What is Manganese dioxide?
{{chembox | Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 445299286 | ImageFile = Manganese(IV) oxide.jpg | ImageName = Manganese(IV) oxideMn4O2 | ImageFile1 = Rutile-unit-cell-3D-balls.png | ImageName1 = | IUPACName = Manganese oxide<br />Manganese(IV) oxide | OtherNames = [[Pyrolusite]], hyperoxide of manganese, black oxide of manganese, manganic oxide | Section1={{Chembox Identifiers | CASNo = 1313-13-9 | PubChem = 14801 | CASNo_Ref = {{cascite|correct|CAS}} | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} | ChemSpiderID = 14117 | ChEBI_Ref = {{ebicite|changed|EBI}} | ChEBI = 136511 | StdInChI_Ref = {{stdinchicite|correct|chemspider}} | StdInChI = 1S/Mn.2O | StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} | StdInChIKey = NUJOXMJBOLGQSY-UHFFFAOYSA-N | SMILES = O=[Mn]=O | EINECS = 215-202-6 | RTECS = OP0350000 }} |Section2={{Chembox Properties | Formula = {{chem|MnO|2}} | MolarMass = 86.9368 g/mol | Appearance = Brown-black solid | Density = 5.026 g/cm<sup>3</sup> | Solubility = insoluble | MeltingPtC = 535 | MeltingPt_notes = (decomposes) | MagSus = +2280.0·10<sup>−6</sup> cm<sup>3</sup>/mol }} |Section4={{Chembox Thermochemistry | DeltaHf = −520&nbsp;kJ·mol<sup>−1</sup><ref name=b1>{{cite book| author = Zumdahl, Steven S.|title =Chemical Principles 6th Ed.| url = https://archive.org/details/chemicalprincipl0000zumd_u9g0| publisher = Houghton Mifflin Company| year = 2009| isbn = 978-0-618-94690-7|page=A22}}</ref> | Entropy = 53&nbsp;J·mol<sup>−1</sup>·K<sup>−1</sup><ref name=b1/> }} |Section7={{Chembox Hazards | ExternalSDS = [http://www.inchem.org/documents/icsc/icsc/eics0175.htm ICSC 0175] | EUClass = Harmful ('''Xn''')<br />Oxidizer ('''O''') | RPhrases = {{R20/22}} | SPhrases = {{S2}}, {{S25}} | NFPA-H = 1 | NFPA-F = 1 | NFPA-R = 2 | NFPA-S = OX | FlashPtC = 535 }} |Section8={{Chembox Related | OtherAnions = [[Manganese disulfide]] | OtherCations = [[Technetium dioxide]]<br/>[[Rhenium dioxide]] | OtherFunction = [[Manganese(II) oxide]]<br/>[[Manganese(II,III) ox