Oxidation Number
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CHXI08:REDOX REACTIONS

315203 Oxidation number of \(\mathrm{\mathrm{S}}\) in \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{5}}\) is 6 . This is observed because-

1 There are five oxygen atoms in the molecule
2 The hydrogen atom is directly linked with non-metal
3 There is peroxide linkage in the molecule
4 The sulphur atom shows co-ordinate linkage
CHXI08:REDOX REACTIONS

315204 Oxidation no. of \(\mathrm{\mathrm{P}}\) in \(\mathrm{\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}, \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}}\), and \(\mathrm{\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}}\) are respectively

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

315205 Identify the compound, in which phosphorus exists in the oxidation state of +1

1 Phosphoric acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{3}\right)}\)
2 Phosphinic acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{2}\right)}\)
3 Pryophosphorus acid \(\mathrm{\left(\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}\right)}\)
4 Orthophosphoric acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{4}\right)}\)
MHTCET - 2017
CHXI08:REDOX REACTIONS

315206 What is the oxidation number of \(\mathrm{\mathrm{Mn}}\) in \({\rm{MnO}}_{\rm{4}}^{{\rm{2 - }}}\)

1 \({\rm{ + 6}}\)
2 \({\rm{ + 8}}\)
3 \({\rm{ - 8}}\)
4 \({\rm{ - 6}}\)
MHTCET - 2020
CHXI08:REDOX REACTIONS

315207 The reaction does not involve change in oxidation state is

1 \(\mathrm{\mathrm{VO}^{2+} \rightarrow \mathrm{V}_{2} \mathrm{O}_{3}}\)
2 \({\rm{Na}} \to {\rm{N}}{{\rm{a}}^ + }\)
3 \(\mathrm{\mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\)
4 \(\mathrm{\mathrm{Zn}^{2+} \rightarrow \mathrm{Zn}}\)
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CHXI08:REDOX REACTIONS

315203 Oxidation number of \(\mathrm{\mathrm{S}}\) in \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{5}}\) is 6 . This is observed because-

1 There are five oxygen atoms in the molecule
2 The hydrogen atom is directly linked with non-metal
3 There is peroxide linkage in the molecule
4 The sulphur atom shows co-ordinate linkage
CHXI08:REDOX REACTIONS

315204 Oxidation no. of \(\mathrm{\mathrm{P}}\) in \(\mathrm{\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}, \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}}\), and \(\mathrm{\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}}\) are respectively

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

315205 Identify the compound, in which phosphorus exists in the oxidation state of +1

1 Phosphoric acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{3}\right)}\)
2 Phosphinic acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{2}\right)}\)
3 Pryophosphorus acid \(\mathrm{\left(\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}\right)}\)
4 Orthophosphoric acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{4}\right)}\)
MHTCET - 2017
CHXI08:REDOX REACTIONS

315206 What is the oxidation number of \(\mathrm{\mathrm{Mn}}\) in \({\rm{MnO}}_{\rm{4}}^{{\rm{2 - }}}\)

1 \({\rm{ + 6}}\)
2 \({\rm{ + 8}}\)
3 \({\rm{ - 8}}\)
4 \({\rm{ - 6}}\)
MHTCET - 2020
CHXI08:REDOX REACTIONS

315207 The reaction does not involve change in oxidation state is

1 \(\mathrm{\mathrm{VO}^{2+} \rightarrow \mathrm{V}_{2} \mathrm{O}_{3}}\)
2 \({\rm{Na}} \to {\rm{N}}{{\rm{a}}^ + }\)
3 \(\mathrm{\mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\)
4 \(\mathrm{\mathrm{Zn}^{2+} \rightarrow \mathrm{Zn}}\)
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CHXI08:REDOX REACTIONS

315203 Oxidation number of \(\mathrm{\mathrm{S}}\) in \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{5}}\) is 6 . This is observed because-

1 There are five oxygen atoms in the molecule
2 The hydrogen atom is directly linked with non-metal
3 There is peroxide linkage in the molecule
4 The sulphur atom shows co-ordinate linkage
CHXI08:REDOX REACTIONS

315204 Oxidation no. of \(\mathrm{\mathrm{P}}\) in \(\mathrm{\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}, \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}}\), and \(\mathrm{\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}}\) are respectively

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

315205 Identify the compound, in which phosphorus exists in the oxidation state of +1

1 Phosphoric acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{3}\right)}\)
2 Phosphinic acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{2}\right)}\)
3 Pryophosphorus acid \(\mathrm{\left(\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}\right)}\)
4 Orthophosphoric acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{4}\right)}\)
MHTCET - 2017
CHXI08:REDOX REACTIONS

