Question

Which of the following hydrogen halides reacts with \[AgN{{O}_{3}}(aq)\]to give a precipitates that dissolves in \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}(aq)\]?
This question has multiple correct options.
A. \[HCl\]
B. \[HF\]
C. \[HBr\]
D. \[HI\]

Answer 1

Hint: Hydrogen halides are generally diatomic inorganic compounds having the formula HX where H is hydrogen and X stands for halogens; fluorine, chlorine, bromine, iodine or astatine.

Complete Step by step solution: Halides generally contain halogens along with hydrogen represented by HX. Hydrogen halides are gases which dissolve in water to give acids which are commonly known by the name hydrohalic acids. These can be synthesized by the direct reaction of hydrogen with fluorine and chlorine gives hydrogen fluoride and hydrogen chloride, respectively. According to question when hydrogen halides react with \[AgN{{O}_{3}}(aq)\] it gives \[AgX\] which further dissolves in \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}(aq)\] and give soluble precipitates except fluorine; it does not react with \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}(aq)\] to give soluble precipitates reaction can be shown as follows:
A. \[HCl\]:
\[AgN{{O}_{3}}+HCl\to AgCl+HN{{O}_{3}}\]
\[AgCl+N{{a}_{2}}S{{O}_{3}}\to NaCl+A{{g}_{2}}S{{O}_{3}}\]
\[A{{g}_{2}}S{{O}_{3}}+N{{a}_{2}}S{{O}_{3}}\to N{{a}_{5}}[Ag{{({{S}_{2}}{{O}_{3}})}_{3}}]\] (Soluble precipitates)
B. \[HF\]:
\[AgN{{O}_{3}}+HF\to AgF+HN{{O}_{3}}\]
\[AgF+N{{a}_{2}}S{{O}_{3}}\to Noreaction\]
C. \[HBr\]:
\[AgN{{O}_{3}}+HBr\to AgBr+HN{{O}_{3}}\]
\[AgBr+N{{a}_{2}}S{{O}_{3}}\to NaBr+A{{g}_{2}}S{{O}_{3}}\]
\[A{{g}_{2}}S{{O}_{3}}+N{{a}_{2}}S{{O}_{3}}\to N{{a}_{5}}[Ag{{({{S}_{2}}{{O}_{3}})}_{3}}]\] (Soluble precipitates)
D. \[HI\]:
\[AgN{{O}_{3}}+HI\to AgI+HN{{O}_{3}}\]
\[AgI+N{{a}_{2}}S{{O}_{3}}\to NaI+A{{g}_{2}}S{{O}_{3}}\]
\[A{{g}_{2}}S{{O}_{3}}+N{{a}_{2}}S{{O}_{3}}\to N{{a}_{5}}[Ag{{({{S}_{2}}{{O}_{3}})}_{3}}]\] (Soluble precipitates)

Thus option A, C and D are correct options.

Note: Hydrogen halides are colorless gases at standard conditions for temperature and pressure except for hydrogen fluoride as it boils at very low temperature even at 19 degrees. Out of the hydrogen halides only hydrogen fluoride exhibits hydrogen bonding between molecules and therefore has the highest melting and boiling points of the HX series.