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JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry

\(\mathrm{A}_2+\mathrm{B}_2 \rightarrow 2 \mathrm{AB} \cdot \Delta \mathrm{H}_{\mathrm{f}}^0=-200 \mathrm{kJmol}^{-1}\) \(\mathrm{AB}, \mathrm{A}_2\) तथा \(\mathrm{B}_2\) द्विपरमाण्विक अणु है। यदि \(\mathrm{A}_2\), \(\mathrm{B}_2\) तथा \(\mathrm{AB}\) की आबन्ध एन्थैल्पीयाँ \(1: 0.5: 1\) अनुपात में हैं तो \(\mathrm{A}_2\) की आबन्ध एन्थैल्पी_____________\(\mathrm{kJmol}^{-1}\) होगी (निकटतम पूर्णाक में)

  1. A \(600\)
  2. B \(200\)
  3. C \(800\)
  4. D \(500\)
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Answer & Solution

Correct Answer

(C) \(800\)

Step-by-step Solution

Detailed explanation

\(A _2+ B _2 \rightarrow 2 AB ; \Delta H _{ r }^0=-200\,kJ\,mol ^{-1}\) \(\Rightarrow \Delta H _{ p }^0( AB )=-200\,kJ\,mol\,m ^{-1}\) \(\therefore \Delta H _{ R }^0\) for reaction \(A _2+ B _2 \rightarrow 2 AB\) is \(-400\,kJ\,mol ^{-1}\) Given: Bond Enthalpy of \(A _2, B _2\)…
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