Balancing of Redox Reactions
CHXI08:REDOX REACTIONS

315098 In the balanced chemical reaction,
\(\mathrm{\mathrm{IO}_{3}^{-}+\mathrm{pI}^{-}+\mathrm{qH}^{+} \rightarrow \mathrm{rH}_{2} \mathrm{O}+\mathrm{sI}_{2}}\)
\(\mathrm{\mathrm{p}, \mathrm{q}, \mathrm{r}}\) and \(\mathrm{\mathrm{s}}\) respectively correspond to

1 \(\mathrm{5,6,4,3}\)
2 \(\mathrm{5,6,3,3}\)
3 \(\mathrm{4,3,5,6}\)
4 \(\mathrm{4,5,6,4}\)
CHXI08:REDOX REACTIONS

315099 When the equation for the reaction of \(\mathrm{Sn}^{2+}(\mathrm{aq})\) and \(\mathrm{MnO}_{4}^{-}(\mathrm{aq})\) is balanced correctly,
\(\_{\rm{S}}{{\rm{n}}^{{\rm{ + 2}}}}({\rm{aq}}) + \_{\rm{MnO}}_4^ - ({\rm{aq}}) + \_{{\rm{H}}^{\rm{ + }}}({\rm{aq}}) \to \)
\(\_{\rm{S}}{{\rm{n}}^{{\rm{4 + }}}}({\rm{aq}}) + \_{\rm{M}}{{\rm{n}}^{{\rm{2 + }}}}({\rm{aq}}) + \_{{\rm{H}}_{\rm{2}}}{\rm{O}}({\rm{l}})\)
what is the ratio of \(\mathrm{Sn}^{2+} / \mathrm{MnO}_{4}^{-}\)?

1 \(\dfrac{2}{1}\)
2 \(\dfrac{5}{2}\)
3 \(\dfrac{1}{1}\)
4 \(\dfrac{1}{2}\)
CHXI08:REDOX REACTIONS

315100 Coefficients of \(\mathrm{S_{2} O_{3}^{2-}}\) and \(\mathrm{I^{-}}\) in the following balanced equation .
\(\rm{\mathrm{I}_{2}+\mathrm{S}_{2} \mathrm{O}_{3}^{2-} \rightarrow \mathrm{I}^{-}+\mathrm{S}_{4} \mathrm{O}_{6}^{2-}}\)

1 1, 2
2 2, 1
3 2, 2
4 1, 1
CHXI08:REDOX REACTIONS

315101 Which of the following equations is a balanced one?

1 \(\mathrm{5 \mathrm{BiO}_{3}^{-}+22 \mathrm{H}^{+}+\mathrm{Mn}^{2+} \rightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}+\mathrm{MnO}_{4}^{-}}\)
2 \(\mathrm{5 \mathrm{BiO}_{3}^{-}+14 \mathrm{H}^{+}+2 \mathrm{Mn}^{2+} \rightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}}\) \(\mathrm{+2 \mathrm{MnO}_{4}^{-}}\)
3 \(\mathrm{2 \mathrm{BiO}_{3}^{-}+4 \mathrm{H}^{+}+\mathrm{Mn}^{2+} \rightarrow 2 \mathrm{Bi}^{3+}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{MnO}_{4}^{-}}\)
4 \(\mathrm{6 \mathrm{BiO}_{3}^{-}+12 \mathrm{H}^{+}+3 \mathrm{Mn}^{2+} \rightarrow 6 \mathrm{Bi}^{3+}+6 \mathrm{H}_{2} \mathrm{O}}\) \(\mathrm{+3 \mathrm{MnO}_{4}^{-}}\)
CHXI08:REDOX REACTIONS

315102 \(2 \mathrm{IO}_{3}^{-}+\mathrm{xI}^{-}+12 \mathrm{H}^{+} \rightarrow 6 \mathrm{I}_{2}+6 \mathrm{H}_{2} \mathrm{O}\)
What is the value of x ?

