Đáp án : a. 2HCL = H2 + CL2 , 3CL2 +2FE = 2 FECL3 , 3NAOH + FECL3 = 3 NACL + FE(OH)3 , H2SO4 + NACL = HCL +NAHSO4 , CUO + 2HCL = 2H2O + CUCL2 , 2NAOH + CUCL2 = CU(OH)2 + 2 NACL
b. 2HCl = H2 + CL2 , CL2 + 2 NA = 2NACL , H2SO4 + NACL = HCL + NAHSO4 , FE + 2HCL = FECL2 + H2
c. 4HCL + MNO2 = CL2 + 2H2O + MNCL2 , CL2 + 2 KI = I2 + 2KCL , H2SO4 + 2KCL = 2HCL + K2SO4 , 2HCL = H2 + CL2 , CL2 + NABR = 2NACL + BR2 , BR2 + 2NAI = I2 + 2 NABR
d, 4H2SO4 + 2KCL + 4KMNO4 = CL2 + 4H2O + 4MNSO4 + 3K2SO4 , CL2 + C3H8 = HCL + C3H7CL , FE2O3 + 6HCL = 3H2O + 2FECL3 , 3AGNO3 + FECL3 = 3AGCL + FE(NO3)3