Question

С2СrO7+...+H2SO4=I2+...+...+... ОВР

Answer 1

K2Cr2O7 + 6KI + 7H2SO4 = 3I2 + Cr2(SO4)3 + 4K2SO4 + 7H2O
Cr(6+) + 3e(-) --> Cr(3+) 2
2I(-) - 2e(-) --> I2(0) 3