Balancing of Redox Reactions
CHXI08:REDOX REACTIONS

315091 Consider the following reaction
\(\rm{5 \mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{ClO}_{2}+2 \mathrm{OH}^{-} \rightarrow x \mathrm{Cl}^{-}+y \mathrm{O}_{2}+6 \mathrm{H}_{2} \mathrm{O}}\)
The reaction is balanced if

1 \(\mathrm{x=4, y=10}\)
2 \(\mathrm{x=5, y=5}\)
3 \(\mathrm{x=5, y=2}\)
4 \(\mathrm{x=2, y=5}\)
CHXI08:REDOX REACTIONS

315092 In the balanced chemical reaction,
\(\mathrm{\mathrm{IO}_{3}^{-}+\mathrm{a} \mathrm{I}^{-}+\mathrm{b} \mathrm{H}^{+} \rightarrow \mathrm{c} \mathrm{H}_{2} \mathrm{O}+\mathrm{d} \mathrm{I}_{2}}\)
a, b, c and d respectively correspond to :

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

315093 In the reaction the stoichiometry coefficients of \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}, \mathrm{NO}_{2}^{-}}\) and \(\mathrm{\mathrm{H}^{+}}\) respectively are \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{NO}_{2}^{-}+\mathrm{H}^{+} \rightarrow \mathrm{Cr}^{3+}+\mathrm{NO}_{3}^{-}+\mathrm{H}_{2} \mathrm{O}}\)

1 \(\mathrm{1,3,8}\)
2 \(\mathrm{1,4,8}\)
3 \(\mathrm{1,3,12}\)
4 \(\mathrm{1,5,12}\)
CHXI08:REDOX REACTIONS

315094 Given \(\mathrm{\mathrm{XNa}_{2} \mathrm{HAsO}_{3}+\mathrm{YNaBrO}_{3}+\mathrm{ZHCl} \rightarrow}\)
\(\rm{\mathrm{NaBr}+\mathrm{H}_{3} \mathrm{AsO}_{4}+\mathrm{NaCl}}\)
The values of \(\mathrm{X, Y}\) and \(\mathrm{Z}\) in the above redox reaction are respectively.

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

315091 Consider the following reaction
\(\rm{5 \mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{ClO}_{2}+2 \mathrm{OH}^{-} \rightarrow x \mathrm{Cl}^{-}+y \mathrm{O}_{2}+6 \mathrm{H}_{2} \mathrm{O}}\)
The reaction is balanced if

1 \(\mathrm{x=4, y=10}\)
2 \(\mathrm{x=5, y=5}\)
3 \(\mathrm{x=5, y=2}\)
4 \(\mathrm{x=2, y=5}\)
CHXI08:REDOX REACTIONS

315092 In the balanced chemical reaction,
\(\mathrm{\mathrm{IO}_{3}^{-}+\mathrm{a} \mathrm{I}^{-}+\mathrm{b} \mathrm{H}^{+} \rightarrow \mathrm{c} \mathrm{H}_{2} \mathrm{O}+\mathrm{d} \mathrm{I}_{2}}\)
a, b, c and d respectively correspond to :

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

315093 In the reaction the stoichiometry coefficients of \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}, \mathrm{NO}_{2}^{-}}\) and \(\mathrm{\mathrm{H}^{+}}\) respectively are \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{NO}_{2}^{-}+\mathrm{H}^{+} \rightarrow \mathrm{Cr}^{3+}+\mathrm{NO}_{3}^{-}+\mathrm{H}_{2} \mathrm{O}}\)

1 \(\mathrm{1,3,8}\)
2 \(\mathrm{1,4,8}\)
3 \(\mathrm{1,3,12}\)
4 \(\mathrm{1,5,12}\)
CHXI08:REDOX REACTIONS

315094 Given \(\mathrm{\mathrm{XNa}_{2} \mathrm{HAsO}_{3}+\mathrm{YNaBrO}_{3}+\mathrm{ZHCl} \rightarrow}\)
\(\rm{\mathrm{NaBr}+\mathrm{H}_{3} \mathrm{AsO}_{4}+\mathrm{NaCl}}\)
The values of \(\mathrm{X, Y}\) and \(\mathrm{Z}\) in the above redox reaction are respectively.