315206 What is the oxidation number of \(\mathrm{\mathrm{Mn}}\) in \({\rm{MnO}}_{\rm{4}}^{{\rm{2 - }}}\)

1 \({\rm{ + 6}}\)
2 \({\rm{ + 8}}\)
3 \({\rm{ - 8}}\)
4 \({\rm{ - 6}}\)
MHTCET - 2020
CHXI08:REDOX REACTIONS

315207 The reaction does not involve change in oxidation state is

1 \(\mathrm{\mathrm{VO}^{2+} \rightarrow \mathrm{V}_{2} \mathrm{O}_{3}}\)
2 \({\rm{Na}} \to {\rm{N}}{{\rm{a}}^ + }\)
3 \(\mathrm{\mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\)
4 \(\mathrm{\mathrm{Zn}^{2+} \rightarrow \mathrm{Zn}}\)
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CHXI08:REDOX REACTIONS

315203 Oxidation number of \(\mathrm{\mathrm{S}}\) in \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{5}}\) is 6 . This is observed because-

1 There are five oxygen atoms in the molecule
2 The hydrogen atom is directly linked with non-metal
3 There is peroxide linkage in the molecule
4 The sulphur atom shows co-ordinate linkage
CHXI08:REDOX REACTIONS

315204 Oxidation no. of \(\mathrm{\mathrm{P}}\) in \(\mathrm{\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}, \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}}\), and \(\mathrm{\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}}\) are respectively

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

315205 Identify the compound, in which phosphorus exists in the oxidation state of +1

1 Phosphoric acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{3}\right)}\)
2 Phosphinic acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{2}\right)}\)
3 Pryophosphorus acid \(\mathrm{\left(\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}\right)}\)
4 Orthophosphoric acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{4}\right)}\)
MHTCET - 2017
CHXI08:REDOX REACTIONS

315206 What is the oxidation number of \(\mathrm{\mathrm{Mn}}\) in \({\rm{MnO}}_{\rm{4}}^{{\rm{2 - }}}\)

1 \({\rm{ + 6}}\)
2 \({\rm{ + 8}}\)
3 \({\rm{ - 8}}\)
4 \({\rm{ - 6}}\)
MHTCET - 2020
CHXI08:REDOX REACTIONS

315207 The reaction does not involve change in oxidation state is

1 \(\mathrm{\mathrm{VO}^{2+} \rightarrow \mathrm{V}_{2} \mathrm{O}_{3}}\)
2 \({\rm{Na}} \to {\rm{N}}{{\rm{a}}^ + }\)
3 \(\mathrm{\mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\)
4 \(\mathrm{\mathrm{Zn}^{2+} \rightarrow \mathrm{Zn}}\)
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CHXI08:REDOX REACTIONS

315203 Oxidation number of \(\mathrm{\mathrm{S}}\) in \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{5}}\) is 6 . This is observed because-

1 There are five oxygen atoms in the molecule
2 The hydrogen atom is directly linked with non-metal
3 There is peroxide linkage in the molecule
4 The sulphur atom shows co-ordinate linkage
CHXI08:REDOX REACTIONS

315204 Oxidation no. of \(\mathrm{\mathrm{P}}\) in \(\mathrm{\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}, \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}}\), and \(\mathrm{\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}}\) are respectively

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

315205 Identify the compound, in which phosphorus exists in the oxidation state of +1

1 Phosphoric acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{3}\right)}\)
2 Phosphinic acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{2}\right)}\)
3 Pryophosphorus acid \(\mathrm{\left(\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}\right)}\)
4 Orthophosphoric acid \(\mathrm{\left(\mathrm{H}_{3} \mathrm{PO}_{4}\right)}\)
MHTCET - 2017
CHXI08:REDOX REACTIONS

315206 What is the oxidation number of \(\mathrm{\mathrm{Mn}}\) in \({\rm{MnO}}_{\rm{4}}^{{\rm{2 - }}}\)

1 \({\rm{ + 6}}\)
2 \({\rm{ + 8}}\)
3 \({\rm{ - 8}}\)
4 \({\rm{ - 6}}\)
MHTCET - 2020
CHXI08:REDOX REACTIONS

315207 The reaction does not involve change in oxidation state is

1 \(\mathrm{\mathrm{VO}^{2+} \rightarrow \mathrm{V}_{2} \mathrm{O}_{3}}\)
2 \({\rm{Na}} \to {\rm{N}}{{\rm{a}}^ + }\)
3 \(\mathrm{\mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\)
4 \(\mathrm{\mathrm{Zn}^{2+} \rightarrow \mathrm{Zn}}\)