A) helps in the precipitation of \[AgCl\]
B) increases the solubility product of \[AgCl\]
C) increases the concentration of \[NO_{3}^{-}\] ions
D) decomposes \[\text{N}{{\text{a}}_{\text{2}}}\text{S}\] and NaCN, if formed
Correct Answer: D
Solution :
\[N{{a}_{2}}S\]and \[NaCN\], if present in the extract, will be decomposed to \[{{H}_{2}}S\] and \[HCN\] by \[HN{{O}_{3}}\]. \[NaCN+HN{{O}_{3}}\xrightarrow[{}]{{}}NaN{{O}_{3}}+HCN\] \[N{{a}_{2}}S+2HN{{O}_{3}}\xrightarrow[{}]{{}}2NaN{{O}_{3}}+{{H}_{2}}S\] These will escape from the solution and will not interfere with the test for halogens.
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