Chapter 8, Problem 8A.15E

(a)

Interpretation Introduction

Interpretation:

The hydride $\left(\text{LiH}\right)$ has to be classified as saline, metallic or molecular.

Concept Introduction:

Saline hydrides:

The elements present in group 1 and 2 form ionic compounds with hydrogen in which, the hydrogen is present as hydride ion $\left({\text{H}}^{\text{-}}\right)\text{.}$  These ionic compounds are known as saline hydrides.  Saline hydrides are formed by all the elements that are present in s-block except beryllium.

Molecular hydrides:  Nonmetals form covalent molecular hydride that comprises of discrete molecules.  These compounds are volatile and are bronsted acids.  These are mostly formed by elements of p-blocks.

Metallic hydrides:  Metallic hydrides are black, powdery, electrically conducting solids formed by heating certain elements of the d-block metals in hydrogen.  Metallic hydrides releases hydrogen gas when they are treated or heated with an acid.

(b)

Interpretation Introduction

Interpretation:

The hydride $\left({\text{NH}}_{\text{3}}\right)$ has to be classified as saline, metallic or molecular.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The hydride $\left(\text{HBr}\right)$ has to be classified as saline, metallic or molecular.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

The hydride $\left({\text{UH}}_{\text{3}}\right)$ has to be classified as saline, metallic or molecular.

Concept Introduction:

Refer to part (a).