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Chemical Properties of Alcohol

Hydrogen pero...

Question

Hydrogen peroxide solution (20 mL) reacts quantitatively with a solution of $K M n O_{4}$ (20 mL) acidified with dilute $H_{2} S O_{4}$ , The same volume of the $K M n O_{4}$ solution is just decolorized by 10mL of $M n S O_{4}$ in neutral medium simultaneously forming a dark brown precipitate of hydrated $M n O_{2}$ .
The brown pecipitate is dissolved in 10 mL of 0.2 M sodium oxalate under boiling condition in the presence of dilute $H_{2} S O_{4}$ , Write the balanced equations involved in the reactions and calculate the molarity of $H_{2} O_{2}$ .

A

M o l a r i t y = 0.05

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B

M o l a r i t y = 0.1

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C

M o l a r i t y = 0.2

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D

M o l a r i t y = 1

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Solution

The correct option is A $M o l a r i t y = 0.1$
$2 K M n O_{4} + 3 H_{2} S O_{4} + 5 H_{2} O_{2} \to K_{2} S O_{4} + 2 M n S O_{4} + 8 H_{2} O$
$2 K M n O_{4} + 3 M n S O_{4} + 2 H_{2} O_{2} \to 5 M n O_{2} + 2 H_{2} S O_{4} + K_{2} S O_{4}$
$M n O_{2} + N a_{2} C_{2} O_{4} + 2 H_{2} S O_{4} \to M n S O_{4} + N a_{2} S O_{4} + 2 H_{2} O + 2 C O_{2}$
Millimoles of $N a_{2} C_{2} O_{4} = 10 \times 0.2 = 2$
mEq of $N a_{2} C_{2} O_{4} = 4$

mEq of $M n O_{2} = 4$

mEq of $K M n O_{2} = 4$
mEq of $H 2 O_{2} = 4$
Millimoles of $H_{2} O_{2} = 2 \times 10^{- 3}$

$M o l a r i t y$ = $\frac{0.002}{20}$ $\times$ 1000 M

$M o l a r i t y = 0.1 M$

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Similar questions

Q. Hydrogen peroxide solution

(20 m L)

reacts quantitatively with a solution of

K M n O_{4} (20 m L)

acidified with dilute

H_{2} S O_{4}

. The same volume of the

K M n O_{4}

solution is just decolourised by

10 m L

M n S O_{4}

in neutral medium simultaneously forming a dark brown precipitate of hydrated

M n O_{2}

. The brown precipitate is dissolved in

10 m L

0.2 M

sodium oxalate under boiling condition in the presence of dilute

H_{2} S O_{4}

. Write the balanced equations involved in the reactions and calculate the molarity of

H_{2} O_{2}

Hydrogen peroxide solution (

20

mL) reacts quantitatively with a solution of

K M n O_{4}

20

mL) acidified with dilute

H_{2} S O_{4}

. The same volume of the

K M n O_{4}

solution is just decolourised by

10

M n S O_{4}

in neutral medium simultaneously forming a dark brown precipitate of hydrated

M n O_{2}

. The brown precipitate is dissolved in

10

0.2 M

sodium oxalate under boiling condition in the presence of dilute

H_{2} S O_{4}

Choose the correct balanced equation involved in the reaction.

20 m L

solution of hydrogen peroxide reacts quantitatively with a

20 m L

K M n O_{4}

acidified with dilute

H_{2} S O_{4} .

The same volume of the

K M n O_{4}

solution is decolourized by

10 m L

M n S O_{4}

in neutral medium simultaneously forming a dark brown precipitate of hydrated

M n O_{2} .

The brown precipitate is dissolved in

20 m L

0.2 M

sodium oxalate under boiling condition in the presence of dilute

H_{2} S O_{4} .

Calculate the volume strength of

H_{2} O_{2} .

Q. Hydrogen peroxide solution having volume of

20

mL reacts quantitatively with a solution of

K M n O_{4}

20

mL acidified with dilute

H_{2} S O_{4}

. The same volume of the

K M n O_{4}

solution is just decolourised by

10

M n S O_{4}

in a neutral medium simultaneously forming a dark-brown precipitate of hydrated

M n O_{2}

. The brown precipitate is dissolved in

10

0.2 M

sodium oxalate under boiling condition in the presence of dilute

H_{2} S O_{4}

. If the molarity of

H_{2} O_{2}

x

, then find the value of

10 x

6.3

gram of oxalic acid,

0.4

mole of oxalic acid and

0.2

gram equivalents of oxalic acid are dissolved in a

2

litre solution.

50

ml of this solution neutralises

20

K M n O_{4}

solution in acidic medium. Molarity of

K M n O_{4}

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