Aqueous solution of a salt \( +\mathrm{MgSO}_{4} \) solution \( \longrightarrow \) no precipitat...

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Aqueous solution of a salt \( +\mathrm{MgSO}_{4} \) solution \( \longrightarrow \) no precipitate in cold \( \stackrel{\text { Heating }}{\longrightarrow} \) White precipitate appears. The salt contains the acidic radical:
(a) \( \mathrm{CO}_{3}^{2-} \)
(b) \( \mathrm{HCO}_{3}^{-} \)
(c) \( \mathrm{SO}_{3}^{2-} \)
(d) \( \mathrm{C}_{2} \mathrm{O}_{4}^{2-} \)
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