Question

Hi can any body explain to me how to get the ans .thx:)

3. EXTENDED Work out the chemical formulae of the following
compounds:
a) a compound containing Zn2+ ions and Ci- ions
b) a compound containing Cr3+ ions and O2-ions
c) a compound containing Fe2+ and OH-ions.

Answer 1

a)ZnCl2

b)Cr2O3

FeOH2

Step-by-step explanation:

they just exchange valencies