Oxidation Number

Q.

The oxidation number of an element can be zero.

1. True

2. False

Q.

Define the following terms.

Valency

Q.

An element which never has a positive oxidation number in any of its compounds

1. Boron

2. Oxygen

3. Chlorine

4. Fluorine

Q. Find the oxidation number of the elements in the following compounds.
a. $\text{C}$ in ${\text{CO}}_2$
b. $\text{Mn}$ in ${\text{MnSO}}_4$
c. $\text{N}$ in ${\text{HNO}}_3$ [3 Marks]