A) silver thiosulphate
B) silver sulphide
C) silver sulphate
D) silver sulphite
Correct Answer: B
Solution :
With a very dilute solution of\[N{{a}_{2}}{{S}_{2}},{{O}_{3}}\]silver nitrate gives a white -precipitate which quickly changes colour to yellow, brown and finally black due to the formation of silver sulphide. \[2AgN{{O}_{3}}+N{{a}_{2}}{{S}_{2}}{{O}_{3}}\xrightarrow[{}]{{}}\underset{white\,ppt}{\mathop{A{{g}_{2}}{{S}_{2}}{{O}_{3}}}}\,+NaN{{O}_{3}}\] \[A{{g}_{2}}{{S}_{2}}{{O}_{3}}+{{H}_{2}}O\xrightarrow[{}]{{}}\underset{black}{\mathop{A{{g}_{2}}S}}\,+{{H}_{2}}S{{O}_{4}}\]
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