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Standard XII

Chemistry

Bleaching Powder

17. A 10 g mi...

Question

17. A 10 g mixture of Cu2S and CuS was treated with 200 ml of 0.75 M MnO4 in acid solution producing SO2, Cu22+ and Mn2+. The SO2 was boiled off and the excess MnO4 was titrated with 175 mL of 1 M Fe2+ solution. Calculate the percentage of CuS in the original solution Options: 42.6% 57.4% 27.6% 72.4%

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Q. A

10

g mixture of

C u_{2} S

and

C u S

was treated with

200

mL of

0.75 M M n O_{4}^{-}

in acid solution producing

S O_{2}

C u^{2 +}

and

M n^{2 +}

. The

S O_{2}

was boiled off and the excess of

M n O_{4}^{-}

was titrated with

175

mL of

1 M F e^{2 +}

solution. Calculate the percentage of

C u S

in the original mixture (to nearest integer).

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}

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}

1

g of a moist sample of a mixture of

K C l O_{3}

and

K C l

was dissolved in water and made upto

250

mL.

25

mL of this solution was treated with

S O_{2}

to reduce chlorate into chloride and the excess

S O_{2}

was boiled off. When the total chloride was precipitated,

0.1435

g of AgCI was obtained. In another experiment,

25

mL of the original solution was treated with

30

mL of

0.2

N solution of

F e S O_{4}

and unreacted

F e S O_{4}

required

37.5

mL of

0.08

N solution of an oxidizing agent for complete oxidation. The molar ratio of chlorate and chloride in the given mixture

F e^{2 +}

reacts with

C I O_{3}^{-}

according to equation,

C l O_{3}^{-} + 6 F e^{2 +} + 6 H^{+} \to C I^{-} + 6 F e^{3 +} + 3 H_{2} O

, is :

Q. The chromium in a

1.0 g

sample of chromite

(F e C r_{2} O_{4})

was oxidized to

C r^{+ 6}

state by fusion with

N a_{2} O_{2}

. The fused mixture was treated with excess of water and boiled to destroy the excess of peroxide. After acidification, the sample was treated with

50 mL

0.16 M

F e S O_{4}

solution.

6.67 mL

0.05 M

C r_{2} O_{7}^{2 -}

solution was required to oxidize the

F e^{2 +}

ion left unreacted. Determine the mass percentage of chromite in the original sample

[C r = 52, F e = 56]

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