JAMB Chemistry 2008 Objective — Question 27

Question 27 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2008 Objective paper, with the correct answer and a full explanation.

Which of the following reactions is endothermic? A. C(s)+O2(g)->CO2(g) B. CaO(s)+H2O(l)->Ca(OH)2(s) C. H2O->CO(g) D. HCl(g)+NaOH(aq)->NaCl(aq)+H2O(l)

A. C(s)+O2(g)->CO2(g)
B. CaO(s)+H2O(l)->Ca(OH)2(s)
C. H2O(l)+CO(g)->H2(g)+H2O(g)Correct
D. HCl(g)+NaOH(aq)->NaCl(aq)+H2O(l)

Explanation

C(s)+O2(g)->CO2 (exothermic); CaO(s)+H2O(l)->Ca(OH)2(s) (exothermic); HCl(aq)+NaOH(aq)->NaCl(aq)+H2O(l) (exothermic); H2O->CO(g)+H2(g) is the endothermic reaction.

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