A) \[CO_{3}^{2-}\]
B) \[SO_{3}^{2-}\]
C) \[{{S}^{2-}}\]
D) \[SO_{4}^{2-}\]
Correct Answer: A
Solution :
\[SO_{3}^{2-},{{S}^{2-}}\]and \[SO_{4}^{2-}\] salts from comparatively stronger acids (than \[{{H}_{2}}C{{O}_{3}})\] in solution hence evolve \[C{{O}_{2}}\] with \[N{{a}_{2}}C{{O}_{3}}\] solution and give effervesence. While \[CO_{3}^{2-}\] does not react with \[N{{a}_{2}}C{{O}_{3}}\] solution
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