A) to remove silver halides
B) to decompose\[N{{a}_{2}}S\]and\[NaCN,\]if present
C) to dissolve \[A{{g}_{2}}S\]
D) to dissolve\[AgCN,\]if formed
E) because\[A{{g}_{2}}S\]and\[AgCN\]are insoluble in nitric acid
Correct Answer: B
Solution :
To test halogens, it is necessary to remove sodium cyanide and sodium sulphide from the sodium extract, if N and S are present. This is done by boiling sodium extract with cone\[HN{{O}_{3}}\]. \[NaCN+HN{{O}_{3}}\xrightarrow{{}}NaN{{O}_{3}}+HCN\uparrow \] \[N{{a}_{2}}S+2HN{{O}_{3}}\xrightarrow{{}}2NaN{{O}_{3}}+{{H}_{2}}S\uparrow \]
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