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Hydrochloric Acid

9. 4.35g of a...

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9. 4.35g of a sample of pyrolusite[MnO2] heated with concentrated HCl gave chlorine . the chlorine is then passed through KI solution liberated 6.35g of iodine .the percentage purity of pyrolusite sample is

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Q. A quantity of

4.35 g

of a sample of pyrolusite ore, when heated with conc.

H C l

, gave chlorine. The chlorine when passed through potassium iodide solution, liberated

6.35 g

of iodine. The percentage of pure

M n O_{2}

in the pyrolusite ore is:

(M n = 55, I = 127)

.

0.261 g

of a sample of pyrolusite was heated with an excess of

H C l

and the chlorine evolved was passed in a solution of

K I

. The liberated iodine required

90 m L \frac{N}{30} N a_{2} S_{2} O_{3}

. Calculate the percentage of

M n O_{2}

8.7

g of pyrolusite (impure

M n O_{2}

) was heated with conc.

H C l

C l_{2}

gas evolved was passed through excess of

K I

solution. The iodine gas evolved required

80

\frac{N}{10}

hypo solution. The percentage of

M n O_{2}

in pyrolusite will be :

Q. 5 g of pyrolusite (impure

M n O_{2}

) was heated with conc.

H C l

C l_{2}

evolved was passed through excess of

K I

solution. The iodine liberated required 40 mL of

\frac{N}{10}

hypo solution. Find the

%

M n O_{2}

in the pyrolusite (atomic mas of Mn = 55 amu).

480 g

K C l O_{3}

are dissoved in conc.

H C l

and the solution was boiled. Chlorine gas evolved in the reaction was then passed through a solution of

K I

and liberated iodine was titrated with

100 m L

12.3 m L

of same hypo solution required

24.6 m L

0.5 N

iodine for complete neutralization. Calculate % purity of

K C l O_{3}

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