Question

$Cr{O}_3$ dissolves in aqueous $NaOH$ to give:

• A. $C{r}_2{O}_7^{2-}$
• B. $Cr{O}_4^{2-}$
• C. $Cr(OH{)}_3$
• D. $Cr(OH{)}_2$

Answer 1

The correct option is B $Cr{O}_4^{2-}$

$Cr{O}_3+2NaOH\to N{a}_{2}Cr{O}_4+H_{2}O$
In basic medium $Cr\left(VI\right)$ forms chromate ion.