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Finkelstein Reaction

10g of Mno2 o...

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10g of Mno2 on reaction with HCL forms 2.24L of Cl2(g) at NTP,find the percentage impurity of Mno2.

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10 g

M n O_{2}

on reaction with HCI forms

2.24 L

{C I_{2}}_{(g)}

at NTP, the percentage impurity of

M n O_{2}

M n O_{2} + 4 H C I \to M n C I_{2} + C I_{2} + 2 H_{2} O

M n O_{2} + 4 H C l \to 2 H_{2} O + M n {C l}_{2} + {C l}_{2}

The reaction of

M n O_{2}

H C l

2.24 L

{C l}_{2}

gas. What mass of

M n O_{2}

was used up by the reaction? (At. mass of

M n = 55 g / m o l

)

10

M n O_{2}

on reaction with conc.

H C l

0.1

C l_{2}

(molecular weight of

M n = 55

g/mol). Hence, percentage purity of

M n O_{2}

Q. Assertion :One equivalent of

M n O_{2}

reacts with 2 equivalents of

H C l

in the reaction,

M n O_{2} + 4 H C l ⟶ M n C l_{2} + 2 H_{2} O + C l_{2}

. Reason: One equivalent of

M n O_{2}

reacts with one equivalent of

H C l

.

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 :

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