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MHT CET Chemistry question

ChemistryThermodynamicsMHT CET

Given: ; kJ ...(i) ; kJ ...(ii) ; kJ ...(iii) Heat of formation of acetylene is

Answer: (C)

Solution

For 2C + H2 -> C2H2 take (i) + (ii) - (iii): = -767 - 266 + 1290 = +257 kJ; (a)

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Question ID VK-064492