Question

dissolving potassium dichromate (k₂cr₂o₇) in water results in a solution of aqueous potassium ions and aqueous chromate ions.
cloudy
2:7
2:1
heterogeneous

Explanation:

Potassium dichromate ($K_2Cr_2O_7$) dissociates in water as $K_2Cr_2O_7(s)
ightarrow 2K^+(aq)+Cr_2O_7^{2 - }(aq)$. The ratio of potassium ions ($K^+$) to dichromate ions ($Cr_2O_7^{2 - }$) is 2:1. The solution formed is homogeneous, not cloudy or heterogeneous. The 2:7 ratio is incorrect for the ion - ratio in this dissociation.

Answer:

C. 2:1