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Pyrolusite: Quiz


Question 1: It also occurs in ________ and often results from alteration of manganite.
PeatUnited KingdomBogEngland

Question 2: This article incorporates text from the Encyclopædia Britannica, Eleventh Edition, a publication now in the ________.
Public domainCopyrightCopyright infringementIntellectual property

Question 3: Pyrolusite is a mineral consisting essentially of ________ (MnO2) and is important as an ore of manganese.
Manganese(II) sulfatePotassium permanganateHydrogen peroxideManganese dioxide

Question 4: Pyrolusite occurs associated with manganite, hollandite, hausmannite, braunite, chalcophanite, goethite and ________ under oxidizing conditions in hydrothermal deposits.

Question 5: When mixed with molten glass it oxidizes the ferrous ________ to ferric iron, and so discharges the green and brown tints (making it classically useful to glassmakers as a decolorizer).

Question 6: The metal is obtained by reduction of the oxide with sodium, magnesium, ________, or by electrolysis.

Question 7: As an oxidizing agent it is used in the preparation of chlorine; indeed, chlorine gas itself was first described by ________ in 1774 from the reaction products of pyrolusite and hydrochloric acid.
BariumOxygenManganeseCarl Wilhelm Scheele

Question 8: Pyrolusite is extensively used for the manufacture of spiegeleisen and ferromanganese and of various alloys such as manganese-________.


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