Answer:
b. 1 and 3
Explanation:
1. [tex]Na^{+} and \ Cl^{-}[/tex] .NaCL is formed by ions.
2. C6H12O6 has only covalent bonds.
3. (NH4)2CO3 is formed by ions [tex]NH_4^{+} \ and \ CO_{3}^{2-}[/tex].
