alleryWhite manganese hydroxide turns brown on standing in air. Why?
AIt forms manganese sulphide
BIt reacts with excess NaOH
CIt oxidises to hydrated MnO2
DIt loses water to give MnO
Answer & Solution
Correct answer: C. It oxidises to hydrated MnO2
Atmospheric oxygen oxidises Mn(OH)2 to brown hydrated manganese dioxide.
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