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CHEMISTRY(KCET)

285301 In the reaction between moist ${SO}_{2}$ and acidified permanganate solution :

1

{SO}_{2}

is oxidised to

{SO}_{4}^{2 -}, {MnO}_{4}^{-}

is reduced to

{Mn}^{2 +}

2

{SO}_{2}

is reduced to

S, {MnO}_{4}^{-}

is oxidised to

{MnO}_{4}

3

{SO}_{2}

is oxidised to

{SO}_{3}^{2 -}, {MnO}_{4}^{-}

is reduced to

{MnO}_{2}

4

{SO}_{2}

is reduced to

H_{2} S, {MnO}_{4}^{-}

is oxidised to

{MnO}_{4}

Explanation:

(a)
$2 \overset{+ 7}{{KMnO}_{4}} + \overset{+ 4}{{SO}_{2}} + 2 H_{2} O ⟶ \overset{+ 6}{K_{2}} \overset{+ 6}{{SO}_{4}} + 2 \overset{+ 2}{{MnSO}_{4}}$
Reduction
$+ 2 H_{2} {SO}_{4} (l)$
$∴ {MnO}_{4}^{-}$ is reduced to ${Mn}^{+ 2}$ and ${SO}_{2}$ is oxidised to ${SO}_{4}^{2 -}$ .

Karnataka CET 2024

CHEMISTRY(KCET)

285302 What is the oxidation number ofS in $H_{2} S_{2} O_{8}$ ?

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 $= 2 x$ .
$\Rightarrow$ Total charge $= 2 x + (- 14) = 2 x - 14 = - 2$
$\Rightarrow x = + 6$ .

Karnataka CET 2023

CHEMISTRY(KCET)

285303 ${aMnO}_{4}^{-} + {bS}_{2} O_{3}^{- 2} + H_{2} O \to$
${xMnO}_{2} + {ySO}_{4}^{- 2} + {zOH}^{-}$
a and y respectively are

1

8; 3

2

8; 6

3

3; 6

4

8; 8

Explanation:

(b) The balanced chemical equation is:-
$8 {MnO}_{4}^{- +} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to C$

Karnataka CET 2023

CHEMISTRY(KCET)

285304 In which of the following compounds, an element exhibits two different oxidationstates?

1

N_{2} H_{4}

2

N_{3} H

3

{NH}_{2} {CONH}_{2}

4

{NH}_{4} {NO}_{3}

Explanation:

(d) ${NH}_{4}^{+} {NO}_{3}^{-}$
Let oxidation state of N be $x$ in ${NH}_{4}^{+}$ then
$x + 4 (+ 1) = + 1 \Rightarrow x - 3$
In ${NO}_{3}^{-}, x - 3 (- 2) = - 1$ 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

Karnataka CET 2021

CHEMISTRY(KCET)

285301 In the reaction between moist ${SO}_{2}$ and acidified permanganate solution :

1

{SO}_{2}

is oxidised to

{SO}_{4}^{2 -}, {MnO}_{4}^{-}

is reduced to

{Mn}^{2 +}

2

{SO}_{2}

is reduced to

S, {MnO}_{4}^{-}

is oxidised to

{MnO}_{4}

3

{SO}_{2}

is oxidised to

{SO}_{3}^{2 -}, {MnO}_{4}^{-}

is reduced to

{MnO}_{2}

4

{SO}_{2}

is reduced to

H_{2} S, {MnO}_{4}^{-}

is oxidised to

{MnO}_{4}

Explanation:

(a)
$2 \overset{+ 7}{{KMnO}_{4}} + \overset{+ 4}{{SO}_{2}} + 2 H_{2} O ⟶ \overset{+ 6}{K_{2}} \overset{+ 6}{{SO}_{4}} + 2 \overset{+ 2}{{MnSO}_{4}}$
Reduction
$+ 2 H_{2} {SO}_{4} (l)$
$∴ {MnO}_{4}^{-}$ is reduced to ${Mn}^{+ 2}$ and ${SO}_{2}$ is oxidised to ${SO}_{4}^{2 -}$ .

Karnataka CET 2024

CHEMISTRY(KCET)

285302 What is the oxidation number ofS in $H_{2} S_{2} O_{8}$ ?

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 $= 2 x$ .
$\Rightarrow$ Total charge $= 2 x + (- 14) = 2 x - 14 = - 2$
$\Rightarrow x = + 6$ .

