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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