Question

$CrO _{3}$ dissolves in aqueous $NaOH$ to give

• A. $ CrO_{4}^{2-} $
• B. $ Cr(OH)_{3}^{-} $
• C. $ Cr_{2}O_{7}^{2-} $
• D. $ Cr(OH)_{2} $

Answer 1

Answer: (A)

$CrO _{3}$ dissolves in aqueous $NaOH$ to give sodium chromate.
$CrO _{3}+2 NaOH \rightarrow \underset{\text { sodium chromate }}{ Na _{2} CrO _{4}}+ H _{2} O$