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

315091 Consider the following reaction
\(\rm{5 \mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{ClO}_{2}+2 \mathrm{OH}^{-} \rightarrow x \mathrm{Cl}^{-}+y \mathrm{O}_{2}+6 \mathrm{H}_{2} \mathrm{O}}\)
The reaction is balanced if

1 \(\mathrm{x=4, y=10}\)
2 \(\mathrm{x=5, y=5}\)
3 \(\mathrm{x=5, y=2}\)
4 \(\mathrm{x=2, y=5}\)
CHXI08:REDOX REACTIONS

315092 In the balanced chemical reaction,
\(\mathrm{\mathrm{IO}_{3}^{-}+\mathrm{a} \mathrm{I}^{-}+\mathrm{b} \mathrm{H}^{+} \rightarrow \mathrm{c} \mathrm{H}_{2} \mathrm{O}+\mathrm{d} \mathrm{I}_{2}}\)
a, b, c and d respectively correspond to :

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

315093 In the reaction the stoichiometry coefficients of \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}, \mathrm{NO}_{2}^{-}}\) and \(\mathrm{\mathrm{H}^{+}}\) respectively are \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{NO}_{2}^{-}+\mathrm{H}^{+} \rightarrow \mathrm{Cr}^{3+}+\mathrm{NO}_{3}^{-}+\mathrm{H}_{2} \mathrm{O}}\)

1 \(\mathrm{1,3,8}\)
2 \(\mathrm{1,4,8}\)
3 \(\mathrm{1,3,12}\)
4 \(\mathrm{1,5,12}\)
CHXI08:REDOX REACTIONS

315094 Given \(\mathrm{\mathrm{XNa}_{2} \mathrm{HAsO}_{3}+\mathrm{YNaBrO}_{3}+\mathrm{ZHCl} \rightarrow}\)
\(\rm{\mathrm{NaBr}+\mathrm{H}_{3} \mathrm{AsO}_{4}+\mathrm{NaCl}}\)
The values of \(\mathrm{X, Y}\) and \(\mathrm{Z}\) in the above redox reaction are respectively.

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

315091 Consider the following reaction
\(\rm{5 \mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{ClO}_{2}+2 \mathrm{OH}^{-} \rightarrow x \mathrm{Cl}^{-}+y \mathrm{O}_{2}+6 \mathrm{H}_{2} \mathrm{O}}\)
The reaction is balanced if

1 \(\mathrm{x=4, y=10}\)
2 \(\mathrm{x=5, y=5}\)
3 \(\mathrm{x=5, y=2}\)
4 \(\mathrm{x=2, y=5}\)
CHXI08:REDOX REACTIONS

315092 In the balanced chemical reaction,
\(\mathrm{\mathrm{IO}_{3}^{-}+\mathrm{a} \mathrm{I}^{-}+\mathrm{b} \mathrm{H}^{+} \rightarrow \mathrm{c} \mathrm{H}_{2} \mathrm{O}+\mathrm{d} \mathrm{I}_{2}}\)
a, b, c and d respectively correspond to :

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

315093 In the reaction the stoichiometry coefficients of \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}, \mathrm{NO}_{2}^{-}}\) and \(\mathrm{\mathrm{H}^{+}}\) respectively are \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{NO}_{2}^{-}+\mathrm{H}^{+} \rightarrow \mathrm{Cr}^{3+}+\mathrm{NO}_{3}^{-}+\mathrm{H}_{2} \mathrm{O}}\)

1 \(\mathrm{1,3,8}\)
2 \(\mathrm{1,4,8}\)
3 \(\mathrm{1,3,12}\)
4 \(\mathrm{1,5,12}\)
CHXI08:REDOX REACTIONS

315094 Given \(\mathrm{\mathrm{XNa}_{2} \mathrm{HAsO}_{3}+\mathrm{YNaBrO}_{3}+\mathrm{ZHCl} \rightarrow}\)
\(\rm{\mathrm{NaBr}+\mathrm{H}_{3} \mathrm{AsO}_{4}+\mathrm{NaCl}}\)
The values of \(\mathrm{X, Y}\) and \(\mathrm{Z}\) in the above redox reaction are respectively.

1 \(\mathrm{2,1,2}\)
2 \(\mathrm{2,1,3}\)
3 \(\mathrm{3,1,6}\)
4 \(\mathrm{3,1,4}\)