Answer:
[tex]$ CaCl_2$[/tex], CaS, [tex]$ Cr Cl_4$[/tex], [tex]$ CrS_2$[/tex]
Explanation:
The reaction can be done by adding the cations and the anions.
The binary compounds are always formed by the two different elements.
When one calcium ion, [tex]$ Ca ^{2+} $[/tex] combines with the two calcium ions, [tex]$ Cl^-$[/tex], they formed a binary compound of [tex]$ CaCl_2$[/tex].
When one [tex]$ Ca ^{2+} $[/tex] combines with one [tex]$S^{2-}$[/tex] ion, they formed CaS binary compound.
When one chromium ion [tex]$ Cr^{4+}$[/tex] combines with four ions of chlorine, [tex]$ Cl ^- $[/tex], the compound formed is [tex]$ Cr Cl_4$[/tex].
When 1 ion of [tex]$ Cr^{4+}$[/tex] combines with 2 ions of sulphur, [tex]$S^2$[/tex], the binary compound formed is [tex]$ CrS_2$[/tex].
