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 form comparitively stronger acids (than \[{{H}_{2}}C{{O}_{3}}\]) in solution hence evolve \[C{{O}_{2}}\] with \[N{{a}_{2}}C{{O}_{3}}\] soluton and give effervesence. While \[CO_{3}^{2-}\]does not react with \[N{{a}_{2}}C{{O}_{3}}\] solution.
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