How many moles of silver sulfide are formed when 2 moles of silver is completely reacted
Ag(s)+S(s)->Ag2S(s)

The answer is not c

The question is incomplete. complete question is attached belowanswer: correct answer is option b  i.e.  solid particles  reason: filter paper has small pores, through which smaller particles can pass through. however, solid particles  have relatively larger size. hence, they are least likely to pass through.

Ican't see the chart but the density of both nickel and cobalt is 8.90 g/cm3, so it would be one of those.