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Standard X

Chemistry

Effect on Indicators by Acids and Bases

25 mL of 0....

Question

$25$ mL of $0.50 M H_{2} O_{2}$ solution is added to $50$ mL of $0.20 M K M n O_{4}$ in acid solution. Which of the following statements is/are true?

0.010

mol of oxygen is liberated.

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0.005

mol of

K M n O_{4}

is left.

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0.030

g atom of oxygen gas is evolved.

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0.0025

mol

H_{2} O_{2}

does not react with

K M n O_{4}

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Solution

The correct option is B $0.005$ mol of $K M n O_{4}$ is left.
Millimoles of $H_{2} O_{2} = 25 \times 0.5 = 12.5$
Millimoles of $K M n O_{4} = 50 \times 0.2 = 10$
$1$ millimole $K M n O_{4}$ oxidizes $2.5$ millimoles of $H_{2} O_{2}$ .
So, amount of $K M n O_{4}$ used to oxidize $12.5$ millimoles of $H_{2} O_{2} = \frac{12.5}{2.5} = 5$
Amount of $O_{2}$ generated $= \frac{12.5}{2} = 6.25$ millimoles
Hence, B is the correct answer.

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Similar questions

Q. A solution of

K M n O_{4}

containing

3

g/L is titrated with a solution of

H_{2} O_{2}

containing

2

g/L.

The volume (in ml) of

K M n O_{4}

required to react with

20

H_{2} O_{2}

solution is: (as nearest integer)

3.2 g

of pyrolusite

(M n O_{2})

was treated with

50 m L

0.5 M

oxalic acid and some sulphuric acid. The oxalic acid left undecomposed was raised to

250 m L

in a flask.

25 m L

of this solution when treated with

0.02 M K M n O_{4}

required

32 m L

of the solution. Find the percentage of

M n O_{2}

in the sample.
Given: Atomic mass of

M n

55 g m o l^{- 1}

Q. The molality

(m)

K M n O_{4}

in the acidic medium is :
(Density of

K M n O_{4}

solution

= 1.58 g

m L^{- 1}

and

M W

(K M n O_{4}) = 158 g

m o l^{- 1}

)

Q. 50 ml of

H_{2} O_{2}

solution when titrated with 0.1 M

K M n O_{4}

solution in acidic medium, volume required is 40 ml. Volume strength of

H_{2} O_{2}

solution is

Q. A

10 g

sample of

C u S

and

C u_{2} S

was treated with

100 m L

1.25 M K_{2} C r_{2} O_{7}

to produce

C r^{3 +}, C u^{2 +}

and

S O_{2}

. The excess oxidant was reacted with

50 m L

F e^{2 +}

solution.

25 m L

of the same

F e^{2 +}

solution required

0.875 M K M n O_{4}

under acidic condition, the volume of

K M n O_{4}

used was

20 m L

. Find the percentage of

C u_{2} S

in the sample.
Given: molar mass of

C u

63.5 g m o l^{- 1}

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25 mL of 0.50 M H2O2 solution is added to 50 mL of 0.20 M KMnO4 in acid solution. Which of the following statements is/are true?

$25$ mL of $0.50 M H_{2} O_{2}$ solution is added to $50$ mL of $0.20 M K M n O_{4}$ in acid solution. Which of the following statements is/are true?