MCQ
For a phase change, ${H_2}O(l)\underset {{0^{\,o}}C,\,1\,bar} \longleftrightarrow {H_2}O(s)$
- ✓$\Delta G = 0$
- B$\Delta S = 0$
- C$\Delta H = 0$
- D$\Delta U = 0$
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$NO_2^ + \to N{O_2} \to NO_2^ - $

$i\,\, HCO_3$ $ii. \,H_3O^+$
$iii.\, HSO_4^-$ $iv.\, HSO_3F$
Which one of the following is the correct sequence of their acid strength?