Respuesta :
Answer : The correct option is, (b) [tex]2Na^+[/tex]
Explanation :
Complete ionic equation : In complete ionic equation, all the substance that are strong electrolyte and present in an aqueous are represented in the form of ions.
Net ionic equation : In the net ionic equations, we are not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
The balanced molecular equation will be,
[tex]Na_2S(aq)+MgCl_2(aq)\rightarrow 2NaCl(aq)+MgS(s)[/tex]
The complete ionic equation in separated aqueous solution will be,
[tex]2Na^+(aq)+S^{2-}(aq)+Mg^{2+}(aq)+2Cl^{-}(aq)\rightarrow 2Na^+(aq)+2Cl^{-}(aq)+MgS(s)[/tex]
In this equation the species [tex]Na^+\text{ and }Cl^{-}[/tex] are the spectator ions.
Hence, the complete ionic equation contains specie is [tex]2Na^+[/tex]
