Oxidants and Reductants

Q.

Write the formula for Gypsum.

Q.

What happens when ${\mathrm{SO}}_2$ is passed in ${\mathrm{KMnO}}_4$ acidified solution?

Q.

Why ${\mathrm{SO}}_2$ can act as oxidizing as well as reducing agent but ${\mathrm{H}}_2\mathrm{S}$ act as only a reducing agent?

Q.

Write the chemical equation for the following

Cinnabar is roasted in a furnace.

Q.

$H_2{O}_2$ is used as

1. An oxidant only

2. A reductant only

3. An acid only

4. An oxidant, a reductant and an acid

Q.

What is the most powerful oxidizing agent?

Q.

During ionization metals lose electrons, this change can be called :

1. Oxidation

2. Reduction

3. Redox

4. Displacement

Q.

What are oxidizing agents?

Q.

Name the following:

The process in which an atom lose electron

Q.

Identify the correct statement about $H_2{O}_2$

1. It acts as reducing agent only

2. It acts as both oxidising and reducing agent

3. It is neither an oxidiser nor reducer

4. It acts as oxidising agent only

Q.

How Do You Identify A Reducing Agent?

Q. In which of the following reactions $H_2{O}_2$ is a reducing agent

1. $2FeC{l}_2+2HCl+H_2{O}_2\to 2FeC{l}_3+2H_{2}O$
2. $C{l}_2+H_2{O}_2\to 2HCl+O_2$
3. $2HI+H_2{O}_2\to 2H_{2}O+I_2$
   
4. $H_{2}S{O}_3+H_2{O}_2\to H_{2}S{O}_4+H_{2}O$

Q.

Explain the reactions:

$2KCl{O}_3+I_2\to 2KI{O}_3+C{l}_2$

Q.

Fill in the blank with the appropriate answer:

Zinc chloride solution reacts with caustic soda solution to give a _______ coloured precipitate.

Q. Identify the oxidising agent in the following reaction.
${\text{2Mg(s) +O}}_2\text{(g)}\underrightarrow{\text{Heat}}\text{2MgO(s)}$

1. ${\text{O}}_2$
2. Both $\text{Mg}$ and ${\text{O}}_2$
3. $\text{MgO}$
4. $\text{Mg}$

Q. manganese oxide and aluminium react to give manganese and aluminium oxide.which are the oxidizing and reducing agents

Q.

Equation $H_{2}S+H_2{O}_2\to S+2H_{2}O$ represents

1. Acidic nature of $H_2{O}_2$
2. Basic nature of $H_2{O}_2$
3. Oxidising nature of $H_2{O}_2$
4. Reducing nature of $H_2{O}_2$

Q. In $C+H_{2}O⟶CO+H_2,H_{2}O$ acts as a:

1. Oxidising agent

2. Reducing agent

3. None of these

4. (a) and (b) both

Q. $\left(I\right)H_2{O}_2+O_3\to H_{2}O+2O_2$
$\left(II\right)H_2{O}_2+A{g}_{2}O\to 2Ag+H_{2}O+O_2$
Role of hydrogen peroxide in the above reactions is respectively

1. oxidizing in (I) and reducing in (II)
2. reducing in (I) and oxidizing in (II)
3. reducing in (I) and (II)
4. oxidizing in (I) and (II)

Q. The reaction $H_{2}S+H_2{O}_2\to 2H_{2}O+S$ shows

1. Oxidizing action of $H_2{O}_2$
2. Reducing action of $H_2{O}_2$
3. Alkaline nature of $H_2{O}_2$
4. Acidic nature of $H_2{O}_2$

Q. Which of the following will not be oxidised by $O_3$?
(IIT-JEE, 2005)

1. KI
2. $FeS{O}_4$
3. $KMn{O}_4$
4. $K_{2}Mn{O}_4$

Q. A solution of sulphur dioxide in water reacts with $H_{2}S$precipitating sulphur. Here sulphur dioxide acts as

1. As oxidising agent
2. A reducing agent
3. An acid
4. A catalyst

Q. Which substance acts as a reducing agent in the following reaction
$14H^{+}+C{r}_2{O}_7^{2-}+2C{r}^{3+}+7H_{2}O+3N{i}^{2+}$

1. $Ni$
2. $H_{2}O$
3. $C{r}_2{O}_7^{2-}$
4. $H^{+}$

Q. In the reaction
$HAs{O}_2+S{n}^{2+}\to As+S{n}^4+H_{2}O$, oxidising agent is

1. $S{n}^{2+}$
2. $As$
3. $S{n}^{4+}$
4. $HAs{O}_2$

Q.

Which of the following is not a reducing agent

1. NaNO₂

2. NANO₃

3. HI

4. SnCl₂

Q. Identify the oxidising agent (oxidant) in the reaction below

$P{b}_3{O}_4+8HCl\to 3PbC{l}_2+C{l}_2+4H_{2}O$

1. $P{b}_3{O}_4$
2. $HCl$
3. $H_{2}O$
4. $PbC{l}_2$

Q.

Equation $H_{2}S+H_2{O}_2\to S+2H_{2}O$ represents

1. Acidic nature of H₂O₂

2. Basic nature of H₂O₂

3. Oxidising nature of H₂O₂

4. Reducing nature of H₂O₂

Q. The compound which could not act both as oxidizing as well as reducing agent is

1. 
2. 
3. 
4. 

Q.

In the reaction
$C_2{O}_4^{2-}+Mn{O}_4^{-}+H^{+}⟶M{n}^{2+}+C{O}_2+H_{2}O$ the reductant is

1. 

2. 

3. 

4. 

Q. Which of the following will not be oxidised by $O_3$?
(IIT-JEE, 2005)

1. KI
2. $FeS{O}_4$
3. $KMn{O}_4$
4. $K_{2}Mn{O}_4$