(, i need some )
when potassium nitrate is dissolved in water to a cooling notes . one can then conclude that:
a) the solubility of the salt increases with temperature .
b ) the salt is poorly dissociated in water.
c ) the salt solubility decreases with temperature .
d ) the salt dissociated in water is very
e) there is a lowering of the freezing point of water.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.