Karnataka CET 2023

CHEMISTRY(KCET)

285303 ${aMnO}_{4}^{-} + {bS}_{2} O_{3}^{- 2} + H_{2} O \to$
${xMnO}_{2} + {ySO}_{4}^{- 2} + {zOH}^{-}$
a and y respectively are

1

8; 3

2

8; 6

3

3; 6

4

8; 8

Explanation:

(b) The balanced chemical equation is:-
$8 {MnO}_{4}^{- +} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to C$

Karnataka CET 2023

CHEMISTRY(KCET)

285304 In which of the following compounds, an element exhibits two different oxidationstates?

1

N_{2} H_{4}

2

N_{3} H

3

{NH}_{2} {CONH}_{2}

4

{NH}_{4} {NO}_{3}

Explanation:

(d) ${NH}_{4}^{+} {NO}_{3}^{-}$
Let oxidation state of N be $x$ in ${NH}_{4}^{+}$ then
$x + 4 (+ 1) = + 1 \Rightarrow x - 3$
In ${NO}_{3}^{-}, x - 3 (- 2) = - 1$ 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

Karnataka CET 2021

CHEMISTRY(KCET)

285301 In the reaction between moist ${SO}_{2}$ and acidified permanganate solution :

1

{SO}_{2}

is oxidised to

{SO}_{4}^{2 -}, {MnO}_{4}^{-}

is reduced to

{Mn}^{2 +}

2

{SO}_{2}

is reduced to

S, {MnO}_{4}^{-}

is oxidised to

{MnO}_{4}

3

{SO}_{2}

is oxidised to

{SO}_{3}^{2 -}, {MnO}_{4}^{-}

is reduced to

{MnO}_{2}

4

{SO}_{2}

is reduced to

H_{2} S, {MnO}_{4}^{-}

is oxidised to

{MnO}_{4}

Explanation:

(a)
$2 \overset{+ 7}{{KMnO}_{4}} + \overset{+ 4}{{SO}_{2}} + 2 H_{2} O ⟶ \overset{+ 6}{K_{2}} \overset{+ 6}{{SO}_{4}} + 2 \overset{+ 2}{{MnSO}_{4}}$
Reduction
$+ 2 H_{2} {SO}_{4} (l)$
$∴ {MnO}_{4}^{-}$ is reduced to ${Mn}^{+ 2}$ and ${SO}_{2}$ is oxidised to ${SO}_{4}^{2 -}$ .

Karnataka CET 2024

CHEMISTRY(KCET)

285302 What is the oxidation number ofS in $H_{2} S_{2} O_{8}$ ?

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 $= 2 x$ .
$\Rightarrow$ Total charge $= 2 x + (- 14) = 2 x - 14 = - 2$
$\Rightarrow x = + 6$ .

Karnataka CET 2023

CHEMISTRY(KCET)

285303 ${aMnO}_{4}^{-} + {bS}_{2} O_{3}^{- 2} + H_{2} O \to$
${xMnO}_{2} + {ySO}_{4}^{- 2} + {zOH}^{-}$
a and y respectively are

1

8; 3

2

8; 6

3

3; 6

4

8; 8

Explanation:

(b) The balanced chemical equation is:-
$8 {MnO}_{4}^{- +} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to C$

Karnataka CET 2023

CHEMISTRY(KCET)

285304 In which of the following compounds, an element exhibits two different oxidationstates?

1

N_{2} H_{4}

2

N_{3} H

3

{NH}_{2} {CONH}_{2}

4

{NH}_{4} {NO}_{3}

Explanation:

(d) ${NH}_{4}^{+} {NO}_{3}^{-}$
Let oxidation state of N be $x$ in ${NH}_{4}^{+}$ then
$x + 4 (+ 1) = + 1 \Rightarrow x - 3$
In ${NO}_{3}^{-}, x - 3 (- 2) = - 1$ 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

Karnataka CET 2021

CHEMISTRY(KCET)

285301 In the reaction between moist ${SO}_{2}$ and acidified permanganate solution :

1

{SO}_{2}

is oxidised to

{SO}_{4}^{2 -}, {MnO}_{4}^{-}

is reduced to

{Mn}^{2 +}

2

{SO}_{2}

is reduced to

S, {MnO}_{4}^{-}

is oxidised to

{MnO}_{4}

3

{SO}_{2}

is oxidised to

{SO}_{3}^{2 -}, {MnO}_{4}^{-}

is reduced to

{MnO}_{2}

4

{SO}_{2}

is reduced to

H_{2} S, {MnO}_{4}^{-}

is oxidised to

{MnO}_{4}

Explanation:

(a)
$2 \overset{+ 7}{{KMnO}_{4}} + \overset{+ 4}{{SO}_{2}} + 2 H_{2} O ⟶ \overset{+ 6}{K_{2}} \overset{+ 6}{{SO}_{4}} + 2 \overset{+ 2}{{MnSO}_{4}}$
Reduction
$+ 2 H_{2} {SO}_{4} (l)$
$∴ {MnO}_{4}^{-}$ is reduced to ${Mn}^{+ 2}$ and ${SO}_{2}$ is oxidised to ${SO}_{4}^{2 -}$ .

