$26)$

$\text{ x 5 | }$$\mathop{Fe^{2+}}\limits^{} \to \mathop{Fe^{3+}}\limits^{}+1e^-$

$\text{ x 1 | }$$8H^++\mathop{Mn}\limits^{+7}O_4^{-}+5e^- \to \mathop{Mn^{2+}}\limits^{}+4H_2O$

`->`$5Fe^{2+} +8H^++MnO_4^{-} + \to 5Fe^{3+}+Mn^{2+}+4H_2O$

`->`$5FeSO_4+4H_2SO_4 +KMnO_4 \to \dfrac{5}{2}Fe_2(SO_4)_3+MnSO_4+\dfrac{1}{2}K_2SO_4+4H_2O$

`->`$10FeSO_4+8H_2SO_4 +2KMnO_4 \to 5Fe_2(SO_4)_3+2MnSO_4+2K_2SO_4+8H_2O$

$27)$

$\text{ x 6 | }$$\mathop{Fe^{2+}}\limits^{} \to \mathop{Fe^{3+}}\limits^{}+1e^-$

$\text{ x 1 | }$$14H^++\mathop{Cr_2}\limits^{+6}O_7^{2-}+6e^- \to \mathop{2Cr^{3+}}\limits^{}+7H_2O$

`->`$6Fe^{2+} +14H^++Cr_2O_7^{2-} + \to 6Fe^{3+}+Cr^{3+}+7H_2O$

`->`$6FeSO_4+7H_2SO_4 +K_2Cr_2O_7 \to 3Fe_2(SO_4)_3+Cr_2(SO_4)_3+K_2SO_4+7H_2O$

$28)$

$\text{ x 1 | }$$\mathop{2Cl^-}\limits^{} \to \mathop{Cl_2}\limits^{0}+2e^-$

$\text{ x 1 | }$$4H^++\mathop{Mn}\limits^{+4}O_2+2e^- \to \mathop{Mn^{2+}}\limits^{}+2H_2O$

`->`$2Cl^-+4H^++MnO_2 \to Cl_2+Mn^{2+}+2H_2O$

`->`$MnO_2+4HCl \to Cl_2+MnCl_2+2H_2O$

$29)$

$\text{ x 5 | }$$\mathop{2Cl^-}\limits^{} \to \mathop{Cl_2}\limits^{0}+2e^-$

$\text{ x 2 | }$$8H^++\mathop{Mn}\limits^{+7}O_4^-+5e^- \to \mathop{Mn^{2+}}\limits^{}+4H_2O$

`->`$10Cl^-+16H^++2MnO_4^- \to 5Cl_2+2Mn^{2+}+8H_2O$

`->`$2KMnO_4+16HCl \to 2KCl+5Cl_2+2MnCl_2+8H_2O$

$30)$

$\text{ x 3 | }$$\mathop{2Cl^{-}}\limits^{} \to \mathop{Cl_2}\limits^{0}+2e^-$

$\text{ x 1 | }$$14H^++\mathop{Cr_2}\limits^{+6}O_7^{2-}+6e^- \to \mathop{2Cr^{3+}}\limits^{}+7H_2O$

`->`$6Cl^-+14H^++Cr_2O_7^{2-} \to 3Cl_2+2Cr^{3+}+7H_2O$

`->`$14HCl+K_2Cr_2O_7 \to 3Cl_2+2KCl+2CrCl_3+7H_2O$

$31)$

$\text{ x 5 | }$$\mathop{2Cl^{-}}\limits^{} \to \mathop{Cl_2}\limits^{0}+2e^-$

$\text{ x 1 | }$$12H^++\mathop{2Cl}\limits^{+5}O_3^{-}+10e^- \to \mathop{Cl_2}\limits^{0}+6H_2O$

`->`$10Cl^-+12H^++2ClO_3^- \to 6Cl_2+6H_2O$

`->`$5Cl^-+6H^++ClO_3^- \to 3Cl_2+3H_2O$

`=>`$6HCl+KClO_3 \to 3Cl_2+3H_2O$

$32)$

$\text{ x 5 | }$$H_2O+\mathop{N}\limits^{+3}O_2^- \to \mathop{N}\limits^{+5}O_3^-+2e^-+2H^+$

$\text{ x 2 | }$$8H^++\mathop{Mn}\limits^{+7}O_4^-+5e^- \to \mathop{Mn^{2+}}\limits^{}+4H_2O$

`->`$5NO_2^-+6H^+ 2MnO_4^- \to 5NO_3^-+3H_2O+Mn^{2+}$ 

`->`$5KNO_2+3H_2SO_4+2KMnO_4 \to 5KNO_3+3H_2O+2MnSO_4+K_2SO_4$