Final answer:
The correct formula for potassium dichromate is K₂Cr₂O₇, which dissociates into 2K+ and Cr₂O₇2- ions when dissolved in water.The correct option is b.
Step-by-step explanation:
The formula for potassium dichromate is K₂Cr₂O₇. When potassium dichromate is dissolved in water, it dissociates into the ions 2K+ (potassium ions) and Cr₂O₇2- (dichromate ions). The dissolution can be represented by the equation:
K₂Cr₂O₇(s) → 2K+(aq) + Cr₂O₇2-(aq)
This process forms a homogeneous orange solution wherein the solutes, potassium and dichromate ions, are individually dispersed among the water molecules.