Which of the following is a combustion reaction? A. CaCO3 (s) → CaO (s) + O2 (g) B. C (s) + O2 (g) → CO2 (g) C. 2Na (s) + Cl2 (g) → 2NaCl (s) D. H2 (g) + Cl2 (g) → 2HCl (g)

1 Answer
Shubh
Apr 16, 2018

B.

Explanation:

Combustion is the process of heating an element in the presence of
Di-Oxygen to produce water#(H_2O)#, carbon di-oxide#(CO_2)# & Heat + Light.
so, #C(s)+O_2(g) rarr CO_2(g)# is taking place in the presence of oxygen & other equations are taking place in the absence of oxygen.
so, correct answer is B.

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