1 10
2 12
3 2
4 6
CHXI08:REDOX REACTIONS

315098 In the balanced chemical reaction,
\(\mathrm{\mathrm{IO}_{3}^{-}+\mathrm{pI}^{-}+\mathrm{qH}^{+} \rightarrow \mathrm{rH}_{2} \mathrm{O}+\mathrm{sI}_{2}}\)
\(\mathrm{\mathrm{p}, \mathrm{q}, \mathrm{r}}\) and \(\mathrm{\mathrm{s}}\) respectively correspond to

1 \(\mathrm{5,6,4,3}\)
2 \(\mathrm{5,6,3,3}\)
3 \(\mathrm{4,3,5,6}\)
4 \(\mathrm{4,5,6,4}\)
CHXI08:REDOX REACTIONS

315099 When the equation for the reaction of \(\mathrm{Sn}^{2+}(\mathrm{aq})\) and \(\mathrm{MnO}_{4}^{-}(\mathrm{aq})\) is balanced correctly,
\(\_{\rm{S}}{{\rm{n}}^{{\rm{ + 2}}}}({\rm{aq}}) + \_{\rm{MnO}}_4^ - ({\rm{aq}}) + \_{{\rm{H}}^{\rm{ + }}}({\rm{aq}}) \to \)
\(\_{\rm{S}}{{\rm{n}}^{{\rm{4 + }}}}({\rm{aq}}) + \_{\rm{M}}{{\rm{n}}^{{\rm{2 + }}}}({\rm{aq}}) + \_{{\rm{H}}_{\rm{2}}}{\rm{O}}({\rm{l}})\)
what is the ratio of \(\mathrm{Sn}^{2+} / \mathrm{MnO}_{4}^{-}\)?

1 \(\dfrac{2}{1}\)
2 \(\dfrac{5}{2}\)
3 \(\dfrac{1}{1}\)
4 \(\dfrac{1}{2}\)
CHXI08:REDOX REACTIONS

315100 Coefficients of \(\mathrm{S_{2} O_{3}^{2-}}\) and \(\mathrm{I^{-}}\) in the following balanced equation .
\(\rm{\mathrm{I}_{2}+\mathrm{S}_{2} \mathrm{O}_{3}^{2-} \rightarrow \mathrm{I}^{-}+\mathrm{S}_{4} \mathrm{O}_{6}^{2-}}\)

1 1, 2
2 2, 1
3 2, 2
4 1, 1
CHXI08:REDOX REACTIONS

315101 Which of the following equations is a balanced one?

1 \(\mathrm{5 \mathrm{BiO}_{3}^{-}+22 \mathrm{H}^{+}+\mathrm{Mn}^{2+} \rightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}+\mathrm{MnO}_{4}^{-}}\)
2 \(\mathrm{5 \mathrm{BiO}_{3}^{-}+14 \mathrm{H}^{+}+2 \mathrm{Mn}^{2+} \rightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}}\) \(\mathrm{+2 \mathrm{MnO}_{4}^{-}}\)
3 \(\mathrm{2 \mathrm{BiO}_{3}^{-}+4 \mathrm{H}^{+}+\mathrm{Mn}^{2+} \rightarrow 2 \mathrm{Bi}^{3+}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{MnO}_{4}^{-}}\)
4 \(\mathrm{6 \mathrm{BiO}_{3}^{-}+12 \mathrm{H}^{+}+3 \mathrm{Mn}^{2+} \rightarrow 6 \mathrm{Bi}^{3+}+6 \mathrm{H}_{2} \mathrm{O}}\) \(\mathrm{+3 \mathrm{MnO}_{4}^{-}}\)
CHXI08:REDOX REACTIONS

315102 \(2 \mathrm{IO}_{3}^{-}+\mathrm{xI}^{-}+12 \mathrm{H}^{+} \rightarrow 6 \mathrm{I}_{2}+6 \mathrm{H}_{2} \mathrm{O}\)
What is the value of x ?

