285301
In the reaction between moist\(\mathrm{SO}_2\) and acidified permanganate solution :
1 \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_4^{2-}, \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{Mn}^{2+}\)
2 \(\mathrm{SO}_2\) is reduced to \(\mathrm{S}, \mathrm{MnO}_4^{-}\)is oxidised to \(\mathrm{MnO}_4\)
3 \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_3^{2-}, \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{MnO}_2\)
4 \(\mathrm{SO}_2\) is reduced to \(\mathrm{H}_2 \mathrm{~S}, \mathrm{MnO}_4^{-}\)is oxidised to \(\mathrm{MnO}_4\)
Explanation:
(a)
\(2 \stackrel{+7}{\mathrm{KMnO}_4}+\stackrel{+4}{\mathrm{SO}_2}+2 \mathrm{H}_2 \mathrm{O} \longrightarrow \stackrel{+6}{\mathrm{~K}_2} \stackrel{+6}{\mathrm{SO}_4}+2 \stackrel{+2}{\mathrm{MnSO}_4}\)
Reduction
\(+2 \mathrm{H}_2 \mathrm{SO}_4(\mathrm{l})\)
\(\therefore \quad \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{Mn}^{+2}\) and \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_4^{2-}\).
Karnataka CET 2024
CHEMISTRY(KCET)
285302
What is the oxidation number ofS in \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8\) ?
1 +5
2 +4
3 +7
4 +6
Explanation:
(d)
Thus, there are two peroxide ions and six oxide ions.
\(\Rightarrow\) negative charge \(=(-1 \times 2)+(-2 \times 6)=-14\)
Positive charge \(=2 \mathrm{x}\).
\(\Rightarrow\) Total charge \(=2 x+(-14)=2 x-14=-2\)
\(\Rightarrow \mathrm{x}=+6\).
Karnataka CET 2023
CHEMISTRY(KCET)
285303
\(\mathrm{aMnO}_4^{-}+\mathrm{bS}_2 \mathrm{O}_3^{-2}+\mathrm{H}_2 \mathrm{O} \rightarrow\)
\(\mathrm{xMnO}_2+\mathrm{ySO}_4^{-2}+\mathrm{zOH}^{-}\)
a and y respectively are
1 \(8 ; 3\)
2 \(8 ; 6\)
3 \(3 ; 6\)
4 \(8 ; 8\)
Explanation:
(b) The balanced chemical equation is:-
\(8 \mathrm{MnO}_4^{-+}+3 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{C}\)
Karnataka CET 2023
CHEMISTRY(KCET)
285304
In which of the following compounds, an element exhibits two different oxidationstates?
1 \(\mathrm{N}_2 \mathrm{H}_4\)
2 \(\mathrm{N}_3 \mathrm{H}\)
3 \(\mathrm{NH}_2 \mathrm{CONH}_2\)
4 \(\mathrm{NH}_4 \mathrm{NO}_3\)
Explanation:
(d) \(\mathrm{NH}_4^{+} \mathrm{NO}_3^{-}\)
Let oxidation state of N be \(x\) in \(\mathrm{NH}_4^{+}\)then
\(x+4(+1)=+1 \Rightarrow x-3\)
In \(\mathrm{NO}_3^{-}, x-3(-2)=-1\) then \(x=+5\)
Karnataka CET 2022
CHEMISTRY(KCET)
285305
Which of the following is not true for oxidation?
1 Addition of oxygen
2 Addition of an electronegative element
3 Removal of hydrogen
4 Removal of an electronegative element
Explanation:
(d) Removal of electronegative element results in reduction of that species.
285301
In the reaction between moist\(\mathrm{SO}_2\) and acidified permanganate solution :
1 \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_4^{2-}, \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{Mn}^{2+}\)
2 \(\mathrm{SO}_2\) is reduced to \(\mathrm{S}, \mathrm{MnO}_4^{-}\)is oxidised to \(\mathrm{MnO}_4\)
3 \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_3^{2-}, \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{MnO}_2\)
4 \(\mathrm{SO}_2\) is reduced to \(\mathrm{H}_2 \mathrm{~S}, \mathrm{MnO}_4^{-}\)is oxidised to \(\mathrm{MnO}_4\)
Explanation:
(a)
\(2 \stackrel{+7}{\mathrm{KMnO}_4}+\stackrel{+4}{\mathrm{SO}_2}+2 \mathrm{H}_2 \mathrm{O} \longrightarrow \stackrel{+6}{\mathrm{~K}_2} \stackrel{+6}{\mathrm{SO}_4}+2 \stackrel{+2}{\mathrm{MnSO}_4}\)
Reduction
\(+2 \mathrm{H}_2 \mathrm{SO}_4(\mathrm{l})\)
\(\therefore \quad \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{Mn}^{+2}\) and \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_4^{2-}\).
