Which of the following reactions is endothermic in nature?Only one correct answerA.3MnO2(s) + 4Al(s) → 3Mn(l) + 2Al2O3(s)B.Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g)C.2NaHCO3(s) → Na2CO3(s) + H2O(g) + CO2(g)D.2NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + 2H2O(l)
Question
Which of the following reactions is endothermic in nature?Only one correct answerA.3MnO2(s) + 4Al(s) → 3Mn(l) + 2Al2O3(s)B.Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g)C.2NaHCO3(s) → Na2CO3(s) + H2O(g) + CO2(g)D.2NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + 2H2O(l)
Solution
The endothermic reaction is the one that absorbs heat from the surroundings. In the given options, the reaction C.2NaHCO3(s) → Na2CO3(s) + H2O(g) + CO2(g) is endothermic in nature. This is because the decomposition of Sodium bicarbonate (NaHCO3) into Sodium carbonate (Na2CO3), water (H2O), and carbon dioxide (CO2) requires heat to proceed, thus absorbing heat from its surroundings.
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