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  3. Chemistry
  4. 2C+O2 xrightarrow2CO; Δ H=220kJ Which of the following statement is correct for this reaction?

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Q. $ 2C+{{O}_{2}}\xrightarrow{{}}2CO;\,\Delta H=220kJ $ Which of the following statement is correct for this reaction?

BVP MedicalBVP Medical 2004

Solution:

$ 2C+{{O}_{2}}\xrightarrow{{}}2CO;\,\,\Delta H=-220kJ $ This reaction does not represent complete combustion of carbon, hence heat of combustion of carbon will not be equal to 110 kJ. The negative sign of $ \Delta H $ indicates that this reaction is exothermic. Also, despite being spontaneous reaction, it requires initiation.