Karnataka CET 2024
CHEMISTRY(KCET)
285302
What is the oxidation number ofS in \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8\) ?
1 +5
2 +4
3 +7
4 +6
Explanation:
(d)
Thus, there are two peroxide ions and six oxide ions.
\(\Rightarrow\) negative charge \(=(-1 \times 2)+(-2 \times 6)=-14\)
Positive charge \(=2 \mathrm{x}\).
\(\Rightarrow\) Total charge \(=2 x+(-14)=2 x-14=-2\)
\(\Rightarrow \mathrm{x}=+6\).
Karnataka CET 2023
CHEMISTRY(KCET)
285303
\(\mathrm{aMnO}_4^{-}+\mathrm{bS}_2 \mathrm{O}_3^{-2}+\mathrm{H}_2 \mathrm{O} \rightarrow\)
\(\mathrm{xMnO}_2+\mathrm{ySO}_4^{-2}+\mathrm{zOH}^{-}\)
a and y respectively are
1 \(8 ; 3\)
2 \(8 ; 6\)
3 \(3 ; 6\)
4 \(8 ; 8\)
Explanation:
(b) The balanced chemical equation is:-
\(8 \mathrm{MnO}_4^{-+}+3 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{C}\)
Karnataka CET 2023
CHEMISTRY(KCET)
285304
In which of the following compounds, an element exhibits two different oxidationstates?
1 \(\mathrm{N}_2 \mathrm{H}_4\)
2 \(\mathrm{N}_3 \mathrm{H}\)
3 \(\mathrm{NH}_2 \mathrm{CONH}_2\)
4 \(\mathrm{NH}_4 \mathrm{NO}_3\)
Explanation:
(d) \(\mathrm{NH}_4^{+} \mathrm{NO}_3^{-}\)
Let oxidation state of N be \(x\) in \(\mathrm{NH}_4^{+}\)then
\(x+4(+1)=+1 \Rightarrow x-3\)
In \(\mathrm{NO}_3^{-}, x-3(-2)=-1\) then \(x=+5\)
Karnataka CET 2022
CHEMISTRY(KCET)
285305
Which of the following is not true for oxidation?
1 Addition of oxygen
2 Addition of an electronegative element
3 Removal of hydrogen
4 Removal of an electronegative element
Explanation:
(d) Removal of electronegative element results in reduction of that species.
285301
In the reaction between moist\(\mathrm{SO}_2\) and acidified permanganate solution :
1 \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_4^{2-}, \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{Mn}^{2+}\)
2 \(\mathrm{SO}_2\) is reduced to \(\mathrm{S}, \mathrm{MnO}_4^{-}\)is oxidised to \(\mathrm{MnO}_4\)
3 \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_3^{2-}, \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{MnO}_2\)
4 \(\mathrm{SO}_2\) is reduced to \(\mathrm{H}_2 \mathrm{~S}, \mathrm{MnO}_4^{-}\)is oxidised to \(\mathrm{MnO}_4\)
Explanation:
(a)
\(2 \stackrel{+7}{\mathrm{KMnO}_4}+\stackrel{+4}{\mathrm{SO}_2}+2 \mathrm{H}_2 \mathrm{O} \longrightarrow \stackrel{+6}{\mathrm{~K}_2} \stackrel{+6}{\mathrm{SO}_4}+2 \stackrel{+2}{\mathrm{MnSO}_4}\)
Reduction
\(+2 \mathrm{H}_2 \mathrm{SO}_4(\mathrm{l})\)
\(\therefore \quad \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{Mn}^{+2}\) and \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_4^{2-}\).
Karnataka CET 2024
CHEMISTRY(KCET)
285302
What is the oxidation number ofS in \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8\) ?
1 +5
2 +4
3 +7
4 +6
Explanation:
(d)
Thus, there are two peroxide ions and six oxide ions.
\(\Rightarrow\) negative charge \(=(-1 \times 2)+(-2 \times 6)=-14\)
Positive charge \(=2 \mathrm{x}\).
\(\Rightarrow\) Total charge \(=2 x+(-14)=2 x-14=-2\)
\(\Rightarrow \mathrm{x}=+6\).
