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20 gm pyrolusite ore exactly requires 29...

20 gm pyrolusite ore exactly requires 29.2 gm HCl for complete reaction : `MnO_(2)+4HCl rarr MnCl_(2)+Cl_(2)+2H_(2)O`
The mass percent of pure `MnO_(2)` in the pyrolusite ore is (Mn = 55)

A

`17.4%`

B

`87%`

C

`43.5%`

D

`14.6%`

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