A metallic salt insoluble in dil HNO3, but dissolves in excess of ammonia solution.
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Explanation:
When silver metal (compound A) is boiled in dilute nitric acid, it forms silver nitrate (compound B) and nitrogen dioxide gas (compound C).
Ag+2HNO
3
boil
AgNO
3
+NO
2
+H
2
O
Silver nitrate reacts with NaCl to form white precipitate of silver chloride (compound D) which dissolves in ammonium hydroxide.
AgNO
3
+NaCl→NaNO
3
white
AgCl↓
Silver nitrate reacts with hypo solution to form a white precipitate of Ag
2
S
2
O
3
which is compound .
2AgNO
3
+Na
2
S
2
O
3
→
white
Ag
2
S
2
O
3
↓
+2naNO
3
On standing Ag
2
S
2
O
3
turns to black Ag
2
S which is compound F.
Ag
2
S
2
O
3
+H
2
O→
black
Ag
2
S↓
+H
2
SO
4
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