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Ores and Minerals

62. An impure...

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62. An impure sample of pyrolusite are (MnO2) consist of 70% MnO2, 20% inert gases and rest is moisture.On strong heating all MnO2 is converted into MnO along with formation of O2.The % of Mn in dried sample is

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M n O_{2}

on ignition converts into

M n_{3} O_{4}

. A sample of pyrolusite having

75 % M n O_{2}, 20 %

inert impurities and rest water is ignited in air to constant weight. What is the percentage of

M n

in the ignited sample?

M n O_{2}

in air converts it quantitatively to

{M n}_{3} O_{4}

. A sample of pyrolusite has

80 %

M n O_{2}

15 %

S i O_{2}

and the rest is water. The sample is heated in air to a constant mass. The

%

M n

in the ignited sample is (as the nearest integer)

Q. Pyrolusite in

M n O_{2}

is used to prepare

K M n O_{4}

M n O_{2} I \to M n O_{4}^{2 -} + M n O_{4}^{-}

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).

Q. Pyrolusite in

M n O_{2}

is used to prepare

K M n O_{4}

M n O_{2} I ⟶ M n O_{4}^{2 -} I I ⟶ M n O_{4}^{-}

.

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