Which of the following equations represents a reaction which produces an effervescence?
A) 2H2 + O2 → 2H2O
B) N2 + 3H2→ 2NH3
C) 2Ca(NO3)2 → 2CaO + 4NO2 +O2
D) 2K + 2H2O → 2KOH + H2
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all equations are correct
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