A) \[SO_{4}^{2-}\]
B) \[HCO_{3}^{-}\]
C) \[CO_{3}^{2-}\]
D) \[NO_{3}^{-}\]
Correct Answer: B
Solution :
A sodium salt of an unknown anion when treated with \[MgC{{l}_{2}}\] gives white precipitate \[(MgC{{O}_{3}})\] only one boiling. The anion is \[HCO_{3}^{-}\] ion. \[MgC{{l}_{2}}+2NaHC{{O}_{3}}\xrightarrow{{}}Mg\underset{\text{Soluble}}{\mathop{{{\left( HC{{O}_{3}} \right)}_{2}}}}\,+2NaCl\]\[Mg{{(HC{{O}_{3}})}_{2}}\xrightarrow{boiling}\underset{White\,ppt}{\mathop{MgC{{O}_{3}}}}\,+{{H}_{2}}O+C{{O}_{2}}\]
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