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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
Enthalpy of formation is just a special case of enthalpy of reaction. Then Which of the following enthalpy of reaction is not same as enthalpy of formation?
  • ✓
    $CaO(s) + C{O_{2(g)}} \to CaC{O_{3(s)}}$
  • B
    $C{a_{(s)}} + \frac{3}{2}{O_2}(g) + {C_{{\rm{grap}}}} \to CaC{O_{3(s)}}$
  • C
    ${H_2}(g) + {S_{{\rm{rhombic}}}} + 2{O_{2(g)}} \to {H_2}S{O_4}(l)$
  • D
    $6{C_{{\rm{(grap)}}}} + 6{H_2}(g) + 3{O_2}(g) \to {C_6}{H_{12}}{O_6}(s)$
✓

Answer

Correct option: A.
$CaO(s) + C{O_{2(g)}} \to CaC{O_{3(s)}}$
a

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