Karnataka CET 2024

CHEMISTRY(KCET)

285302 What is the oxidation number ofS in $H_{2} S_{2} O_{8}$ ?

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 $= 2 x$ .
$\Rightarrow$ Total charge $= 2 x + (- 14) = 2 x - 14 = - 2$
$\Rightarrow x = + 6$ .

Karnataka CET 2023

CHEMISTRY(KCET)

285303 ${aMnO}_{4}^{-} + {bS}_{2} O_{3}^{- 2} + H_{2} O \to$
${xMnO}_{2} + {ySO}_{4}^{- 2} + {zOH}^{-}$
a and y respectively are

1

8; 3

2

8; 6

3

3; 6

4

8; 8

Explanation:

(b) The balanced chemical equation is:-
$8 {MnO}_{4}^{- +} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to C$

Karnataka CET 2023

CHEMISTRY(KCET)

285304 In which of the following compounds, an element exhibits two different oxidationstates?

1

N_{2} H_{4}

2

N_{3} H

3

{NH}_{2} {CONH}_{2}

4

{NH}_{4} {NO}_{3}

Explanation:

(d) ${NH}_{4}^{+} {NO}_{3}^{-}$
Let oxidation state of N be $x$ in ${NH}_{4}^{+}$ then
$x + 4 (+ 1) = + 1 \Rightarrow x - 3$
In ${NO}_{3}^{-}, x - 3 (- 2) = - 1$ 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

Karnataka CET 2021

CHEMISTRY(KCET)

285301 In the reaction between moist ${SO}_{2}$ and acidified permanganate solution :

1

{SO}_{2}

is oxidised to

{SO}_{4}^{2 -}, {MnO}_{4}^{-}

is reduced to

{Mn}^{2 +}

2

{SO}_{2}

is reduced to

S, {MnO}_{4}^{-}

is oxidised to

{MnO}_{4}

3

{SO}_{2}

is oxidised to

{SO}_{3}^{2 -}, {MnO}_{4}^{-}

is reduced to

{MnO}_{2}

4

{SO}_{2}

is reduced to

H_{2} S, {MnO}_{4}^{-}

is oxidised to

{MnO}_{4}

Explanation:

(a)
$2 \overset{+ 7}{{KMnO}_{4}} + \overset{+ 4}{{SO}_{2}} + 2 H_{2} O ⟶ \overset{+ 6}{K_{2}} \overset{+ 6}{{SO}_{4}} + 2 \overset{+ 2}{{MnSO}_{4}}$
Reduction
$+ 2 H_{2} {SO}_{4} (l)$
$∴ {MnO}_{4}^{-}$ is reduced to ${Mn}^{+ 2}$ and ${SO}_{2}$ is oxidised to ${SO}_{4}^{2 -}$ .

Karnataka CET 2024

CHEMISTRY(KCET)

285302 What is the oxidation number ofS in $H_{2} S_{2} O_{8}$ ?

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 $= 2 x$ .
$\Rightarrow$ Total charge $= 2 x + (- 14) = 2 x - 14 = - 2$
$\Rightarrow x = + 6$ .

Karnataka CET 2023

CHEMISTRY(KCET)

285303 ${aMnO}_{4}^{-} + {bS}_{2} O_{3}^{- 2} + H_{2} O \to$
${xMnO}_{2} + {ySO}_{4}^{- 2} + {zOH}^{-}$
a and y respectively are

1

8; 3

2

8; 6

3

3; 6

4

8; 8

Explanation:

(b) The balanced chemical equation is:-
$8 {MnO}_{4}^{- +} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to C$

Karnataka CET 2023

CHEMISTRY(KCET)

285304 In which of the following compounds, an element exhibits two different oxidationstates?

1

N_{2} H_{4}

2

N_{3} H

3

{NH}_{2} {CONH}_{2}

4

{NH}_{4} {NO}_{3}

Explanation:

(d) ${NH}_{4}^{+} {NO}_{3}^{-}$
Let oxidation state of N be $x$ in ${NH}_{4}^{+}$ then
$x + 4 (+ 1) = + 1 \Rightarrow x - 3$
In ${NO}_{3}^{-}, x - 3 (- 2) = - 1$ 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

Karnataka CET 2021

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