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Relationship between Vapor Density & Relative Molecular Mass

1.0 mL of K...

Question

$1.0$ mL of $K M n O_{4}$ solution reacts with $0.125$ g $F e^{2 +}$ . If $1.0$ mL $K H C_{2} O_{4} . H_{2} C_{2} O_{4}$ solution reacts with $0.175$ mL of same $K M n O_{4}$ solution, 8.4 ml volume of $0.2 M N a O H$ which will be used to neutralise $1.0$ mL of tetroxalate solution (all the three protons in tetroxalate are titrable).

A

True

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B

False

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Solution

The correct option is A True
$M n O_{4}^{-} + 5 F e^{2 +} + 8 H^{+} \to 5 F e^{3 +} + M n^{2 +} + 4 H_{2} O$
The molar mass of iron is 55.8 g/mol. 0.125 g of Fe(II) ions corresponds to $\frac{0.125}{55.8} = 0.00224$ moles. They will react with $\frac{0.00224}{5} = 0.000448$ moles of $K M n O_{4}$ .
$2 M n O_{4}^{-} + 5 H_{2} C_{2} O_{4} + 6 H^{+} \to 2 M n^{2 +} + 10 C O_{2} + 8 H_{2} O$
0.000448 moles of $K M n O_{4}$ will react with $0.000448 \times \frac{5}{4} = 0.00056$ moles of tetraoxalate.
0.00056 moles of tetraoxalate will be neutralized with $3 \times 0.00056 = 0.00168$ moles of NaOH.
Volume of 0.2 M NaOH solution required $= \frac{0.00168}{0.2} = 0.0084 L = 8.4 m L$

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Similar questions

Q. Oxalic acid,

H_{2} C_{2} O_{4}

, reacts with paramagnet ion according to the balanced equation

5 H_{2} C_{2} O_{4} (a q) + 2 M n O_{4}^{-} (a q) ⇌ 2 M n^{2 +} (a q) + 10 C O_{2} (g) + 8 H_{2} O (l)

. The volume in mL of

0.0162

K M n O_{4}

solution required to react with

25.0

0.022

H_{2} C_{2} O_{4}

Q. A solution of

K M n O_{4}

3

g/L is titrated with a solution of

H_{2} O_{2}

2

The volume (in ml) of

K M n O_{4}

required to react with

20

H_{2} O_{2}

solution is: (as nearest integer)

10 g

C u S

C u_{2} S

was treated with

100 m L

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

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

S O_{2}

. The excess oxidant was reacted with

50 m L

F e^{2 +}

25 m L

F e^{2 +}

solution required

0.875 M K M n O_{4}

under acidic condition, the volume of

K M n O_{4}

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}

20

H_{2} O_{2}

reacts completely with acidified

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

40

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

solution was required to oxidise the

H_{2} O_{2}

completely. Also,

2.0

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

solution required

5.0

1.0 M

H_{2} C_{2} O_{4}

solution to reach the equivalence point. Which of the following statements is/are correct?

20

H_{2} O_{2}

solution reacts with

80

0.05 M

{K M n O}_{4}

in acidic medium, then what is the volume strength of

H_{2} O_{2}

?

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