Samantha added 125 mL of water to 100mL of a stock solution to make 225 mL of a 0.75 M Solution. The Concentration of the original stock solution will be __ than that of the mixed solution.

A. Greater than

B. Less than

C. Equal to

A.Greater than

Explanation:

According to the neutralization law,

where,

= molarity of stock  solution = ?

= volume of stock  solution = 100 ml

= molarity of dilute solution = 0.75 M

= volume of dilute solution = 225 ml

Thus Concentration of the original stock solution will be greater than that of the mixed solution.

"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."

the answer is minerals.