Ion Electron Method

Q. When the following redox reaction
$C{l}_2+O{H}^{-}\to Cl{O}_3^{-}+C{l}^{-}+H_{2}O$
is balanced by ion-electron method , what will be the coefficient of $C{l}_2$ and $O{H}^{-}$ respectively?

1. $3,6$
2. $2,4$
3. $1.2$
4. $5,5$

Q. For a given reaction
$aA+bB⟶cC+dD$
where $a,b,c,d$ are the stoichiometric coefficients of $A,B,C,D$ respectively.
Choose the correct statement(s):

1. $\text{Equivalents of A =Equivalents of B}$
2. $\text{Equivalents of A}=\left(\frac{b}{a}\right)\text{Equivalents of B}$
3. $\text{Equivalents of C =Equivalents of D}$
4. $\text{Equivalents of C}=\left(\frac{d}{c}\right)\text{Equivalents of D}$

Q. Identify the correct balanced redox reaction by using ion-electron method:
$Bi{O}_3^{-}+M{n}^{2+}\to B{i}^{3+}+Mn{O}_4^{-}+H_{2}O$

1. $5Bi{O}_3^{-}+22H^{+}+M{n}^{2+}\to 5B{i}^{3+}+7H_{2}O+Mn{O}_4^{-}$
2. $5Bi{O}_3^{-}+14H^{+}+2M{n}^{2+}\to 5B{i}^{3+}+7H_{2}O+2Mn{O}_4^{-}$
3. $2Bi{O}_3^{-}+4H^{+}+M{n}^{2+}\to 2B{i}^{3+}+2H_{2}O+Mn{O}_4^{-}$
4. $6Bi{O}_3^{-}+12H^{+}+3M{n}^{2+}\to 6B{i}^{3+}+6H_{2}O+3Mn{O}_4^{-}$

Q. $Cl{O}_2+Sb{O}_2^{-}\to Cl{O}_2^{-}+Sb(OH{)}_6^{-}$
The balanced form of the above reaction in basic medium using oxidation number method is:

1. $2Cl{O}_2+Sb{O}_2^{-}+2O{H}^{-}\to 2Cl{O}_2^{-}+Sb(OH{)}_6^{-}+2H_{2}O$
2. $Cl{O}_2+Sb{O}_2^{-}+2H_{2}O+O{H}^{-}\to Cl{O}_2^{-}+Sb(OH{)}_6^{-}$
3. $2Cl{O}_2+Sb{O}_2^{-}+2H_{2}O+2O{H}^{-}\to 2Cl{O}_2^{-}+Sb(OH{)}_6^{-}$
4. $2Cl{O}_2+4Sb{O}_2^{-}+2O{H}^{-}\to Cl{O}_2^{-}+4Sb(OH{)}_6^{-}+3H_{2}O$

Q. Identify the correct balanced redox reaction by using ion-electron method:
$Bi{O}_3^{-}+M{n}^{2+}\to B{i}^{3+}+Mn{O}_4^{-}+H_{2}O$

1. $5Bi{O}_3^{-}+22H^{+}+M{n}^{2+}\to 5B{i}^{3+}+7H_{2}O+Mn{O}_4^{-}$
2. $5Bi{O}_3^{-}+14H^{+}+2M{n}^{2+}\to 5B{i}^{3+}+7H_{2}O+2Mn{O}_4^{-}$
3. $2Bi{O}_3^{-}+4H^{+}+M{n}^{2+}\to 2B{i}^{3+}+2H_{2}O+Mn{O}_4^{-}$
4. $6Bi{O}_3^{-}+12H^{+}+3M{n}^{2+}\to 6B{i}^{3+}+6H_{2}O+3Mn{O}_4^{-}$

Q. Balance the following equation by ion electron method:
$C{r}_2{O}_7^{2-}+C_2{H}_{4}O+H^{+}\to 2C{r}^{3+}+C_2{H}_4{O}_2+H_{2}O$

1. $C{r}_2{O}_7^{2-}+3C_2{H}_{4}O+12H^{+}\to 2C{r}^{3+}+3C_2{H}_4{O}_2+6H_{2}O$
2. $C{r}_2{O}_7^{2-}+3C_2{H}_{4}O+8H^{+}\to 2C{r}^{3+}+3C_2{H}_4{O}_2+4H_{2}O$
3. $C{r}_2{O}_7^{2-}+3C_2{H}_{4}O+4H^{+}\to 2C{r}^{3+}+3C_2{H}_4{O}_2+2H_{2}O$
4. $2C{r}_2{O}_7^{2-}+3C_2{H}_{4}O+8H^{+}\to 4C{r}^{3+}+3C_2{H}_4{O}_2+4H_{2}O$

Q.

In the following reaction,
$xM{n}_2{O}_7⟶yMn{O}_2+z{O}_2$ x, y, and z respectively are:

1. 2, 4, 3

2. 2, 3, 4

3. 4, 3, 2

4. None of these

Q. Balance the following equation :
$PbS+H_2{O}_2\to PbS{O}_4+H_{2}O$

1. $2PbS+4H_2{O}_2\to 2PbS{O}_4+4H_{2}O$
2. $PbS+4H_2{O}_2\to PbS{O}_4+4H_{2}O$
3. $PbS+2H_2{O}_2\to PbS{O}_4+2H_{2}O$
4. $2PbS+2H_2{O}_2\to 2PbS{O}_4+4H_{2}O$

Q. What is the coefficient of oxalate ion in the balanced form of following reaction?
$Mn{O}_4^{-}+C_2{O}_4^{2-}+H^{+}⟶M{n}^{2+}+C{O}_2+H_{2}O$

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

Q.

