Pick out the exothermic reaction out of the following ?
Correct answer: B. CaC2 + H2O = Ca(OH)2 + C2H2
- A. C + H2O = CO + H2
- B. CaC2 + H2O = Ca(OH)2 + C2H2
- C. MgCO3 = MgO + CO2
- D. All (A), B. and (C)
Explanation
The reaction of calcium carbide with water releases heat during formation of calcium hydroxide and acetylene. Water-gas formation and carbonate decomposition are endothermic, so option b is the exothermic reaction.
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