| (a) It gives a white turbidity with dilute \[HCl\] solution |
| (b) It decolourises a solution of iodine in potassium iodide |
| (c) It gives a white precipitate with silver nitrate solution which turns black on standing. |
A) \[N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O\]
B) \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}.5{{H}_{2}}O\]
C) \[N{{a}_{2}}S{{O}_{4}}.10{{H}_{2}}O\]
D) None of these
Correct Answer: B
Solution :
[b] \[X=N{{a}_{2}}{{S}_{2}}{{O}_{3}}.5{{H}_{2}}O\] \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}+2HCl\xrightarrow{{}}\] \[2NaCl+{{H}_{2}}O+S+S{{O}_{2}}\] \[K{{I}_{3}}+2N{{a}_{2}}{{S}_{2}}{{O}_{3}}\xrightarrow{{}}\] \[KI+2NaI+N{{a}_{2}}{{S}_{4}}{{O}_{6}}\]\[2AgN{{O}_{3}}+N{{a}_{2}}{{S}_{2}}{{O}_{3}}\xrightarrow{{}}\] \[A{{g}_{2}}{{S}_{2}}{{O}_{3}}+2NaN{{O}_{3}}\] \[A{{g}_{2}}{{S}_{2}}{{O}_{3}}+{{H}_{2}}O\xrightarrow{{}}A{{g}_{2}}S+{{H}_{2}}S{{O}_{4}}\]
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