See the following chemical reaction: Cr _ 2 O _ 7 ^ 2 - + XH ^ + + 6 Fe ^ 2 + → YCr ^ 3 + + 6 Fe ^ 3 + + ZH _ 2 O The sum of X, Y and Z is

Question

Quantrex Academy · Accepted Answer

Correct answer: 23

The given equation can be balanced using ion-electron method as shown below.

${Fe}^{2 +} \to {Fe}^{3 +} + {e}^{-}$ -oxidation Half reaction

$6{e}^{-} + 14{H}^{+} + {Cr}_{2}{O}_{7}^{2 -} \to 2{Cr}^{3 +} + 7{H}_{2}O$ -Reduction Half reaction

The overall reaction is

$6{Fe}^{2 +} + 14{H}^{+} + {Cr}_{2}{O}_{7}^{2 -} \to 6{Fe}^{3 +} + 2{Cr}^{3 +} + 7{H}_{2}O$

The values $X = 14, Y = 2andZ = 7$

$( X + Y + Z ) = 14 + 2 + 7$

$= 23$

See the following chemical reaction: Cr _ 2 O _ 7 ^ 2 - + XH ^ + +...