a)Al +PbCl2=AlCl3+ Pb
б)2Al+3H2SO4= Al2(SO4)3 +3H2
в)Al+3NaCl=AlCl3+3Na
2Cr + 3Cl2 = 2CrCl3
Co + Cl2= CoCl2
Ti + 2Cl2 = TiCl4
Ответ: в