Question

In aqueous solutions, the Chromate ion can exist only under acidic conditions while the dichromate ion can exist only in neutral/alkaline conditions – True or false?

• A. True
• B. False

Answer 1

The correct option is B False

Depending on the pH of the solution, the chromate and dichromate ions could exist in equilibrium.
$2\left[Cr{O}_4{]}^{2-}\right(aq)+2H^{+}\rightleftharpoons [C{r}_2{O}_7{]}^{2-}\left(aq\right)+H_{2}O\left(l\right)$
As you can see from the above equilibrium, in aqueous solutions, the chromate ion can only prevail under neutral or basic conditions. On the other hand, the dichromate ion can only exist in acidic medium.