Oxidation Number
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CHXI08:REDOX REACTIONS

315177 The oxidation state of the most electronegative element in the products of the reaction between \(\mathrm{\mathrm{BaO}_{2}}\) and \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\) are

1 \({\rm{0}}\,\,{\rm{and}}\,\,{\rm{ - 1}}\)
2 \({\rm{ - 1}}\,\,{\rm{and}}\,\,{\rm{ - 2}}\)
3 \({\rm{ - 2}}\,\,{\rm{and}}\,\,{\rm{0}}\)
4 \({\rm{ - 2}}\,\,{\rm{and}}\,\,{\rm{ + 1}}\)
CHXI08:REDOX REACTIONS

315178 In which of the following compounds, iron has an oxidation number of +3 ?

1 None of these
2 \(\mathrm{\mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{2}}\)
3 \(\mathrm{\mathrm{FeC}_{2} \mathrm{O}_{4}}\)
4 \(\mathrm{\mathrm{FeCl}_{3}}\)
CHXI08:REDOX REACTIONS

315179 The oxidation states of sulphur in the anions
\(\mathrm{SO}_{3}^{2-}, \mathrm{S}_{2} \mathrm{O}_{4}^{2-}\) and \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-}\) follow the order.

1 \(\mathrm{SO}_{3}^{2-} < \mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{S}_{2} \mathrm{O}_{6}^{2-}\)
2 \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{S}_{2} \mathrm{O}_{6}^{2-} < \mathrm{SO}_{3}^{2-}\)
3 \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-} < \mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{SO}_{3}^{2-}\)
4 \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{SO}_{3}^{2-} < \mathrm{S}_{2} \mathrm{O}_{6}^{2-}\)
CHXI08:REDOX REACTIONS

315180 In which of the following reactions, there is no change in oxidation state?

1 \(\mathrm{4 \mathrm{KClO}_{3} \rightarrow 3 \mathrm{KClO}_{4}+\mathrm{KCl}}\)
2 \(\mathrm{\mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{~S} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}+3 \mathrm{~S}}\)
3 \(\mathrm{\mathrm{BaO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{BaSO}_{4}+\mathrm{H}_{2} \mathrm{O}_{2}}\)
4 \(\mathrm{2 \mathrm{BaO}+\mathrm{O}_{2} \rightarrow 2 \mathrm{BaO}_{2}}\)
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CHXI08:REDOX REACTIONS

315177 The oxidation state of the most electronegative element in the products of the reaction between \(\mathrm{\mathrm{BaO}_{2}}\) and \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\) are

1 \({\rm{0}}\,\,{\rm{and}}\,\,{\rm{ - 1}}\)
2 \({\rm{ - 1}}\,\,{\rm{and}}\,\,{\rm{ - 2}}\)
3 \({\rm{ - 2}}\,\,{\rm{and}}\,\,{\rm{0}}\)
4 \({\rm{ - 2}}\,\,{\rm{and}}\,\,{\rm{ + 1}}\)
CHXI08:REDOX REACTIONS

315178 In which of the following compounds, iron has an oxidation number of +3 ?

1 None of these
2 \(\mathrm{\mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{2}}\)
3 \(\mathrm{\mathrm{FeC}_{2} \mathrm{O}_{4}}\)
4 \(\mathrm{\mathrm{FeCl}_{3}}\)
CHXI08:REDOX REACTIONS

315179 The oxidation states of sulphur in the anions
\(\mathrm{SO}_{3}^{2-}, \mathrm{S}_{2} \mathrm{O}_{4}^{2-}\) and \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-}\) follow the order.

1 \(\mathrm{SO}_{3}^{2-} < \mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{S}_{2} \mathrm{O}_{6}^{2-}\)
2 \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{S}_{2} \mathrm{O}_{6}^{2-} < \mathrm{SO}_{3}^{2-}\)
3 \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-} < \mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{SO}_{3}^{2-}\)
4 \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{SO}_{3}^{2-} < \mathrm{S}_{2} \mathrm{O}_{6}^{2-}\)
CHXI08:REDOX REACTIONS

315180 In which of the following reactions, there is no change in oxidation state?

1 \(\mathrm{4 \mathrm{KClO}_{3} \rightarrow 3 \mathrm{KClO}_{4}+\mathrm{KCl}}\)
2 \(\mathrm{\mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{~S} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}+3 \mathrm{~S}}\)
3 \(\mathrm{\mathrm{BaO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{BaSO}_{4}+\mathrm{H}_{2} \mathrm{O}_{2}}\)
4 \(\mathrm{2 \mathrm{BaO}+\mathrm{O}_{2} \rightarrow 2 \mathrm{BaO}_{2}}\)
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CHXI08:REDOX REACTIONS

