| (I) turbidity with baryta water and |
| (II) turns acidified dichromate solution green. |
| The reaction indicates the presence of |
A) \[CO_{3}^{2-}\]
B) \[{{s}^{2-}}\]
C) \[SO_{3}^{2-}\]
D) \[NO_{3}^{-}\]
Correct Answer: C
Solution :
[c] \[N{{a}_{2}}S{{O}_{3}}+2HCl\left( dil \right)\to \] \[2NaCl+{{H}_{2}}O+S{{O}_{2}}\] \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}+{{H}_{2}}S{{O}_{4}}+3S{{O}_{2}}\to \] \[\underset{Green}{\mathop{{{K}_{2}}S{{O}_{4}}+C{{r}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}+{{H}_{2}}O}}\,\]
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