Catalytic Hydrogenation

Q.

when$S{O}_2$ is passed in a solution of potassium iodate, the oxidation state of iodine changes from :

1. +5 to 0

2. +5 to -1

3. -5 to 0

4. -7 to -1

Q.

Zn is the oxidant in the following reaction

$Zn\left(s\right)+\frac{1}{2}{O}_2⟶ZnO\left(s\right)$

1. True

2. False

Q.

Oxidant and Reductanct in the following reactions are respectively

$10H^{+}\left(aq\right)+4Zn\left(s\right)+N{O}_3^{-}\left(aq\right)\to 4Z{n}^{2+}\left(aq\right)+N{H}_4^{+}\left(aq\right)+3H_{2}O\left(l\right)$

1. Zn , N

2. O, Zn

3. N, Zn

4. Zn, O

Q. The oxidation state of $I$ in $H_{4}I{O}_6^{-}$ is

1. + 5
2. + 1
3. - 1
4. + 7

Q. The oxide which cannot act as a reducing agent is

1. 
2. 
3. 
4. 

Q. The oxidation number of C in $C{O}_2$ is

1. –4
2. 4
3. –2
4. 2

Q.

The oxidation state of $S$ in $N{a}_2{S}_2{O}_3$ is

1. +5

2. -1

3. 0

4. +2

Q. Sulphur has highest oxidation state in

1. 
2. 
3. 
4. 

Q. $HN{O}_2$ acts both as reductant and oxidant, while $HN{O}_3$ acts only as oxidant. It is due to their

1. Minimum oxidation number
2. Minimum number of valence electrons
3. Maximum oxidation number
4. Solubility ability

Q. Oxidation number of oxygen in ozone $\left(O_3\right)$ is

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