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Lead dioxide
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<p>Lead(IV) oxide, commonly known as lead dioxide, is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">chemical formula</a> PbO2. It is an <a href="/facts/Oxide/DXtoVe1C">oxide</a> where <a href="/facts/Lead/EYljasJN">lead</a> is in an <a href="/facts/Oxidation_state/W53W6s6V">oxidation state</a> of +4. It is a dark-brown solid which is insoluble in water. It exists in two crystalline forms. It has several important applications in <a href="/facts/Electrochemistry/C0RUWpBH">electrochemistry</a>, in particular as the positive plate of <a href="/facts/Lead_acid_battery/84b8hALA">lead acid batteries</a>. </p>