O₂______     H₂______      Mn______         Ba______
F₂______    He______     Pb______     Fe______
Cl₂______     Ne______     I₂______      Ar______
H₂O______ CaO______     CuO______    CO______
CO₂______  SO₂______       NO______     Na₂O______
N₂O₅______  Fe₂O₃______      FeO______    Fe₃O₄______
MgO______  Al₂O₃______      HgO______    Na₂O______
NaCl______  KCl______       CaCl₂______    MgCl₂______
AlCl₃______  ZnCl₂______     FeCl₂______    FeCl₃______
CuCl₂______  AgCl______     BaCl₂______    Fe₂S₃______
Na₂S______  FeS______      HCl______      H₂SO₄______
NaOH______  NaNO₃______   Na₂SO₄______   Na₂CO₃______
KOH______  KNO₃______      K₂SO₄______   K₂CO₃______
Ca（OH）₂______  Ca（NO₃）₂______ CaSO₄______   CaCO₃______
Al（OH）₃______  Al（NO₃）₃______  Al₂（SO₄）₃______ H₂CO₃______
Ba（OH）₂______  Ba（NO₃）₂______  BaSO₄______   BaCO₃______
Cu（OH）₂______  Cu（NO₃）₂______  CuSO₄______   NH₄Cl______
NH₄NO₃______      HNO₃______．

從Fe、H₂O、CO₂、NaOH、Fe（OH）₃、H₂SO₄、CuCl₂、BaCl₂、NaSO₄、MgSO₄、KMnO₄十一種物質(zhì)中，選出適當(dāng)?shù)奈镔|(zhì)（每種物質(zhì)只允許選用一次）按下述要求各寫出一個化學(xué)方程式：
（1）化合反應(yīng)______；
（2）分解反應(yīng)______ K₂MnO₄+MnO₂+O₂↑