A) \[\overline{C}r,HCl\]
B) \[SO_{3}^{2-},S{{\text{O}}_{2}}\]
C) \[{{S}^{2-}},{{H}_{2}}S\]
D) \[CO_{3}^{2-},C{{O}_{2}}\]
Correct Answer: B
Solution :
[b] \[\underset{(X)}{\mathop{SO_{3}^{2-}}}\,+2{{H}^{\oplus }}\to S{{O}_{2}}+{{H}_{2}}O\] \[\underset{(Y)}{\mathop{3S{{O}_{2}}}}\,+{{K}_{2}}C{{r}_{2}}{{O}_{7}}+{{H}_{2}}S{{O}_{4}}\to \] \[{{K}_{2}}S{{O}_{4}}+\underset{\begin{smallmatrix} Green\text{ }coloured\text{ } \\ solution \end{smallmatrix}}{\mathop{C{{r}_{2}}{{(S{{O}_{4}})}_{2}}+{{H}_{2}}O}}\,\]
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