A) \[CO_{3}^{2-}\]
B) \[{{S}^{2-}}\]
C) \[SO_{3}^{2-}\]
D) \[NO_{2}^{-}\]
Correct Answer: C
Solution :
\[N{{a}_{2}}S{{O}_{3}}+2HCl(\text{dil}\text{.})\to 2NaCl+{{H}_{2}}O+S{{O}_{2}}\], \[{{K}_{2}}C{{r}_{2}}{{O}_{2}}+{{H}_{2}}S{{O}_{4}}+3S{{O}_{4}}\to {{K}_{2}}S{{O}_{4}}+\underset{\text{(Green)}}{\mathop{C{{r}_{2}}{{(S{{O}_{4}})}_{3}}}}\,+{{H}_{2}}O\]
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