Question

The oxide, $Cr{O}_3$ dissolves in water to produce a strongly acidic solution to form orange coloured solution. Solution changes to different on making it alkaline. What is the different color ?

• A. Pink
• B. White
• C. Yellow
• D. Green

Answer 1

Answer: (C)

Yellow

$2Cr{O}_3+H_{2}O\to C{r}_2{O}_7^{2-}+2H^{+}$, ---- orange colored solution

$C{r}_2{O}_7^{2-}+2O{H}^{-}\to 2Cr{O}_4^{2-}$ ----- yellow colored solution