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JEE Mains Model Paper 12

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Question : 65 of 90
 
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The molar enthalpies of combustions of C2H2 (g) , C (graphite) & H2 (g) are - 1300 , - 394 & - 286 KJmol−1 respectively. The standard enthalpy of formation of C2H2 (g) is
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