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Potassium Permanganate

Which of the ...

Question

Which of the following statements is not true about $K M n O_{4}$ ?

Its solution is unstable in acidic medium.

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A green coloured solution containing

M n O_{3}^{+}

ions is formed when a small quantity of

K M n O_{4}

is added to concentrated

H_{2} S O_{4}

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M n O_{4}^{-}

changes to

M n^{2 +}

in basic solution.

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It acts as a self-indicator in the titration with

F e^{2 +}

C_{2} O_{4}^{2 -}

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Solution

The correct option is C $M n O_{4}^{-}$ changes to $M n^{2 +}$ in basic solution.
The solution of $K M n O_{4}$ is unstable in acidic medium. Also, a green coloured solution containing $M n O_{3}^{+}$ ions is formed when a small quantity of $K M n O_{4}$ is added to concenrated $H_{2} S O_{4}$ . It acts as a self indicator in the titration with $F e^{2 +}$ or $C_{2} O_{4}^{2 -}$ .
However, in dilute alkaline solution, $M n O_{4}^{-}$ changes to $M n O_{4}^{2 -}$ . In this reaction, $M n (V I I)$ accepts an electron to form $M n (V I)$ .
$M n O_{4}^{-} \to M n O_{4}^{2 -} + e^{-}$
It may also form $M n O_{2}$ .
Hence, option C is incorrect.

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Similar questions

The following titration method is given to determine the total content of the species with variable oxidation states. Answer the question given at the end of it.

A quantity of

25.0

mL of solution containing both

F e^{2 +}

and

F e^{3 +}

ions is titrated with

25.0

mL of

0.02 M

K M n O_{4}

(in dilute

H_{2} S O_{4}

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F e^{2 +}

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The following titration method is given to determine the total content of the species with variable oxidation states. Answer the question given at the end of it.

A quantity of

25.0

mL of solution containing both

F e^{2 +}

and

F e^{3 +}

ions is titrated with

25.0

mL of

0.02 M

K M n O_{4}

(in dilute

H_{2} S O_{4}

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F e^{2 +}

ions are oxidised to

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mL of the original solution is treated with

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metal. Finally, the solution requires

40.0

mL of the same

K M n O_{4}

solution for oxidation to

F e^{3 +}

{M n O_{4}}^{-} + 5 F e^{2 +} + 8 H^{+} \to M n^{2 +} + 5 F e^{3 +} + 4 H_{2} O

Above titration takes place in acidic medium. Acid chosen is :

The following titration method is given to determine the total content of the species with variable oxidation states. Answer the question given at the end of it.

A quantity of

25.0

mL of solution containing both

F e^{2 +}

and

F e^{3 +}

ions is titrated with

25.0

mL of

0.02 M

K M n O_{4}

(in dilute

H_{2} S O_{4}

). As a result, all of the

F e^{2 +}

ions are oxidised to

F e^{3 +}

ions. Next

25

mL of the original solution is treated with

Z n

metal. Finally, the solution requires

40.0

mL of the same

K M n O_{4}

solution for oxidation to

F e^{3 +}

{M n O_{4}}^{-} + 5 F e^{2 +} + 8 H^{+} \to M n^{2 +} + 5 F e^{3 +} + 4 H_{2} O

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Which of the following statements is not true about KMnO4?

Which of the following statements is not true about $K M n O_{4}$ ?