A) silver halides are soluble in \[HN{{O}_{3}}\]
B) \[N{{a}_{2}}S\] and NaCN are decomposed by \[HN{{O}_{3}}\]
C) \[A{{g}_{2}}S\] is soluble in \[HN{{O}_{3}}\]
D) \[AgCN\] is soluble in \[HN{{O}_{3}}\]
Correct Answer: B
Solution :
[b] \[N{{a}_{2}}S\] and \[NaCN,\] formed during fusion with metallic sodium, must be removed before adding\[AgN{{O}_{3}}\], otherwise black ppt. due to \[N{{a}_{2}}S\] or white precipitate due to \[AgCN\] will be formed and thus white precipitate of \[AgCl\] will not be identified easily. \[N{{a}_{2}}S+2AgN{{O}_{3}}\xrightarrow{{}}2NaN{{O}_{3}}+\underset{Black}{\mathop{A{{g}_{2}}S}}\,\downarrow \] \[NaCN+AgN{{O}_{3}}\xrightarrow{{}}NaN{{O}_{3}}+\underset{White}{\mathop{AgCN}}\,\downarrow \] \[NaCl+AgN{{O}_{3}}\xrightarrow{{}}NaN{{O}_{3}}+\underset{White}{\mathop{AgCl}}\,\downarrow \] \[N{{a}_{2}}S+2HN{{O}_{3}}\xrightarrow{boil}2NaN{{O}_{3}}+{{H}_{2}}S\uparrow \] \[NaCN+HN{{O}_{3}}\xrightarrow{boil}NaN{{O}_{3}}+HCN\uparrow \]
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