Karnataka CET 2023
CHEMISTRY(KCET)
285303
\(\mathrm{aMnO}_4^{-}+\mathrm{bS}_2 \mathrm{O}_3^{-2}+\mathrm{H}_2 \mathrm{O} \rightarrow\)
\(\mathrm{xMnO}_2+\mathrm{ySO}_4^{-2}+\mathrm{zOH}^{-}\)
a and y respectively are
1 \(8 ; 3\)
2 \(8 ; 6\)
3 \(3 ; 6\)
4 \(8 ; 8\)
Explanation:
(b) The balanced chemical equation is:-
\(8 \mathrm{MnO}_4^{-+}+3 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{C}\)
Karnataka CET 2023
CHEMISTRY(KCET)
285304
In which of the following compounds, an element exhibits two different oxidationstates?
1 \(\mathrm{N}_2 \mathrm{H}_4\)
2 \(\mathrm{N}_3 \mathrm{H}\)
3 \(\mathrm{NH}_2 \mathrm{CONH}_2\)
4 \(\mathrm{NH}_4 \mathrm{NO}_3\)
Explanation:
(d) \(\mathrm{NH}_4^{+} \mathrm{NO}_3^{-}\)
Let oxidation state of N be \(x\) in \(\mathrm{NH}_4^{+}\)then
\(x+4(+1)=+1 \Rightarrow x-3\)
In \(\mathrm{NO}_3^{-}, x-3(-2)=-1\) then \(x=+5\)
Karnataka CET 2022
CHEMISTRY(KCET)
285305
Which of the following is not true for oxidation?
1 Addition of oxygen
2 Addition of an electronegative element
3 Removal of hydrogen
4 Removal of an electronegative element
Explanation:
(d) Removal of electronegative element results in reduction of that species.
285301
In the reaction between moist\(\mathrm{SO}_2\) and acidified permanganate solution :
1 \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_4^{2-}, \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{Mn}^{2+}\)
2 \(\mathrm{SO}_2\) is reduced to \(\mathrm{S}, \mathrm{MnO}_4^{-}\)is oxidised to \(\mathrm{MnO}_4\)
3 \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_3^{2-}, \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{MnO}_2\)
4 \(\mathrm{SO}_2\) is reduced to \(\mathrm{H}_2 \mathrm{~S}, \mathrm{MnO}_4^{-}\)is oxidised to \(\mathrm{MnO}_4\)
Explanation:
(a)
\(2 \stackrel{+7}{\mathrm{KMnO}_4}+\stackrel{+4}{\mathrm{SO}_2}+2 \mathrm{H}_2 \mathrm{O} \longrightarrow \stackrel{+6}{\mathrm{~K}_2} \stackrel{+6}{\mathrm{SO}_4}+2 \stackrel{+2}{\mathrm{MnSO}_4}\)
Reduction
\(+2 \mathrm{H}_2 \mathrm{SO}_4(\mathrm{l})\)
\(\therefore \quad \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{Mn}^{+2}\) and \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_4^{2-}\).
Karnataka CET 2024
CHEMISTRY(KCET)
285302
What is the oxidation number ofS in \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8\) ?
1 +5
2 +4
3 +7
4 +6
Explanation:
(d)
Thus, there are two peroxide ions and six oxide ions.
\(\Rightarrow\) negative charge \(=(-1 \times 2)+(-2 \times 6)=-14\)
Positive charge \(=2 \mathrm{x}\).
\(\Rightarrow\) Total charge \(=2 x+(-14)=2 x-14=-2\)
\(\Rightarrow \mathrm{x}=+6\).
Karnataka CET 2023
CHEMISTRY(KCET)
285303
\(\mathrm{aMnO}_4^{-}+\mathrm{bS}_2 \mathrm{O}_3^{-2}+\mathrm{H}_2 \mathrm{O} \rightarrow\)
\(\mathrm{xMnO}_2+\mathrm{ySO}_4^{-2}+\mathrm{zOH}^{-}\)
a and y respectively are
1 \(8 ; 3\)
2 \(8 ; 6\)
3 \(3 ; 6\)
4 \(8 ; 8\)
Explanation:
(b) The balanced chemical equation is:-
\(8 \mathrm{MnO}_4^{-+}+3 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{C}\)
Karnataka CET 2023
CHEMISTRY(KCET)
285304
In which of the following compounds, an element exhibits two different oxidationstates?
