Which one of the following reactions is NOT balanced?
A) 2 CO + O2 → 2 CO2
B) 2 SO2 + O2 → 2 SO3
C) 2 KNO3 + 10 K → 5 K2O + N2
D) SF4 + 3 H2O → H2SO3 + 4 HF
Correct Answer:
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