SATHEE: Qualitative Analysis - Result Question 73

Qualitative Analysis - Result Question 73

####76. What happen when

(i) hydrogen sulphide is bubbled through an aqueous solution of sulphur dioxide.

(ii) aqueous ammonia is added dropwise to a solution of copper sulphate till it is in excess.

(iii) tin is treated with concentrated nitric acid.

(iv) $C r C l_{3}$ solution is treated with sodium hydroxide and then with hydrogen peroxide.

(v) $P b_{3} O_{4}$ is treated with nitric acid.

$(1985, 5 M)$

Show Answer

Solution:

(i) $S O_{2} + 2 H_{2} S ⟶ 3 S + 2 H_{2} O$

(ii) $C u S O_{4} + 4 N H_{3} ⟶ [C u {(N H_{3})}_{4}] S O_{4}$ (iii) $S n + \underset{Conc.}{3 H N O_{3}} ⟶ \underset{\begin{matrix} Metastannic acid \end{matrix}}{H_{2} S n O_{3}} + 4 N O_{2} + H_{2} O$

(iv) $H_{2} O_{2} + C r C l_{3} + N a O H ⟶ \underset{Yellow}{N a_{2} C r O_{4}} + N a C l + H_{2} O$

(v) $P b_{3} O_{4} ⟶ 2 P b O + P b O_{2}$

$2 P b O + P b O_{2} + 4 H N O_{3} ⟶ 2 P b {(N O_{3})}_{2} + 2 H_{2} O + P b O_{2} ↓$

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Qualitative Analysis - Result Question 73

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