Question

Write the individual oxidation numbers of each of the elements within the following neutral compounds.
1.HNO3
2. CaH2
3. Fe2O3
4. SiO2
5. KNO2

Answer 1

Answer:

Write the individual oxidation numbers of each of the elements within the following neutral compounds.

1.HNO3

2. CaH2

3. Fe2O3

4. SiO2

5. KNO2

answer is 4

Answer 2

Answer:

Let x be the oxidation number of N in nitric acid.

The oxidation numbers of H and O in nitric acid are +1 and −2 respectively. The sum of the oxidation numbers is zero for the neutral molecule.

Hence, 1+x+3(2−)=0

or, x=5