MCQ
The acid which forms two series of salts is
- A${H_3}P{O_4}$
- ✓${H_3}P{O_3}$
- C${H_3}B{O_3}$
- D${H_3}P{O_2}$
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$(R = 8.314 \,J/mol\,K)\,(\ln 7.5 =2.01)$

$\mathop {Al}\limits_{Metal} \xrightarrow{{HCl(aq.)}}'X' + Gas\,'P'$
$\mathop {Al}\limits_{metal} \xrightarrow[{ + {H_2}O}]{{NaOH\,(aq.)}}'Y' + Gas\,'Q'$