Oxidation Number
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CHXI08:REDOX REACTIONS

315221 Which of the following conversions involves gain of 5 electrons per ion?

1 \(\mathrm{MnO}_{4}^{-} \rightarrow \mathrm{Mn}^{2+}\)
2 \(\mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{Cr}^{3+}\)
3 \(\mathrm{MnO}_{4}^{2-} \rightarrow \mathrm{MnO}_{2}\)
4 \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \rightarrow 2 \mathrm{Cr}^{3+}\)
CHXI08:REDOX REACTIONS

315222 The oxidation state of iodine in \(\mathrm{\mathrm{H}_{4} \mathrm{IO}_{6}}\) is

1 \({\rm{ + 7}}\)
2 \({\rm{ - 1}}\)
3 \({\rm{ + 5}}\)
4 \({\rm{ + 1}}\)
CHXI08:REDOX REACTIONS

315223 In how many of the following, chlorine has positive oxidation number?
\({\mathrm{\mathrm{HCl}, \mathrm{Cl}_{2} \mathrm{O}, \mathrm{KCl}, \mathrm{HOCl}, \mathrm{Cl}_{2}, \mathrm{MgCl}_{2}, \mathrm{ClO}_{4}^{-}, \mathrm{ClO}_{2}}}\).

1 2
2 3
3 5
4 4
CHXI08:REDOX REACTIONS

315225 Of the following reactions, the one in which oxidation number of ' \(\mathrm{\mathrm{N}}\) ' does not change is

1 \(\mathrm{2 \mathrm{NO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{HNO}_{3}+\mathrm{HNO}_{2}}\)
2 \(\mathrm{\mathrm{N}_{2}+\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}}\)
3 \(\mathrm{2 \mathrm{NO}_{2} \rightarrow \mathrm{N}_{2} \mathrm{O}_{4}}\)
4 \(\mathrm{\mathrm{NH}_{4} \mathrm{NO}_{2} \rightarrow \mathrm{N}_{2}+2 \mathrm{H}_{2} \mathrm{O}}\)
CHXI08:REDOX REACTIONS

315226 Of the following electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

1 \(\mathrm{(\mathrm{n}-1) \mathrm{d}^{8} \mathrm{~ns}^{2}}\)
2 \(\mathrm{(n-1) d^{5} n s^{2}}\)
3 \(\mathrm{(n-1) d^{3} n s^{2}}\)
4 \(\mathrm{(n-1) d^{5} n s^{1}}\)
NEET DIGITAL LIBRARY
CHXI08:REDOX REACTIONS

315221 Which of the following conversions involves gain of 5 electrons per ion?

1 \(\mathrm{MnO}_{4}^{-} \rightarrow \mathrm{Mn}^{2+}\)
2 \(\mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{Cr}^{3+}\)
3 \(\mathrm{MnO}_{4}^{2-} \rightarrow \mathrm{MnO}_{2}\)
4 \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \rightarrow 2 \mathrm{Cr}^{3+}\)
CHXI08:REDOX REACTIONS

315222 The oxidation state of iodine in \(\mathrm{\mathrm{H}_{4} \mathrm{IO}_{6}}\) is

1 \({\rm{ + 7}}\)
2 \({\rm{ - 1}}\)
3 \({\rm{ + 5}}\)
4 \({\rm{ + 1}}\)
CHXI08:REDOX REACTIONS

315223 In how many of the following, chlorine has positive oxidation number?
\({\mathrm{\mathrm{HCl}, \mathrm{Cl}_{2} \mathrm{O}, \mathrm{KCl}, \mathrm{HOCl}, \mathrm{Cl}_{2}, \mathrm{MgCl}_{2}, \mathrm{ClO}_{4}^{-}, \mathrm{ClO}_{2}}}\).

