Chapter F, Problem K.21E

(a)

Interpretation Introduction

Interpretation:

Oxidation number of oxygen in ${\text{KO}}_{\text{2}}$ has to be found.

Concept Introduction:

Oxidation state of a species is the one that has a specified oxidation number.  Increase in oxidation number corresponds to oxidation while decrease in oxidation number corresponds to reduction.  Rules for assigning oxidation number for an element is given as follows;

• The oxidation number is zero for the element that is present in uncombined state.
• Sum of the oxidation number of the atoms that is present in it is equal to the charge on the species.
• Oxidation number of the element is the charge that is possessed when the more electronegative atom is imagined to be an ion.

(b)

Interpretation Introduction

Interpretation:

Oxidation number of hydrogen in ${\text{LiAlH}}_{\text{4}}$ has to be found.

Concept Introduction:

Refer part (a).

(c)

Interpretation Introduction

Interpretation:

Oxidation number of oxygen in ${\text{Na}}_{\text{2}}{\text{O}}_{\text{2}}$ has to be found.

Concept Introduction:

Refer part (a).

(d)

Interpretation Introduction

Interpretation:

Oxidation number of hydrogen in $\text{NaH}$ has to be found.

Concept Introduction:

Refer part (a).

(e)

Interpretation Introduction

Interpretation:

Oxidation number of oxygen in ${\text{KO}}_{\text{3}}$ has to be found.

Concept Introduction:

Refer part (a).