How many moles HCl will be required to react with potassium heptaoxodichromate (VI) to produce 3 moles of chlorine?

A. 14
B. 12
C. 11
D. 10

Correct Answer:

Option A – 14

Explanation

K2Cr2O7 + HCl → Cl2 + KCl + CrCl3 + H2O

Balancing the equation, we have

K2Cr2O7 + 14HCl → 3Cl2 + 2KCl + 2CrCl3 + 7H2O