Oxidising Reagent and Reducing Reagent

Q.

How do you balance the equation$\mathrm{Al}\left(\mathrm{s}\right)+\mathrm{HCl}\left(\mathrm{l}\right)\to {\mathrm{AlCl}}_3\left(\mathrm{s}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$?

Q.

Why is potassium dichromate a good oxidizing agent?

Q.

Is ${\mathrm{Ag}}_2\mathrm{O}$ a mild oxidizing agent?

Q.

Which of the following is the strongest oxidising agent

1. $Br{O}_3^{-}/B{r}^{2+},E^0=+1.50$

2. $F{e}^{3+}/F{e}^{2+},E^0=+0.76$

3. $Mn{O}_4^{-}/M{n}^{2+},E^0=+1.52$

4. $C{r}_2{O}_7^{2-}/C{r}^{3+},E^0=+1.33$

Q. Which of the following chemical reactions depicts the oxidising behaviour of $H_{2}S{O}_4$?

1. $2HI+H_{2}S{O}_4\to I_2+S{O}_2+2H_{2}O$
2. $Ca(OH{)}_2+H_{2}S{O}_4\to CaS{O}_4+2H_{2}O$
3. $NaHS{O}_4+HCl\to NaCl+H_{2}S{O}_4$
4. $2PC{l}_5+H_{2}S{O}_4\to 2POC{l}_3+2HCl+S{O}_{2}C{l}_2$

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

Q. A $2.18g$ sample contains a mixture of $XO$ and $X_2{O}_3.$ It reacts with 0.015 moles of $K_{2}C{r}_2{O}_7$ to oxidize the sample completely to form $X{O}_4^{-}$ and $C{r}^{3+}$. If 0.0187 moles of $X{O}_4^{-}$ are formed, what is the atomic mass of X?

1. $9.08$
2. $99.08$
3. $54.0$
4. $32.0$

Q.

The substance which gives hydrogen for reduction is called a ________ agent.

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. What is `A' in the following reaction $2F{e}^{3+}\left(aq\right)+S{n}^{2+}\left(aq\right)\to 2F{e}^{2+}\left(aq\right)+A$

1. $S{n}^{3+}\left(aq\right)$
2. $S{n}^{4+}\left(aq\right)$
3. $S{n}^{2+}\left(aq\right)$
4. $Sn$

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

1. Oxidising agent

2. Reducing agent

3. (a) and (b) both

4. None of these

Q. $H_2{O}_2$ reduces $Mn{O}_4^{-}$ ion to

1. $M{n}^{+}$
2. $M{n}^{2+}$
3. $M{n}^{3+}$
4. $M{n}^{-}$

Q.

In the formation of magnesium chloride (by direct combination between magnesium and chlorine), name the substance that is oxidised and the substance that is reduced.

Q. A $3.4\text{g}$ sample of $H_2{O}_2$ solution that has $x\%H_2{O}_2$ by mass requires $x\text{mL}$ of $KMn{O}_4$ solution for complete oxidation under acidic conditions. The molarity of the $KMn{O}_4$ solution is :

1. 1
2. 0.5
3. 0.4
4. 0.2

Q. Identify the oxidant and the reductant in the following reaction respectively:
$3N{a}_{2}HAs{O}_3+KBr{O}_3+6HCl\to 6NaCl+KBr+3H_{3}As{O}_4$

1. $N{a}_{2}HAs{O}_3$ $\&$ $KBr{O}_3$
2. $KBr{O}_3$ $\&$ $N{a}_{2}HAs{O}_3$
3. $HCl$ $\&$ $KBr$
4. $KBr$ $\&$ $HCl$

Q. In the following reactions, identify the oxidising agent and the reducing agent.
$4HCl+Mn{O}_2\to MnC{l}_2+2H_{2}O+C{l}_2$

1. $Mn{O}_2\text{acts an reducing agent}HCl\text{acts as an oxidising agent}$
2. $Mn{O}_2$ acts as both reducing as well oxidising agent
3. $Mn{O}_2\text{acts as an oxidising agent while}HCl\text{acts as an reducing agent}$
4. $\text{None of the above}$