Which of the following occurs due to redox reaction?

1. Liberation of ${\mathrm{H}}_2$ gas on reaction of metal with dilute acid.

2. Burning of $\mathrm{Mg}$ ribbon in air.

3. Formation of Ferrous sulphide when iron is heated with sulphur.

4. Precipitation reaction.

Q. What would happen when a small quantity of $H_2{O}_2$ is added to a solution of $FeS{O}_4$ ?

Q.

In the standardization of ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$using ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$. The equivalent weight of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$is:

Q. What volume of $O_2\left(g\right)$ measured at 1 atm and 273 K will be formed by the action of 100 ml of 0.5 N of $KMn{O}_4$ on hydrogen peroxide in an acidic solution?
$KMn{O}_4+H_{2}S{O}_4+H_2{O}_2\to K_{2}S{O}_4+MnS{O}_4+O_2+H_{2}O$

1. 0.12 L
2. 0.03 L
3. 0.56 L
4. 1.12 L

Q.

Assume the following reaction is carried out in acidic medium.
$6e^{-}+C{r}_2{O_7}^{2-}⟶2{Cr}^{3+}+7H_{2}O$

How many $H^{+}$ do we need to add to the LHS to balance the H atoms?

1. 10

2. 6

3. 7

4. 14

Q. In the following reaction :
$H_2{O}_2\left(aq\right)+C{l}_2{O}_7\left(aq\right)\to Cl{O}_2^{-}\left(aq\right)+O_2\left(g\right)$
Moles of $O{H}^{-}$ and $H_{2}O$ respectively present in a balanced equation in a basic medium are x and y. Calculate the value of x+y:

Q. Identify the correct balanced redox reaction by using ion-electron method:
$Bi{O}_3^{-}+M{n}^{2+}\to B{i}^{3+}+Mn{O}_4^{-}+H_{2}O$

1. $5Bi{O}_3^{-}+22H^{+}+M{n}^{2+}\to 5B{i}^{3+}+7H_{2}O+Mn{O}_4^{-}$
2. $5Bi{O}_3^{-}+14H^{+}+2M{n}^{2+}\to 5B{i}^{3+}+7H_{2}O+2Mn{O}_4^{-}$
3. $2Bi{O}_3^{-}+4H^{+}+M{n}^{2+}\to 2B{i}^{3+}+2H_{2}O+Mn{O}_4^{-}$
4. $6Bi{O}_3^{-}+12H^{+}+3M{n}^{2+}\to 6B{i}^{3+}+6H_{2}O+3Mn{O}_4^{-}$

Q. Balance the following equation :
$PbS+H_2{O}_2\to PbS{O}_4+H_{2}O$

1. $2PbS+4H_2{O}_2\to 2PbS{O}_4+4H_{2}O$
2. $PbS+4H_2{O}_2\to PbS{O}_4+4H_{2}O$
3. $PbS+2H_2{O}_2\to PbS{O}_4+2H_{2}O$
4. $2PbS+2H_2{O}_2\to 2PbS{O}_4+4H_{2}O$

Q. Identify the correctly balanced redox reaction using ion-electron method.
$FeS{O}_4+KMn{O}_4+H_{2}S{O}_4\to F{e}_2(S{O}_4{)}_3+MnS{O}_4+H_{2}O+K_{2}S{O}_4$

1. $10FeS{O}_4+2KMn{O}_4+8H_{2}S{O}_4\to 5F{e}_2(S{O}_4{)}_3+2MnS{O}_4+8H_{2}O+K_{2}S{O}_4$
2. $2FeS{O}_4+10KMn{O}_4+4H_{2}S{O}_4\to 2F{e}_2(S{O}_4{)}_3+5MnS{O}_4+8H_{2}O+10K_{2}S{O}_4$
3. $8FeS{O}_4+10KMn{O}_4+2H_{2}S{O}_4\to 5F{e}_2(S{O}_4{)}_3+4MnS{O}_4+H_{2}O+2K_{2}S{O}_4$
4. $10FeS{O}_4+8KMn{O}_4+2H_{2}S{O}_4\to 4F{e}_2(S{O}_4{)}_3+2MnS{O}_4+5H_{2}O+K_{2}S{O}_4$

Q. Balance by Ion electon method, $C{r}_2{O}_7^{-2}+F{e}^{+2}\to C{r}^{+3}+H_{2}O$ (in acidic medium).

1. $C{r}_2{O}_7^{-2}+2F{e}^{+2}+14H^{+}\to C{r}^{+3}+2F{e}^{+3}+7H_{2}O$
2. $C{r}_2{O}_7^{-2}+F{e}^{+2}+2H^{+}\to 2C{r}^{+3}+F{e}^{+3}+H_{2}O$
3. $C{r}_2{O}_7^{-2}+3F{e}^{+2}+14H^{+}\to 2C{r}^{+3}+3F{e}^{+3}+H_{2}O$
4. $C{r}_2{O}_7^{-2}+6F{e}^{+2}+14H^{+}\to 2C{r}^{+3}+6F{e}^{+3}+7H_{2}O$

Q.

Balance the equation $\mathrm{NO}+{\mathrm{O}}_2\to {\mathrm{NO}}_2$

Q.

In the following reaction,
$xM{n}_2{O}_7⟶yMn{O}_2+z{O}_2$ x, y, and z respectively are:

1. 2, 4, 3

2. 2, 3, 4

3. 4, 3, 2

4. None of these