Помогите сделать 6 реакций ОВР

1)[tex]KMnO_{4}+KNO_{2}+H_{2}SO_{4}=MnSO_{4}+KNO_{3}+K_{2}SO_{4}+H_{2}O[/tex]

2)[tex]FeSO_{4}+KClO_{3}+H_{2}SO_{4}=Fe_{2}(SO_{4})_{3}+KCl+H_{2}O[/tex]

3)[tex]MnSO_{4}+PbO_{2}+HNO_{3}=HMnO_{4}+Pb(NO_{3})_{2}+PbSO_{4}+H2O[/tex]

4)[tex]FeSO_{4}+K_{2}Cr_{3}O_{7}+H_{2}SO_{4}=Fe_{2}(SO_{4})_{3}+Cr2(SO4)3[/tex]+[tex]K2SO4+H2O[/tex]

5)KMnO4+FeSO4+H2SO4=Fe2(SO4)3+MnSO4+K2SO4+H20

6)KMn04+H2S+H2SO4=K2SO4+MnSO4+S+H2O

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