1 2
2 3
3 5
4 4
CHXI08:REDOX REACTIONS

315225 Of the following reactions, the one in which oxidation number of ' \(\mathrm{\mathrm{N}}\) ' does not change is

1 \(\mathrm{2 \mathrm{NO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{HNO}_{3}+\mathrm{HNO}_{2}}\)
2 \(\mathrm{\mathrm{N}_{2}+\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}}\)
3 \(\mathrm{2 \mathrm{NO}_{2} \rightarrow \mathrm{N}_{2} \mathrm{O}_{4}}\)
4 \(\mathrm{\mathrm{NH}_{4} \mathrm{NO}_{2} \rightarrow \mathrm{N}_{2}+2 \mathrm{H}_{2} \mathrm{O}}\)
CHXI08:REDOX REACTIONS

315226 Of the following electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

1 \(\mathrm{(\mathrm{n}-1) \mathrm{d}^{8} \mathrm{~ns}^{2}}\)
2 \(\mathrm{(n-1) d^{5} n s^{2}}\)
3 \(\mathrm{(n-1) d^{3} n s^{2}}\)
4 \(\mathrm{(n-1) d^{5} n s^{1}}\)
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CHXI08:REDOX REACTIONS

315221 Which of the following conversions involves gain of 5 electrons per ion?

1 \(\mathrm{MnO}_{4}^{-} \rightarrow \mathrm{Mn}^{2+}\)
2 \(\mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{Cr}^{3+}\)
3 \(\mathrm{MnO}_{4}^{2-} \rightarrow \mathrm{MnO}_{2}\)
4 \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \rightarrow 2 \mathrm{Cr}^{3+}\)
CHXI08:REDOX REACTIONS

315222 The oxidation state of iodine in \(\mathrm{\mathrm{H}_{4} \mathrm{IO}_{6}}\) is

1 \({\rm{ + 7}}\)
2 \({\rm{ - 1}}\)
3 \({\rm{ + 5}}\)
4 \({\rm{ + 1}}\)
CHXI08:REDOX REACTIONS

315223 In how many of the following, chlorine has positive oxidation number?
\({\mathrm{\mathrm{HCl}, \mathrm{Cl}_{2} \mathrm{O}, \mathrm{KCl}, \mathrm{HOCl}, \mathrm{Cl}_{2}, \mathrm{MgCl}_{2}, \mathrm{ClO}_{4}^{-}, \mathrm{ClO}_{2}}}\).

1 2
2 3
3 5
4 4
CHXI08:REDOX REACTIONS

315225 Of the following reactions, the one in which oxidation number of ' \(\mathrm{\mathrm{N}}\) ' does not change is

1 \(\mathrm{2 \mathrm{NO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{HNO}_{3}+\mathrm{HNO}_{2}}\)
2 \(\mathrm{\mathrm{N}_{2}+\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}}\)
3 \(\mathrm{2 \mathrm{NO}_{2} \rightarrow \mathrm{N}_{2} \mathrm{O}_{4}}\)
4 \(\mathrm{\mathrm{NH}_{4} \mathrm{NO}_{2} \rightarrow \mathrm{N}_{2}+2 \mathrm{H}_{2} \mathrm{O}}\)
CHXI08:REDOX REACTIONS

315226 Of the following electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

1 \(\mathrm{(\mathrm{n}-1) \mathrm{d}^{8} \mathrm{~ns}^{2}}\)
2 \(\mathrm{(n-1) d^{5} n s^{2}}\)
3 \(\mathrm{(n-1) d^{3} n s^{2}}\)
4 \(\mathrm{(n-1) d^{5} n s^{1}}\)
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CHXI08:REDOX REACTIONS

315221 Which of the following conversions involves gain of 5 electrons per ion?

1 \(\mathrm{MnO}_{4}^{-} \rightarrow \mathrm{Mn}^{2+}\)
2 \(\mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{Cr}^{3+}\)
3 \(\mathrm{MnO}_{4}^{2-} \rightarrow \mathrm{MnO}_{2}\)
4 \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \rightarrow 2 \mathrm{Cr}^{3+}\)
CHXI08:REDOX REACTIONS

315222 The oxidation state of iodine in \(\mathrm{\mathrm{H}_{4} \mathrm{IO}_{6}}\) is

1 \({\rm{ + 7}}\)
2 \({\rm{ - 1}}\)
3 \({\rm{ + 5}}\)
4 \({\rm{ + 1}}\)
CHXI08:REDOX REACTIONS

315223 In how many of the following, chlorine has positive oxidation number?
\({\mathrm{\mathrm{HCl}, \mathrm{Cl}_{2} \mathrm{O}, \mathrm{KCl}, \mathrm{HOCl}, \mathrm{Cl}_{2}, \mathrm{MgCl}_{2}, \mathrm{ClO}_{4}^{-}, \mathrm{ClO}_{2}}}\).

