Chapter 22, Problem 22.20CP

Interpretation Introduction

(a)

Interpretation:

The formula of the simplest binary hydride of each element should be written.

Concept introduction:

The binary hydrides are compounds which contain hydrogen and one other element. Binary hydrides can be classified as ionic, covalent or metallic.

Interpretation Introduction

(b)

Interpretation:

The hydride with the lowest boiling point should be determined.

Concept introduction:

The binary hydrides are compounds which contain hydrogen and one other element. Binary hydrides can be classified as ionic, covalent or metallic. Covalent hydrides have lowest melting and boiling points because they have relatively weak intermolecular forces between molecules.

Interpretation Introduction

(c)

Interpretation:

The hydrides which reacts with water to give ${\text{H}}_2$ gas should be determined.

Concept introduction:

${\text{H}}^{-}$ ions are good proton acceptors. So, ionic hydrides react with water to give ${\text{H}}_2$ and ${\text{OH}}^{-}$

Interpretation Introduction

(d)

Interpretation:

The hydrides which react with water to give an acidic solution and basic solution should be determined.

Concept introduction:

If hydride reacts with water and form hydroxyl ions, then it gives a basic solution. If a hydride reacts with water and form hydronium ions, then it gives an acidic solution.