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. Consider the following list of reagents:
$\text{Acidified}{K}_{2}C{r}_2{O}_7,\text{Alkanline}KMn{O}_4,CuS{O}_4,H_2{O}_2,C{l}_2,O_3,FeC{l}_3,HN{O}_3,andN{a}_2{S}_2{O}_3$
Which of the following reagents can oxidise aqueous iodide to iodine

1. $\text{Acidified}{K}_{2}C{r}_2{O}_7$
2. $N{a}_2{S}_2{O}_3$
3. $C{l}_2$
4. $O_3$

Q. Which of the following statements is not correct for a galvanic cell ?

Q.

Among statements I - IV, the correct ones are:

I. Decomposition of hydrogen peroxide gives dioxygen

II. Like hydrogen peroxide, compounds, such as KClO₃, Pb(NO₃)₂ and NaNO₃ when heated liberate dioxygen.

III. $2-\mathrm{Ethylanthraquinone}$ is useful for the industrial preparation of hydrogen peroxide.

IV. Hydrogen peroxide is used for the manufacture of sodium perborate

1. I, II, III and IV

2. I, II and III only

3. I, III and IV only

4. I and III only

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

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

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

4. $H^{+}$

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

1. $S{O}_2$
2. $Mn{O}_2$
3. $A{l}_2{O}_3$
4. $CrO$

Q. In the following reactions, identify the oxidising agent and the reducing agent.
$4HCl+Mn{O}_2\to MnC{l}_2+2H_{2}O+C{l}_2$

1. $Mn{O}_2\text{acts an reducing agent}HCl\text{acts as an oxidising agent}$
2. $Mn{O}_2$ acts as both reducing as well oxidising agent
3. $Mn{O}_2\text{acts as an oxidising agent while}HCl\text{acts as an reducing agent}$
4. $\text{None of the above}$

Q. From the following statements regarding $H_2{O}_2$ choose the incorrect statement.

1. It can act only as an oxidixing agent
2. It decomposed on exposure to light
3. It has to be stored in plastic or wax lined glass bottles in dark
4. It has to be kept away from dust

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. In the following reaction,
$3B{r}_2+6C{O}_3^{2-}+3H_{2}O\to 5B{r}^{-}+Br{O}_3^{-}+6HC{O}_3^{-}$

1. Bromine is oxidised, carbonate is reduced
2. Bromine is reduced, carbonate is oxidised
3. Bromine is neither reduced nor oxidised
4. Bromine is reduced as well as oxidised

Q. Given that $E_{O_2/H_{2}O}^o=+1.23V$; $E_{S_2{O}_8^{2-}/S{O}_4^{2-}}^o=+2.05V$; $E_{B{r}_2/B{r}^{-}}^o=+1.09V$; $E_{A{u}^{3+}/Au}^o=+1.4V$. The strongest oxidizing agent is:

1. $O_2$
2. $S_2{O}_8^{2-}$
3. $A{u}^{3+}$
4. $B{r}_2$

Q.

The reaction $H_{2}S+H_2{O}_2⟶2H_{2}O+S$ shows

1. Oxidizing action of $H_{2}S$

2. Reducing action of $H_{2}S$

3. Alkaline nature of $H_{2}S$

4. Acidic nature of $H_{2}S$

Q. is the reducing agent in the reaction $ZnO\left(s\right)+C\left(s\right)⟶Zn\left(s\right)+CO\left(g\right)$

1. Zn
2. C
3. CO

Q. Identify the oxidant and the reductant in the following reaction respectively:
$I_2+N{a}_2{S}_2{O}_3\to N{a}_2{S}_4{O}_6+NaI$

1. $I_2$ $\&$ $N{a}_2{S}_2{O}_3$
2. $N{a}_2{S}_2{O}_3$ $\&$ $I_2$
3. $I_2$ $\&$ $NaI$
4. $NaI$ $\&$ $I_2$