B) as a base is no longer neutral or acidic, so it is an error
<h2>Double displacement reaction:</h2>
A double displacement reaction is a type of chemical reaction where two compounds react, and positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products.
<h3>For example:</h3>
Na2S+2HCl→2NaCl+H2S
hope it's helpful :)
The answer to this question would be B. hydrogen.
Two polar molecules can make hydrogen bond which was found in many polar molecules.
One example of hydrogen bond would be in the water. Water is a polar molecule with a positive end at the hydrogen side. Hydrogen bond in water is formed by molecule to molecule bond that looks like tetrahedral.
A Lewis base is characterized as any species that can donate a lone pair of electrons the Lewis acid (which has a vacant orbital for the lone pair to bond with)