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JEE Main202313 Apr 2023Evening ShiftChemistryRedox ReactionsActual

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

Correct answer

23

Step-by-step solution

The given equation can be balanced using ion-electron method as shown below. Fe 2 + → Fe 3 + + e - -oxidation Half reaction 6 e - + 14 H + + Cr 2 O 7 2 - → 2 Cr 3 + + 7 H 2 O -Reduction Half reaction The overall reaction is 6 Fe 2 + + 14 H + + Cr 2 O 7 2 - → 6 Fe 3 + + 2 Cr 3 + + 7 H 2 O The values X = 14 , Y = 2   and   Z   =   7 ( X +   Y   + Z )     =   14   +   2   + 7 =   23

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