12. which cation forms an insoluble chloride and an insoluble sulfide?

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.