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CSS Solved Papers
Physics Chemistry

Engineering :: Chemical Technology

  Which of the following reactions is an exothermic reaction?
[A]. CaCO3(s) ? CaO(s) + CO2(g)[B]. CaO(s) + H2O(I) ? Ca(OH)2(s)
[C]. 2NaHCO3 (s) ? Na2CO3(s) + CO2(g) + H2O(g)[D]. C(s) + O2 (g) ? CO2(g)

Answer: Option D
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