SATHEE: Qualitative Analysis - Result Question 48

Qualitative Analysis - Result Question 48

####51. $A_{1}$ and $A_{2}$ are two ores of metal $M . A_{1}$ on calcination gives black precipitate, $C O_{2}$ and water.

$A_{2} \overset{Roasting}{\to} Metal + \underset{\begin{matrix} Gas \\ Green colour \end{matrix}}{K_{2} C r_{2} O_{7} + H_{2} S O_{4}}$

Identify $A_{1}$ and $A_{2}$ .

(2004)

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Solution:

$A_{1} = C u (O H)_{2} \cdot C u C O_{3}$ and $A_{2} = C u_{2} S$

$\begin{array}{r} A_{1} \overset{Calcination}{\to} 2 C u O + C O_{2} + H_{2} O \\ Black \\ A_{1} \overset{Dil. H C l}{\to} C u C l_{2} + C O_{2} + H_{2} O \\ 2 C u C l_{2} + 4 K I ⟶ 2 C u I + I_{2} + 4 K C l \\ 2 C u_{2} S (A_{2}) + 3 O_{2} ⟶ 2 C u_{2} O + 2 S O_{2} \\ C u_{2} S + 2 C u_{2} O \overset{Δ}{⟶} 6 C u + S O_{2} \end{array}$

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Qualitative Analysis - Result Question 48

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