Achromate ion consists of four oxygen atoms bonded to a chromium atom. it has two extra electrons. the formula of this ion:

cr4o2–

cro42+

cro42– (this one is correct by the way)

The correct answer is

Explanation:

Chromate ion is formed by the combination of one chromium atom and four oxygen atoms. The ion formed has two more electrons.

An ion which has extra electrons carries a negative charge on them and the ion which has more electrons carries a positive charge on them.

As, chromate ions have 2 extra electrons, Thus, it carries a charge of -2.

Hence, the correct answer is

the answer is definitely c.

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .