Răspuns:
[tex]\bf1)\:\sf\underline{I_2^0} +H^{+1}\underline{\underline{N^{+5}}}O_3^{-2}\rightarrow H^{+1}\underline{I^{+5}} O_3^{-2}+\underline{\underline{N^{+2}}}O^{-2}+H_2^{+1}O^{-2}[/tex]
[tex]\sf I_2^0\xrightarrow{-10e^-}2I^{+5}|\cdot3\:\:\:oxidare[/tex]
[tex]\sf N^{+5}\xrightarrow{+3e^-}N^{+2}|\cdot10\:\:\:reducere[/tex]
I₂ → caracter reducător
HNO₃ → caracter oxidant
[tex]\bf2)\:\sf\underline{V_2^{+5}}O_5^{-2}+\underline{\underline{Al^0}}\rightarrow\underline{V^0}+\underline{\underline{Al_2^{+3}}}O_3^{-2}[/tex]
[tex]\sf V^{+5}\xrightarrow{+5e^-}V^0|\cdot3\:\:\:reducere[/tex]
[tex]\sf Al^{0}\xrightarrow{-3e^-}Al^{+3}|\cdot5\:\:\:oxidare[/tex]
V₂O₅ → caracter reducător
Al → caracter oxidant
[tex]\bf3)\:\sf\underline{S^0}+H^{+1}\underline{\underline{N^{+5}}}O_3^{-2}\rightarrow H_2^{+1}\underline{S^{+6}}O_4^{-2}+\underline{\underline{N^{+2}}}O^{-2}[/tex]
[tex]\sf S^0\xrightarrow{-6e^-}S^{+6}|\cdot3\!\!\!/\:\:1\:\:\:oxidare[/tex]
[tex]\sf N^{+5}\xrightarrow{+3e^-}N^{+2}|\cdot6\!\!\!/\:\:2\:\:\:reducere[/tex]
S → caracter reducător
HNO₃ → caracter oxidant
[tex]\bf4)\:\sf\underline{I_2^0}+\underline{\underline{Cl_2^0}} +H_2^{+1}O^{-2}\rightarrow H^{+1}\underline{I^{+5}}O_3^{-2}+H^{+1}\underline{\underline{Cl^{-1}}}[/tex]
[tex]\sf I_2^0\xrightarrow{-10e^-}2I^{+5}|\cdot2\!\!\!/\:\:1\:\:\:oxidare[/tex]
[tex]\sf Cl_2^0\xrightarrow{+2e^-}2Cl^{-1}|\cdot10\!\!\!/\:\:5\:\:\:reducere[/tex]
I₂ → caracter reducător
Cl₂ → caracter oxidant
Succes! <3