D And F Block Elements

A purple coloured compound of manganese \((X)\) decomposes on heating to liberate oxygen and forms compounds of manganese \(Y\) and \(Z\). Compound \(Z\) reacts with \(\mathrm{KOH}\) in presence of potassium nitrate to give compound \(Y\). Compounds \(X, Y\) and \(Z\) respectively are