The enthalpy of hydrogenation of cyclohexene is −119.5 kJ mol−1. If resoance energy of benzene is -150 kJmol−1, its enthalpy of hydrogenation would be:
Held on 30 Apr 2006 · Verified 9 Jul 2026.
−358.5 kJ mol−1
−508.9 kJ mol−1
−208.1 kJ mol−1
−269.9 kJ mol−1
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For the reaction 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), ΔH = -198 kJ. Which condition favours forward reaction?
The unit of rate constant for a first-order reaction is:
The conjugate base of H₂SO₄ is:
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If the half-life $\left(\mathrm{t}_{1 / 2}\right)$ for a first order reaction is 1 minutes, then the time required for $99.9 \%$ completion of the reaction is closest to:
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