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MCQMediumJEE Main 2023 · 10 April, Shift 1Hess's Law

Chemistry Question from JEE Main 2023 · 10 April, Shift 1

Given:

(A) 2CO(g)+O2(g)→2CO2(g)2CO(\text{g}) + O_2(\text{g}) \rightarrow 2CO_2(\text{g}), ΔH1∘=−x kJ mol−1\Delta H_1^\circ = -x \, \text{kJ mol}^{-1}

(B) C(graphite)+O2(g)→CO2(g)C(\text{graphite}) + O_2(\text{g}) \rightarrow CO_2(\text{g}), ΔH2∘=−y kJ mol−1\Delta H_2^\circ = -y \, \text{kJ mol}^{-1}

The ΔH∘\Delta H^\circ for the reaction C(graphite)+12O2(g)→CO(g)C(\text{graphite}) + \frac{1}{2}O_2(\text{g}) \rightarrow CO(\text{g}) is:

  • A

    (x−2y)/2(x - 2y)/2

  • B

    (x+2y)/2(x + 2y)/2

  • C

    (2x−y)/2(2x - y)/2

  • D

    (2y−x)(2y - x)

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