Extraction Of Metals Result Question 56
56. Match the conversions in Column I with the type(s) of reaction(s) given in Column II
(2008, 6M)
| Column I | Column II | |||
|---|---|---|---|---|
| A. | $\mathrm{PbS} \longrightarrow \mathrm{PbO}$ | p. | Roasting | |
| B. | $\mathrm{CaCO}_3 \longrightarrow \mathrm{CaO}$ | q. | Calcination | |
| C. | $\mathrm{ZnS} \longrightarrow \mathrm{Zn}$ | r. | Carbon reduction | |
| D. | $\mathrm{Cu}_2 \mathrm{~S} \longrightarrow \mathrm{Cu}$ | s. | Self-reduction |
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Answer:
Correct Answer: 56. ( $\mathrm{A} \rightarrow \mathrm{p} ; \mathrm{B} \rightarrow \mathrm{q} ; \mathrm{C} \rightarrow \mathrm{r}, \mathrm{s} ; \mathrm{D} \rightarrow \mathrm{p}, \mathrm{s}$ )
Solution:
- A. $\mathrm{PbS} \xrightarrow{\mathrm{O} _2} \mathrm{PbO}+\mathrm{SO} _2$, roasting
B. $\mathrm{CaCO} _3 \longrightarrow \mathrm{CaO}+\mathrm{CO} _2 \uparrow$; calcination
C. $\mathrm{ZnS} \longrightarrow \mathrm{Zn}$, can be done by carbon reduction or self reduction
D. $\mathrm{Cu} _2 \mathrm{~S} \longrightarrow \mathrm{Cu}$, roasting followed by self reduction
BETA
