds

Which group of elements forms electron-rich hydrides?

• Group 14

• Group 15, 16, and 17

• Group 13

• Group 18

How are molecular hydrides typically prepared?

• By direct combination of elements

• By electrolysis of water

• By reducing a halide with a strong reducing agent

• By heating metals with hydrogen

What is the process called when interstitial hydrides absorb hydrogen gas?

• Hydrogenation

• Occlusion

• Sublimation

• Adsorption

What is a key feature of metallic hydrides?

• They have well-defined stoichiometries.

• They are considered as alloys.

• They are volatile liquids.

• They are poor conductors of electricity.