Question

co(no3)2+Al

co(no3)2+Сr

Answer 1

2Al + 3Hg(NO3)2 = 2Al(NO3)3 + 3Hg

Mg + ZnCl2=MgCl2 + Zn

Fe + ZnCl2 = FeCl2 + Zn

Pb(NO3)2 + Zn = Pb↓ + Zn(NO3)2

 

Answer 2

3Co(NO3)2 + 2Al ---> 2Al(NO3)3 + 3Co
Co(NO3)2 + Cr -----> Cr(NO3)2 + Co