1 \(\mathrm{N}_2 \mathrm{H}_4\)
2 \(\mathrm{N}_3 \mathrm{H}\)
3 \(\mathrm{NH}_2 \mathrm{CONH}_2\)
4 \(\mathrm{NH}_4 \mathrm{NO}_3\)
Explanation:
(d) \(\mathrm{NH}_4^{+} \mathrm{NO}_3^{-}\)
Let oxidation state of N be \(x\) in \(\mathrm{NH}_4^{+}\)then
\(x+4(+1)=+1 \Rightarrow x-3\)
In \(\mathrm{NO}_3^{-}, x-3(-2)=-1\) then \(x=+5\)
Karnataka CET 2022
CHEMISTRY(KCET)
285305
Which of the following is not true for oxidation?
1 Addition of oxygen
2 Addition of an electronegative element
3 Removal of hydrogen
4 Removal of an electronegative element
Explanation:
(d) Removal of electronegative element results in reduction of that species.
285301
In the reaction between moist\(\mathrm{SO}_2\) and acidified permanganate solution :
1 \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_4^{2-}, \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{Mn}^{2+}\)
2 \(\mathrm{SO}_2\) is reduced to \(\mathrm{S}, \mathrm{MnO}_4^{-}\)is oxidised to \(\mathrm{MnO}_4\)
3 \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_3^{2-}, \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{MnO}_2\)
4 \(\mathrm{SO}_2\) is reduced to \(\mathrm{H}_2 \mathrm{~S}, \mathrm{MnO}_4^{-}\)is oxidised to \(\mathrm{MnO}_4\)
Explanation:
(a)
\(2 \stackrel{+7}{\mathrm{KMnO}_4}+\stackrel{+4}{\mathrm{SO}_2}+2 \mathrm{H}_2 \mathrm{O} \longrightarrow \stackrel{+6}{\mathrm{~K}_2} \stackrel{+6}{\mathrm{SO}_4}+2 \stackrel{+2}{\mathrm{MnSO}_4}\)
Reduction
\(+2 \mathrm{H}_2 \mathrm{SO}_4(\mathrm{l})\)
\(\therefore \quad \mathrm{MnO}_4^{-}\)is reduced to \(\mathrm{Mn}^{+2}\) and \(\mathrm{SO}_2\) is oxidised to \(\mathrm{SO}_4^{2-}\).
Karnataka CET 2024
CHEMISTRY(KCET)
285302
What is the oxidation number ofS in \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8\) ?
1 +5
2 +4
3 +7
4 +6
Explanation:
(d)
Thus, there are two peroxide ions and six oxide ions.
\(\Rightarrow\) negative charge \(=(-1 \times 2)+(-2 \times 6)=-14\)
Positive charge \(=2 \mathrm{x}\).
\(\Rightarrow\) Total charge \(=2 x+(-14)=2 x-14=-2\)
\(\Rightarrow \mathrm{x}=+6\).
Karnataka CET 2023
CHEMISTRY(KCET)
285303
\(\mathrm{aMnO}_4^{-}+\mathrm{bS}_2 \mathrm{O}_3^{-2}+\mathrm{H}_2 \mathrm{O} \rightarrow\)
\(\mathrm{xMnO}_2+\mathrm{ySO}_4^{-2}+\mathrm{zOH}^{-}\)
a and y respectively are
1 \(8 ; 3\)
2 \(8 ; 6\)
3 \(3 ; 6\)
4 \(8 ; 8\)
Explanation:
(b) The balanced chemical equation is:-
\(8 \mathrm{MnO}_4^{-+}+3 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{C}\)
Karnataka CET 2023
CHEMISTRY(KCET)
285304
In which of the following compounds, an element exhibits two different oxidationstates?
1 \(\mathrm{N}_2 \mathrm{H}_4\)
2 \(\mathrm{N}_3 \mathrm{H}\)
3 \(\mathrm{NH}_2 \mathrm{CONH}_2\)
4 \(\mathrm{NH}_4 \mathrm{NO}_3\)
Explanation:
(d) \(\mathrm{NH}_4^{+} \mathrm{NO}_3^{-}\)
Let oxidation state of N be \(x\) in \(\mathrm{NH}_4^{+}\)then
\(x+4(+1)=+1 \Rightarrow x-3\)
In \(\mathrm{NO}_3^{-}, x-3(-2)=-1\) then \(x=+5\)
Karnataka CET 2022
CHEMISTRY(KCET)
285305
Which of the following is not true for oxidation?
1 Addition of oxygen
2 Addition of an electronegative element
3 Removal of hydrogen
4 Removal of an electronegative element
Explanation:
(d) Removal of electronegative element results in reduction of that species.
