Calculating Oxidation Number

Q.

What is the difference between iodometric and iodimetric titration?

Q.

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

1. +3

2. -3

3. +5

4. -5

Q.

In the reaction ${\mathrm{PCl}}_3+{\mathrm{Cl}}_2\to {\mathrm{PCl}}_5$

1. ${\mathrm{PCl}}_3$ is acting as reductant.

2. ${\mathrm{Cl}}_2$ is acting as reductant.

3. Both ${\mathrm{PCl}}_3$ and ${\mathrm{Cl}}_2$are acting as reductant.

4. Both ${\mathrm{PCl}}_3$ and ${\mathrm{Cl}}_2$are acting as oxidant.

Q.

What is the oxidation number of $\mathrm{Na}$?

Q.

Among the following elements, which is the strongest reducing agent?

1. Lithium

2. Beryllium

3. Chlorine

4. Magnesium

Q.

Which is a stronger reducing agents $\mathrm{Cu}$ or $\mathrm{Zn}$ ?

Q.

What is the oxidation number of manganese in $M{n}_2{O}_7$?

1. +7

2. +6

3. -6

4. -7

Q.

Write the equations for the controlled oxidation of methane to form the formaldehyde.

Q.

What is the weakest oxidizing agent?

Q.

The pair of compounds having metals in their highest oxidation state is

1. MnO^-₄, Cro₂Cl₂

2. [Fe(CN)₆]^3-, [CO(CN)₃]

3. [NiCl₄]^2-, [COCl₄]^-

4. MnO₂, FeCl₃

Q.

What are the oxidation numbers of oxygen? Give an example

Q.

Give a reason for the following:

${\mathrm{PCl}}_5$ acts as an oxidising agent.

Q.

The oxidation number of sulphur in sulphur dioxide$S{O}_2$ and sulphuric acid$H_{2}S{O}_4$ is respectively

1. +6 and +4

2. +6 and +6

3. +4 and +4

4. +4 and +6

Q. Metal oxide has formula M0.98 O.metal is present in M+2 and in +3 oxidation state.fraction of metal exist as M+3 would be?

Q.

Assertion (A): Elements with greater electron affinities are better oxidizing agents.

Reason (R): Oxidation is the gaining of electrons.

1. Both A and R are true and R is the correct explanation of A.

2. Both A and R are true, but R is not the correct explanation of A.

3. A is true and R is false.

4. A is false and R is true.

Q.

Determine the oxidation number of Phosphorous in $H_{3}P{O}_4$.

1. $+5$

2. $+4$

3. $+3$

4. $+2$

Q.

Which is the weakest oxidising agent among the following?

1. O2

2. I2

3. None of these

4. KMnO4

Q.

Which element in the square brackets has the highest oxidation number among the given options?

1. $H_2\left[C\right]O_3$

2. $\left[Mg\right]C{l}_2$

3. $H_3\left[P\right]O_4$

4. $K_2\left[C{r}_2\right]O_7$

Q. Potassium (at No.19) and chlorine (at No.17) form a compound. Explain the formation of the compound on the basis of ​ ​

(c) oxidizing agent

Q.

What is the oxidation number of Mn in $KMn{O}_4$?

1. +6

2. +7

3. +4

4. +5

Q.

In the reaction $2Ag+2H_{2}S{O}_4\to A{g}_{2}S{O}_4+2H_{2}O+S{O}_2$ sulphuric acid acts as

1. An oxidizing agent

2. A reducing agent

3. An acid as well as an oxidant

4. A catalyst

Q.

Which is not an electrophile?

Q.

Which of the following elements have the ability to behaves as both oxidising and reducing agents?

1. H₂SO₄

2. SO₂

3. H₂S

4. HNO₃

Q.

In the reaction $2FeC{l}_2+C{l}_2\to 2FeC{l}_3$, Chlorine may be regarded as:

1. Oxidising agent

2. Reducing agent

3. Catalyst

4. None of the above

Q. If $M^{+3}$ ion gains $2e^{-}$. Its oxidation number will be

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

Q.

Calculate n-factor of $N{a}_{3}P{O}_4$ in the following reaction.

$N{a}_{3}P{O}_4$ +$3BaC{l}_2$ $\to$ 6NaCl + $B{a}_3(P{O}_4{)}_2$

1. 2

2. 3

3. 4

4. 6

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.

In the reaction
$C_2{O}_4^{2-}+Mn{O}_4^{-}+H^{+}\to M{n}^{2+}+C{O}_2+H_{2}O$ which is the reducing agent?

1. $C_2{O}_4^{2-}$

2. $Mn{O}_4^{-}$

3. $M{n}^{2+}$

4. $H^{+}$

Q.

$H_2{O}_2$ is used as what?

1. An oxidant only

2. A reductant only

3. An acid only

4. An oxidant, a reductant and an acid

Q. A metal ion $M^{3+}$ loses 3 electrons. What is the resulting oxidation number of the metal ion?

1. 6
2. 3
3. 0
4. -3