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Answer:
Option 3 is the correct answer.
Explanation:
MnO2 + HCl → MnCl2 + 2H2O + Cl2
Balancing the equation,
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
HCl is oxidized to Cl2 and
MnO2 is reduced to MnCl2
Stoichiometric coefficient of HCl is 4 and
Stoichiometric coefficient of MnO2 is 1
∴ Ratio of substance oxidized to substance reduced is 4 : 1