1 10
2 12
3 2
4 6
CHXI08:REDOX REACTIONS

315098 In the balanced chemical reaction,
\(\mathrm{\mathrm{IO}_{3}^{-}+\mathrm{pI}^{-}+\mathrm{qH}^{+} \rightarrow \mathrm{rH}_{2} \mathrm{O}+\mathrm{sI}_{2}}\)
\(\mathrm{\mathrm{p}, \mathrm{q}, \mathrm{r}}\) and \(\mathrm{\mathrm{s}}\) respectively correspond to

1 \(\mathrm{5,6,4,3}\)
2 \(\mathrm{5,6,3,3}\)
3 \(\mathrm{4,3,5,6}\)
4 \(\mathrm{4,5,6,4}\)
CHXI08:REDOX REACTIONS

315099 When the equation for the reaction of \(\mathrm{Sn}^{2+}(\mathrm{aq})\) and \(\mathrm{MnO}_{4}^{-}(\mathrm{aq})\) is balanced correctly,
\(\_{\rm{S}}{{\rm{n}}^{{\rm{ + 2}}}}({\rm{aq}}) + \_{\rm{MnO}}_4^ - ({\rm{aq}}) + \_{{\rm{H}}^{\rm{ + }}}({\rm{aq}}) \to \)
\(\_{\rm{S}}{{\rm{n}}^{{\rm{4 + }}}}({\rm{aq}}) + \_{\rm{M}}{{\rm{n}}^{{\rm{2 + }}}}({\rm{aq}}) + \_{{\rm{H}}_{\rm{2}}}{\rm{O}}({\rm{l}})\)
what is the ratio of \(\mathrm{Sn}^{2+} / \mathrm{MnO}_{4}^{-}\)?

1 \(\dfrac{2}{1}\)
2 \(\dfrac{5}{2}\)
3 \(\dfrac{1}{1}\)
4 \(\dfrac{1}{2}\)
CHXI08:REDOX REACTIONS

315100 Coefficients of \(\mathrm{S_{2} O_{3}^{2-}}\) and \(\mathrm{I^{-}}\) in the following balanced equation .
\(\rm{\mathrm{I}_{2}+\mathrm{S}_{2} \mathrm{O}_{3}^{2-} \rightarrow \mathrm{I}^{-}+\mathrm{S}_{4} \mathrm{O}_{6}^{2-}}\)

1 1, 2
2 2, 1
3 2, 2
4 1, 1
CHXI08:REDOX REACTIONS

315101 Which of the following equations is a balanced one?

1 \(\mathrm{5 \mathrm{BiO}_{3}^{-}+22 \mathrm{H}^{+}+\mathrm{Mn}^{2+} \rightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}+\mathrm{MnO}_{4}^{-}}\)
2 \(\mathrm{5 \mathrm{BiO}_{3}^{-}+14 \mathrm{H}^{+}+2 \mathrm{Mn}^{2+} \rightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}}\) \(\mathrm{+2 \mathrm{MnO}_{4}^{-}}\)
3 \(\mathrm{2 \mathrm{BiO}_{3}^{-}+4 \mathrm{H}^{+}+\mathrm{Mn}^{2+} \rightarrow 2 \mathrm{Bi}^{3+}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{MnO}_{4}^{-}}\)
4 \(\mathrm{6 \mathrm{BiO}_{3}^{-}+12 \mathrm{H}^{+}+3 \mathrm{Mn}^{2+} \rightarrow 6 \mathrm{Bi}^{3+}+6 \mathrm{H}_{2} \mathrm{O}}\) \(\mathrm{+3 \mathrm{MnO}_{4}^{-}}\)
CHXI08:REDOX REACTIONS

315102 \(2 \mathrm{IO}_{3}^{-}+\mathrm{xI}^{-}+12 \mathrm{H}^{+} \rightarrow 6 \mathrm{I}_{2}+6 \mathrm{H}_{2} \mathrm{O}\)
What is the value of x ?

