Which reaction has positive value of G^o ? - Vidyadip

MCQ

Which reaction has positive value of $\Delta G^o$ ?

A
${F_2} + {H_2}O\,\xrightarrow{{R.T.}}2HF + \frac{1}{2}{O_2} \uparrow $
B
$C{l_2} + {H_2}O\,\xrightarrow{{R.T.}}HCl + HOCl$
C
$B{r_2} + {H_2}O\,\xrightarrow{{R.T.}}HBr + HOBr$
✓
${I_2} + {H_2}O\,\xrightarrow{{R.T.}}HI + HOI$

✓

Answer

Correct option: D.

${I_2} + {H_2}O\,\xrightarrow{{R.T.}}HI + HOI$

d
${I_2} + {H_2}O{\mkern 1mu} \xrightarrow{{R.T.}}2HI + \frac{1}{2}{O_2},\,\,\Delta G$ of this reaction is positive, hence oxidation of $I^-(aq.)$ into $I_2$ is feasible.

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