2. Make a summary equation for each reaction, equalize them and indicate the oxidizing agent and reducing agent:
Na2S K2Cr2O7 H2SO4 → S Cr2(SO4)3 Na2SO4 K2SO4 H2O
CuI2 → CuI I2
If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.