1 10
2 12
3 2
4 6
CHXI08:REDOX REACTIONS

315098 In the balanced chemical reaction,
\(\mathrm{\mathrm{IO}_{3}^{-}+\mathrm{pI}^{-}+\mathrm{qH}^{+} \rightarrow \mathrm{rH}_{2} \mathrm{O}+\mathrm{sI}_{2}}\)
\(\mathrm{\mathrm{p}, \mathrm{q}, \mathrm{r}}\) and \(\mathrm{\mathrm{s}}\) respectively correspond to

1 \(\mathrm{5,6,4,3}\)
2 \(\mathrm{5,6,3,3}\)
3 \(\mathrm{4,3,5,6}\)
4 \(\mathrm{4,5,6,4}\)
CHXI08:REDOX REACTIONS

315099 When the equation for the reaction of \(\mathrm{Sn}^{2+}(\mathrm{aq})\) and \(\mathrm{MnO}_{4}^{-}(\mathrm{aq})\) is balanced correctly,
\(\_{\rm{S}}{{\rm{n}}^{{\rm{ + 2}}}}({\rm{aq}}) + \_{\rm{MnO}}_4^ - ({\rm{aq}}) + \_{{\rm{H}}^{\rm{ + }}}({\rm{aq}}) \to \)
\(\_{\rm{S}}{{\rm{n}}^{{\rm{4 + }}}}({\rm{aq}}) + \_{\rm{M}}{{\rm{n}}^{{\rm{2 + }}}}({\rm{aq}}) + \_{{\rm{H}}_{\rm{2}}}{\rm{O}}({\rm{l}})\)
what is the ratio of \(\mathrm{Sn}^{2+} / \mathrm{MnO}_{4}^{-}\)?

1 \(\dfrac{2}{1}\)
2 \(\dfrac{5}{2}\)
3 \(\dfrac{1}{1}\)
4 \(\dfrac{1}{2}\)
CHXI08:REDOX REACTIONS

315100 Coefficients of \(\mathrm{S_{2} O_{3}^{2-}}\) and \(\mathrm{I^{-}}\) in the following balanced equation .
\(\rm{\mathrm{I}_{2}+\mathrm{S}_{2} \mathrm{O}_{3}^{2-} \rightarrow \mathrm{I}^{-}+\mathrm{S}_{4} \mathrm{O}_{6}^{2-}}\)

1 1, 2
2 2, 1
3 2, 2
4 1, 1
CHXI08:REDOX REACTIONS

315101 Which of the following equations is a balanced one?

1 \(\mathrm{5 \mathrm{BiO}_{3}^{-}+22 \mathrm{H}^{+}+\mathrm{Mn}^{2+} \rightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}+\mathrm{MnO}_{4}^{-}}\)
2 \(\mathrm{5 \mathrm{BiO}_{3}^{-}+14 \mathrm{H}^{+}+2 \mathrm{Mn}^{2+} \rightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}}\) \(\mathrm{+2 \mathrm{MnO}_{4}^{-}}\)
3 \(\mathrm{2 \mathrm{BiO}_{3}^{-}+4 \mathrm{H}^{+}+\mathrm{Mn}^{2+} \rightarrow 2 \mathrm{Bi}^{3+}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{MnO}_{4}^{-}}\)
4 \(\mathrm{6 \mathrm{BiO}_{3}^{-}+12 \mathrm{H}^{+}+3 \mathrm{Mn}^{2+} \rightarrow 6 \mathrm{Bi}^{3+}+6 \mathrm{H}_{2} \mathrm{O}}\) \(\mathrm{+3 \mathrm{MnO}_{4}^{-}}\)
CHXI08:REDOX REACTIONS

315102 \(2 \mathrm{IO}_{3}^{-}+\mathrm{xI}^{-}+12 \mathrm{H}^{+} \rightarrow 6 \mathrm{I}_{2}+6 \mathrm{H}_{2} \mathrm{O}\)
What is the value of x ?

