Question

Solution A reacts with an acid B (which gives greenish yellow gas on reacting with oxidizing agents like$P{b}_3{O}_4$ to give white precipitate C insoluble in nitric acid but soluble in ammonium hydroxide. Name A, B and C.​

Answer 1

Hydrochloric acid in reaction with oxidizing agents like $P{b}_3{O}_4$ gives chlorine which is a greenish yellow gas.​ ​

• The reaction occurs as:​ ​

$P{b}_3{O}_4$ + 8HCl → $3PbC{l}_2$ +$4H_{2}O$ +$C{l}_2$​
(A greenish yellow gas)​ ​

• Hydrochloric acid (B) reacts with silver nitrate solution (A) to form a curdy white precipitate of silver chloride (C).​ ​
• The reaction occurs as:​

$AgN{O}_3$ + HCl → AgCl ↓+ $HN{O}_3$​
This silver chloride is soluble in excess of ammonium hydroxide but is insoluble in dilute HNO3​

• ​The reaction occurs as:​

AgCl + $2N{H}_{4}OH$→ $Ag(N{H}_3{)}_{2}Cl$ +$2H_{2}O$

​

Hence it is concluded that:​

• A is Silver nitrate​

• B is Hydrochloric acid​

• C is Silver chloride​