13. what salt results from the neutralization of phosphoric acid with potassium hydroxide?

Answer : The salt produced in this reaction is potassium phosphate.

Explanation :

Neutralization reaction : It is a type of reaction in which an acid react with a base to give a salt and water as a product.

As per question, when phosphoric acid react with potassium hydroxide base then it gives potassium phosphate and water as a product.

The balanced chemical reaction will be,

From this we conclude that, the salt produced in this reaction is potassium phosphate.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."