Question

                    Alkali
Cr(OH)₃+H₂O₂⇒CrO₄⁻²+H₂O THE number of OH⁻ required to balance the equation is

alkali i wrote it there bcz it means in presence of

Answer 1

$Cr(OH)_{3} + H_{2} O_{2} --------->Cr O_{4} ^{2-} + H_{2}O$
on balancing the equation in the basic medium
balanced equation is:
$Cr(OH)_{3} + 4 H_{2} O_{2} --------->Cr O_{4} ^{2-} + 4 H_{2}O + 3 OH^{-}$
so three $OH^{-}$ is required to balance the equation.