Two chemicals at room temperature (about 23°c) were combined in a flask. at first, there were bubbles. then, white flakes appeared at the bottom of the flask. after five minutes, the temperature of the solution was 33°c. a portion of the solution was used to measure its density and boiling point, which were determined to be 4.5 g/l and 82°c,

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.

the answer is d. 74.02