Question

Which of the following is not a correct chemical equation for a double displacement reaction? (2 points) 2RbNO3 + BeF2yields Be(NO3)2 + 2RbF CaCl + LiCO3yields CaCO3 + LiCl Na3PO4 + 3KOH yields 3NaOH + K3PO4 2MgI2 + Mn(SO3)2yields 2MgSO3 + MnI4

Answer 1

Answer: $2MgI_2+Mn(SO_3)_2\rightarrow 2MgSO_3+MnI_4$

Explanation:

Double displacement reaction: it is a chemical reaction in which the reactants  exchanges their ions to form new compounds as a products.

$AB+CD\rightarrow AD+CB$

All the reaction are example of double displacement reaction beside reaction where magnesium iodide is reacting with manganese(II) sulfate to give magnesium sulfate and manganese(IV) iodide .

$2MgI_2+Mn(SO_3)_2\rightarrow 2MgSO_3+MnI_4$

In this reaction , charge on manganese have changed from 2+ to 4+.  Manganese in getting oxidized. Example of an oxidation reaction. Hence, this reaction is not an example of double displacement reaction.