Q17 / 225 · JEE Main 2002 · Chemistry

If an endothermic reaction is non- spantaneous at freezing point of water and becomes feasible at its boiling point, then

  • A
    $\Delta \mathrm{H}$ is - ve, $\Delta \mathrm{S}$ is + ve
  • Correct answer
    B
    $\Delta \mathrm{H}$ and $\Delta \mathrm{S}$ both are $+$ ve
  • C
    $\Delta \mathrm{H}$ and $\Delta \mathrm{S}$ both are $-$ ve
  • D
    $\Delta \mathrm{H}$ is $+$ ve, $\Delta \mathrm{S}$ is $-\mathrm{ve}$

Solution

$\Delta \mathrm{H}$ +ve at low temperature and $\Delta \mathrm{S}$ +ve at low temperature shows that reaction is non spontaneous At high temperature (boiling point) becomes feasible

Hence, the correct answer is option: 'B'.

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