Chemical Thermodynamics Question 176

Question: Which of the following is an example of endothermic reaction [MP PMT 1980]

Options:

A) $ C_2H_2+2H_2\to C_2H_6;\Delta E=-314.0,kJ $

B) $ C+O_2\to CO_2;\Delta E=-393.5,kJ $

C) $ N_2+O_2\to 2NO;\Delta E-180.5,kJ $

D) $ 2H_2+O_2\to 2H_2O;\Delta E+571.8,kJ $

Show Answer

Answer:

Correct Answer: C

Solution:

Heats of combustions are always exothermic except oxidation of N as, $ N_2+\frac{1}{2}O_2\to N_2O $

$ \Delta H=+,ve $

$ N_2+O_2,\to 2NO $

$ \Delta H=+,ve $



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