What is the common uses that technetium use??

It is used to image different body parts during medical scans.

Explanation:

Technetium is a remarkable corrosion inhibitor for steel and adding very small amount can provide excellent protection

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.