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

अभिक्रिया \(MgO ( s )+ C ( s ) \rightarrow Mg ( s )+ CO ( g )\) जिसका \(\Delta_{ r } H ^{\circ}=+491.1 \,kJ mol ^{-1}\) तथा \(\Delta_{ r } S ^{\circ}=198.0 \,JK ^{-1} mol ^{-1}\) है, \(298 K\) पर सम्भव नहीं है। वह ताप जिसके ऊपर .............\(K\) अभिक्रिया सम्भव होगी, है

  1. A \(2040.5\)
  2. B \(1890\)
  3. C \(2480.3\)
  4. D \(2380.5\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(2480.3\)

Step-by-step Solution

Detailed explanation

In order to be spontaneous \(\Delta G^o\) should be \(-ve\) \(\Delta {G^o} = \Delta {H^o} - T\Delta {S^o}\) \(0 = 491.1 \times {10^3} - T \times 198\) \(T = \frac{{491100}}{{198}} = 2480\) If temp is above \(2480\,K\), the reaction will be spontaneous.
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