MCQ
Change in volume when $10\,\,ml$ of phosphine is decomposed
- A$5\,\,ml$ decrease
- BNo change
- ✓$5\,\,ml$ increase
- D$10\,\,ml$ increase
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$2H_2(g) + O_2(g) \to 2H_2O(l)$ ; $\Delta _fH^o_{298}(H_2O(l)) = -285.5\, kJ/mol$
What is $\Delta S^o_{298}$ for the given fuel cell reaction ?
Given $: O_2(g) + 4H^+(aq) + 4e^- \to 2H_2O(l)$ $E^o = 1.23\, V$

$(A)$ Addition of an electron in $O_2$ decreases bond order
$(B)$ Addition of an electron in $O_2$ increases bond order
$(C)$ Removal of an electron from $O_2$ increases bond length
$(D)$ Removal of an electron from $O_2$ decreases bond length