1)ZnCl2->HCl->KCl->Cl2->I2->HI.
1.ZnCl2+H2S->ZnS+2HCl
2.HCl+KOH->KCl+H2O
3.KCl(электролиз)->K+Cl2
4.CL2 + 2Hi -> i2 + 2HCL
5.I2 + H2 -> 2Hi
2)HCl->AgCl
HCl + AgNO3 = AgCl + HNO3
3)H⁺¹N⁺⁵O3⁻²+Mg°->Mg⁺²(N⁺⁵O3⁻²)2⁻¹+N2⁺¹O⁻²+H⁺¹2O⁻²
B.Mg°-2e->Mg⁺² 4
8
O.2N⁺⁵+8e->N₂⁺¹ 1
10HNO3+4Mg->4Mg(NO3)2+N2O+5H2O