1) a
*(NH4)2Cr2O7= N2+Cr2O3+H2O
*Cr2O3+AI= Cr+AI2O3
* 2Cr+3CI2= 2CrCI3
*CrCI3+3NaOH(конц.)=Сr(OH)3+3NaCI
Б
*Cr(NO3)3 + 2 Br2 + 8 KOH = KCrO4 + 4 KBr + 3 KNO3 + 4 H2O
B
*CrCl3+Na2CO3=CrCO3+NaCl
Г
*K2Cr2O7 + 2KOH → 2K2CrO4 + H2O
2)A
*K2Cr2O7 + 3SnSO4 + 7H2SO4 = Cr2(SO4)3 + 3Sn(SO4)2 + K2SO4 + 7H2O
*K2Cr2O7 + H2O+ 3(NH4)2S = 3S + 2Cr(OH)3 + 2KOH + 6NH3
*6FeCl2 + 14HCl + K2Cr2O7 = 6FeCl3 + 2CrCl3 + 2KCl + 7H2O