Which of the following is an endothermic reaction ?
Correct answer: D. Both B. and C.
- A. Absorption of SO3 in 98% H2SO4
- B. C + H2O = CO + H2
- C. Thermal dissociation of iron pyrites
- D. Both B. and C.
Explanation
The water-gas reaction, C + H2O → CO + H2, requires heat, and thermal dissociation of iron pyrites is also endothermic. Absorption of SO3 in concentrated sulfuric acid is exothermic, so both B and C are correct.
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