9701/11 Chemistry May Jun 2023 Online Test | Cambridge AS and A Level MCQ
$The{\text{ }}ore{\text{ }}psilomelane{\text{ }}may{\text{ }}be{\text{ }}considered{\text{ }}to{\text{ }}have{\text{ }}the{\text{ }}general{\text{ }}formula{\text{ }}Ba\left( {M{n^{x + }}} \right){\left( {M{n^{y + }}} \right)_8}{O_{16}}{\left( {OH} \right)_4}{\text{ }}.{\text{ }}$
$In{\text{ }}this{\text{ }}general{\text{ }}formula,{\text{ }}{x^ + }{\text{ }}and{\text{ }}{y^ + }{\text{ }}are{\text{ }}the{\text{ }}two{\text{ }}different{\text{ }}oxidation{\text{ }}states{\text{…