Question

An aqueous solution of sodium sulfide is allowed to react with an aqueous solution of magnesium chloride.

Answer 1

Answer : The correct option is, (b) $2Na^+$

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,

$Na_2S(aq)+MgCl_2(aq)\rightarrow 2NaCl(aq)+MgS(s)$

The complete ionic equation in separated aqueous solution will be,

$2Na^+(aq)+S^{2-}(aq)+Mg^{2+}(aq)+2Cl^{-}(aq)\rightarrow 2Na^+(aq)+2Cl^{-}(aq)+MgS(s)$

In this equation the species $Na^+\text{ and }Cl^{-}$ are the spectator ions.

Hence, the complete ionic equation contains specie is $2Na^+$