JEE Advance - Chemistry (2008 - Paper 2 Offline - No. 22)
Match the conversions in Column I with the type(s) of reaction(s) given in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 $$\times$$ 4 matrix given in the ORS.
| Column I | Column II | ||
|---|---|---|---|
| (A) | PbS $$\to$$ PbO | (P) | roasting |
| (B) | CaCO$$_3$$ $$\to$$ CaO | (Q) | Calcination |
| (C) | ZnS $$\to$$ Zn | (R) | carbon reduction |
| (D) | Cu$$_2$$S $$\to$$ Cu | (S) | self reduction |
Explanation
A. For PbS $$\to$$ O$$_2$$ PbO, roasting is done.
B. For CaCO$$_3$$ $$\to$$ CaO, calcinations is done in the absence of air.
C. For ZnS $$\to$$ Zn, there is roasting is followed by reduction
2ZnS + 3O$$_2$$ $$\buildrel \Delta \over \longrightarrow $$ 2ZnO + 2SO$$_2$$ $$\uparrow$$
2ZnSO$$_4$$ $$\buildrel \Delta \over \longrightarrow $$ ZnO + SO$$_2$$ + $$\frac{1}{2}$$O$$_2$$ $$\uparrow$$
ZnO $$\buildrel \Delta \over \longrightarrow $$ Zn + CO $$\uparrow$$
D. For Cu$$_2$$S $$\to$$ Cu, roasting is done followed by self-reduction.
2Cu$$_2$$S + 3O$$_2$$ $$\to$$ 2Cu$$_2$$O + 2SO$$_2$$
Cu$$_2$$S + 2Cu$$_2$$O $$\to$$ 6Cu + SO$$_2$$
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