1 2
2 3
3 5
4 4
CHXI08:REDOX REACTIONS

315225 Of the following reactions, the one in which oxidation number of ' \(\mathrm{\mathrm{N}}\) ' does not change is

1 \(\mathrm{2 \mathrm{NO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{HNO}_{3}+\mathrm{HNO}_{2}}\)
2 \(\mathrm{\mathrm{N}_{2}+\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}}\)
3 \(\mathrm{2 \mathrm{NO}_{2} \rightarrow \mathrm{N}_{2} \mathrm{O}_{4}}\)
4 \(\mathrm{\mathrm{NH}_{4} \mathrm{NO}_{2} \rightarrow \mathrm{N}_{2}+2 \mathrm{H}_{2} \mathrm{O}}\)
CHXI08:REDOX REACTIONS

315226 Of the following electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

1 \(\mathrm{(\mathrm{n}-1) \mathrm{d}^{8} \mathrm{~ns}^{2}}\)
2 \(\mathrm{(n-1) d^{5} n s^{2}}\)
3 \(\mathrm{(n-1) d^{3} n s^{2}}\)
4 \(\mathrm{(n-1) d^{5} n s^{1}}\)
NEET DIGITAL LIBRARY
CHXI08:REDOX REACTIONS

315221 Which of the following conversions involves gain of 5 electrons per ion?

1 \(\mathrm{MnO}_{4}^{-} \rightarrow \mathrm{Mn}^{2+}\)
2 \(\mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{Cr}^{3+}\)
3 \(\mathrm{MnO}_{4}^{2-} \rightarrow \mathrm{MnO}_{2}\)
4 \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \rightarrow 2 \mathrm{Cr}^{3+}\)
CHXI08:REDOX REACTIONS

315222 The oxidation state of iodine in \(\mathrm{\mathrm{H}_{4} \mathrm{IO}_{6}}\) is

1 \({\rm{ + 7}}\)
2 \({\rm{ - 1}}\)
3 \({\rm{ + 5}}\)
4 \({\rm{ + 1}}\)
CHXI08:REDOX REACTIONS

315223 In how many of the following, chlorine has positive oxidation number?
\({\mathrm{\mathrm{HCl}, \mathrm{Cl}_{2} \mathrm{O}, \mathrm{KCl}, \mathrm{HOCl}, \mathrm{Cl}_{2}, \mathrm{MgCl}_{2}, \mathrm{ClO}_{4}^{-}, \mathrm{ClO}_{2}}}\).

1 2
2 3
3 5
4 4
CHXI08:REDOX REACTIONS

315225 Of the following reactions, the one in which oxidation number of ' \(\mathrm{\mathrm{N}}\) ' does not change is

1 \(\mathrm{2 \mathrm{NO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{HNO}_{3}+\mathrm{HNO}_{2}}\)
2 \(\mathrm{\mathrm{N}_{2}+\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}}\)
3 \(\mathrm{2 \mathrm{NO}_{2} \rightarrow \mathrm{N}_{2} \mathrm{O}_{4}}\)
4 \(\mathrm{\mathrm{NH}_{4} \mathrm{NO}_{2} \rightarrow \mathrm{N}_{2}+2 \mathrm{H}_{2} \mathrm{O}}\)
CHXI08:REDOX REACTIONS

315226 Of the following electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

1 \(\mathrm{(\mathrm{n}-1) \mathrm{d}^{8} \mathrm{~ns}^{2}}\)
2 \(\mathrm{(n-1) d^{5} n s^{2}}\)
3 \(\mathrm{(n-1) d^{3} n s^{2}}\)
4 \(\mathrm{(n-1) d^{5} n s^{1}}\)