Question

The values of coefficients to balance the following reaction are

$Cr(OH)_{3} + ClO^{-} + OH^{-} \rightarrow CrO_{4}^{2 -} + Cl^{-} + H_{2}O$

$Cr(OH)_{3}$ $ClO^{-}$ $CrO_{4}^{2 -}$ $Cl^{-}$

• A. 2 3 3 3
• B. 2 4 3 2
• C. 2 4 4 2
• D. 2 3 2 3

Answer 1

Answer: (D)

2 3 2 3

Answer 2

:

& Cr(OH)_{3} + 5OH^{-} \rightarrow CrO_{4}^{2 -} + 4H_{2}O + 3e^{-}\rbrack \times 2 \\ & ClO^{-} + H_{2}O + 2e^{-} \rightarrow Cl^{-} + 2OH^{-}\rbrack \times 3 \end{aligned}} }\underline{\begin{aligned} & 2Cr(OH)_{3} + 4OH^{-} + 3ClO^{-} \rightarrow 2CrO_{4}^{2 -} + \\ & 3Cl^{-} + 5H_{2}O \end{aligned}}$$