MCQ
For a chemical reaction $A+B \rightleftharpoons C+D$ $\left(\Delta_{r} H^{0}=80 \,k J\right.$ $mol\,^{-1}$ ) the entropy change $\Delta_{r} S^{0}$ depends on the temperature $T$ (in $K$ ) as $\left(\Delta_{ r } S ^{0}=2 T \left(\, J \,K ^{-1}\, mol ^{-1}\right)\right.$

Minimum temperature at which it will become spontaneous is ..... $K.$(Integer)

  • A
    $50$
  • B
    $250$
  • $200$
  • D
    $150$

Answer

Correct option: C.
$200$
c
$\Delta G ^{0}=\Delta H ^{0}- T \times \Delta S ^{0}$

$\Delta G ^{0}=\Delta H ^{0}- T \times(2 T )$

$T =200\, K$

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