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

Explanation:

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

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 .

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.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.