315177 The oxidation state of the most electronegative element in the products of the reaction between \(\mathrm{\mathrm{BaO}_{2}}\) and \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\) are

1 \({\rm{0}}\,\,{\rm{and}}\,\,{\rm{ - 1}}\)
2 \({\rm{ - 1}}\,\,{\rm{and}}\,\,{\rm{ - 2}}\)
3 \({\rm{ - 2}}\,\,{\rm{and}}\,\,{\rm{0}}\)
4 \({\rm{ - 2}}\,\,{\rm{and}}\,\,{\rm{ + 1}}\)
CHXI08:REDOX REACTIONS

315178 In which of the following compounds, iron has an oxidation number of +3 ?

1 None of these
2 \(\mathrm{\mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{2}}\)
3 \(\mathrm{\mathrm{FeC}_{2} \mathrm{O}_{4}}\)
4 \(\mathrm{\mathrm{FeCl}_{3}}\)
CHXI08:REDOX REACTIONS

315179 The oxidation states of sulphur in the anions
\(\mathrm{SO}_{3}^{2-}, \mathrm{S}_{2} \mathrm{O}_{4}^{2-}\) and \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-}\) follow the order.

1 \(\mathrm{SO}_{3}^{2-} < \mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{S}_{2} \mathrm{O}_{6}^{2-}\)
2 \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{S}_{2} \mathrm{O}_{6}^{2-} < \mathrm{SO}_{3}^{2-}\)
3 \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-} < \mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{SO}_{3}^{2-}\)
4 \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{SO}_{3}^{2-} < \mathrm{S}_{2} \mathrm{O}_{6}^{2-}\)
CHXI08:REDOX REACTIONS

315180 In which of the following reactions, there is no change in oxidation state?

1 \(\mathrm{4 \mathrm{KClO}_{3} \rightarrow 3 \mathrm{KClO}_{4}+\mathrm{KCl}}\)
2 \(\mathrm{\mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{~S} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}+3 \mathrm{~S}}\)
3 \(\mathrm{\mathrm{BaO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{BaSO}_{4}+\mathrm{H}_{2} \mathrm{O}_{2}}\)
4 \(\mathrm{2 \mathrm{BaO}+\mathrm{O}_{2} \rightarrow 2 \mathrm{BaO}_{2}}\)
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CHXI08:REDOX REACTIONS

315177 The oxidation state of the most electronegative element in the products of the reaction between \(\mathrm{\mathrm{BaO}_{2}}\) and \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\) are

1 \({\rm{0}}\,\,{\rm{and}}\,\,{\rm{ - 1}}\)
2 \({\rm{ - 1}}\,\,{\rm{and}}\,\,{\rm{ - 2}}\)
3 \({\rm{ - 2}}\,\,{\rm{and}}\,\,{\rm{0}}\)
4 \({\rm{ - 2}}\,\,{\rm{and}}\,\,{\rm{ + 1}}\)
CHXI08:REDOX REACTIONS

315178 In which of the following compounds, iron has an oxidation number of +3 ?

1 None of these
2 \(\mathrm{\mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{2}}\)
3 \(\mathrm{\mathrm{FeC}_{2} \mathrm{O}_{4}}\)
4 \(\mathrm{\mathrm{FeCl}_{3}}\)
CHXI08:REDOX REACTIONS

315179 The oxidation states of sulphur in the anions
\(\mathrm{SO}_{3}^{2-}, \mathrm{S}_{2} \mathrm{O}_{4}^{2-}\) and \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-}\) follow the order.

1 \(\mathrm{SO}_{3}^{2-} < \mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{S}_{2} \mathrm{O}_{6}^{2-}\)
2 \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{S}_{2} \mathrm{O}_{6}^{2-} < \mathrm{SO}_{3}^{2-}\)
3 \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-} < \mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{SO}_{3}^{2-}\)
4 \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-} < \mathrm{SO}_{3}^{2-} < \mathrm{S}_{2} \mathrm{O}_{6}^{2-}\)
CHXI08:REDOX REACTIONS

315180 In which of the following reactions, there is no change in oxidation state?

1 \(\mathrm{4 \mathrm{KClO}_{3} \rightarrow 3 \mathrm{KClO}_{4}+\mathrm{KCl}}\)
2 \(\mathrm{\mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{~S} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}+3 \mathrm{~S}}\)
3 \(\mathrm{\mathrm{BaO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{BaSO}_{4}+\mathrm{H}_{2} \mathrm{O}_{2}}\)
4 \(\mathrm{2 \mathrm{BaO}+\mathrm{O}_{2} \rightarrow 2 \mathrm{BaO}_{2}}\)