A) Silver halides are soluble in \[HN{{O}_{3}}\]
B) \[N{{a}_{2}}S\] and \[NaCN\] are decomposed by \[HN{{O}_{3}}\]
C) \[A{{g}_{2}}CN\] is soluble in \[HN{{O}_{3}}\]
D) \[AgCN\] is soluble in \[HN{{O}_{3}}\]
Correct Answer: B
Solution :
\[HN{{O}_{3}}\] is added to decompose \[N{{a}_{2}}S\] and \[NaCN\]otherwise \[N{{a}_{2}}S\] will give black ppt. of \[A{{g}_{2}}S\] and \[NaCN\] will white ppt. of \[AgCN\] which would interfere with the test of Halogens.
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