1 10
2 12
3 2
4 6
CHXI08:REDOX REACTIONS

315098 In the balanced chemical reaction,
\(\mathrm{\mathrm{IO}_{3}^{-}+\mathrm{pI}^{-}+\mathrm{qH}^{+} \rightarrow \mathrm{rH}_{2} \mathrm{O}+\mathrm{sI}_{2}}\)
\(\mathrm{\mathrm{p}, \mathrm{q}, \mathrm{r}}\) and \(\mathrm{\mathrm{s}}\) respectively correspond to

1 \(\mathrm{5,6,4,3}\)
2 \(\mathrm{5,6,3,3}\)
3 \(\mathrm{4,3,5,6}\)
4 \(\mathrm{4,5,6,4}\)
CHXI08:REDOX REACTIONS

315099 When the equation for the reaction of \(\mathrm{Sn}^{2+}(\mathrm{aq})\) and \(\mathrm{MnO}_{4}^{-}(\mathrm{aq})\) is balanced correctly,
\(\_{\rm{S}}{{\rm{n}}^{{\rm{ + 2}}}}({\rm{aq}}) + \_{\rm{MnO}}_4^ - ({\rm{aq}}) + \_{{\rm{H}}^{\rm{ + }}}({\rm{aq}}) \to \)
\(\_{\rm{S}}{{\rm{n}}^{{\rm{4 + }}}}({\rm{aq}}) + \_{\rm{M}}{{\rm{n}}^{{\rm{2 + }}}}({\rm{aq}}) + \_{{\rm{H}}_{\rm{2}}}{\rm{O}}({\rm{l}})\)
what is the ratio of \(\mathrm{Sn}^{2+} / \mathrm{MnO}_{4}^{-}\)?

1 \(\dfrac{2}{1}\)
2 \(\dfrac{5}{2}\)
3 \(\dfrac{1}{1}\)
4 \(\dfrac{1}{2}\)
CHXI08:REDOX REACTIONS

315100 Coefficients of \(\mathrm{S_{2} O_{3}^{2-}}\) and \(\mathrm{I^{-}}\) in the following balanced equation .
\(\rm{\mathrm{I}_{2}+\mathrm{S}_{2} \mathrm{O}_{3}^{2-} \rightarrow \mathrm{I}^{-}+\mathrm{S}_{4} \mathrm{O}_{6}^{2-}}\)

1 1, 2
2 2, 1
3 2, 2
4 1, 1
CHXI08:REDOX REACTIONS

315101 Which of the following equations is a balanced one?

1 \(\mathrm{5 \mathrm{BiO}_{3}^{-}+22 \mathrm{H}^{+}+\mathrm{Mn}^{2+} \rightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}+\mathrm{MnO}_{4}^{-}}\)
2 \(\mathrm{5 \mathrm{BiO}_{3}^{-}+14 \mathrm{H}^{+}+2 \mathrm{Mn}^{2+} \rightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}}\) \(\mathrm{+2 \mathrm{MnO}_{4}^{-}}\)
3 \(\mathrm{2 \mathrm{BiO}_{3}^{-}+4 \mathrm{H}^{+}+\mathrm{Mn}^{2+} \rightarrow 2 \mathrm{Bi}^{3+}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{MnO}_{4}^{-}}\)
4 \(\mathrm{6 \mathrm{BiO}_{3}^{-}+12 \mathrm{H}^{+}+3 \mathrm{Mn}^{2+} \rightarrow 6 \mathrm{Bi}^{3+}+6 \mathrm{H}_{2} \mathrm{O}}\) \(\mathrm{+3 \mathrm{MnO}_{4}^{-}}\)
CHXI08:REDOX REACTIONS

315102 \(2 \mathrm{IO}_{3}^{-}+\mathrm{xI}^{-}+12 \mathrm{H}^{+} \rightarrow 6 \mathrm{I}_{2}+6 \mathrm{H}_{2} \mathrm{O}\)
What is the value of x ?

1 10
2 12
3 2
4 6