Rules for Assigning Oxidation Number and State

Q.

What is the oxidation number of phosphorus in phosphoric acid ( $H_{3}P{O}_4$)?

1. +5

2. +3

3. -3

4. -5

Q. What is the oxidation number of oxygen in ${\text{K}}_2\text{O}$?
(Oxidation number of potassium is +1)

1. -2

Q. The ratio of the oxidation state of P in $H_{3}P{O}_3$ and $H_{3}P{O}_4$ is

1. 2:5
2. 5:2
3. 3:5
4. 5:3

Q.

Select the options in which the elements given in the square bracket have the same oxidation number.

1. $K\left[Mn\right]O_4$

2. $\left[Mn\right]O_2$

3. $[Mn{]}_2{O}_3$

4. $[Mn{]}_2{O}_7$

Q.

Oxidation state of $H$ in $LiH$is

1. 1
2. -1
3. 2
4. -2

Q.

The oxidation number of hydrogen is -1 when it combines with non-metals and +1 when it combined with metals.

1. True

2. False

Q. The oxidation number of O is in ${\text{OF}}_2$ and in ${\text{H}}_2\text{O}$.

1. -2
2. 2
3. -1
4. 1
5. \N

Q.

The oxidation state of O in $O{F}_2$is:

1. -2

2. +2

3. -1

4. +1

Q.

Find the difference in oxidation numbers of sulphur in the $(S{O}_4{)}^{2-}$ ion and $S{O}_3$ compound.

1. 2
2. 0
3. -2
4. 1

Q. is the actual charge of an atom if it exists as a monoatomic ion.

1. Atomic number
2. Mass number
3. Oxidation number