When the equation MnO₂ + HCl → MnCl₂ + Cl₂ + H₂O is balanced, what is the coefficient of HCl?
Correct answer C. 4
Explanation
Mn falls from +4 to +2 while two Cl atoms rise to 0 in Cl₂. Balancing gives MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O.
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