Which of the following will dissolve at the fastest rate?

15g of sugar cubes in 120 g of water at 60 degrees C

15g of sugar cubes in 120 g of water at 20 degrees C

15g of granulated (crushed) sugar in 120 g of water at 50 degrees C

15 g of granulated (crushed) sugar in 120 g of water at 20 degrees C

15g of granulated (crushed) sugar in 120 g of water at 50 degrees C

Explanation:

the solute always dissolves faster when the area is increased and when the temperature is increased.

"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."

14,16 18 reacts with group