Verified answer

1. KCr(SO4)2(aq) + 3 NH3(aq) + 3 H2O --------> Cr(OH)3(s) + (NH4)2SO4(aq) + KNH4SO4(aq)

2. KCr(SO4)2(aq) + 3 NaHCO3(aq) -------> Cr(OH)3(s) + 3 CO2(g) + NaKSO4(aq) + Na2SO4(aq)

3. 2 CrCl3(aq) + Zn(s) -------------> ZnCl2(aq) + 2 CrCl2(aq)

The equation as you've written it can't be balanced. There's no zinc on the left!