Extraction of Metals - Result Question 55

####55. Match each of the reactions given in Column I with the corresponding product(s) given in Column II.

(2009)

Column I Column II
A. $Cu+$ dil. $HNO _3$ p. $NO$
B. $Cu+$ conc.
$HNO _3$
q. $NO _2$
C. $Zn+$ dil. $HNO _3$ r. $N _2 O$
D. $Zn+$ conc.
$HNO _3$
s. $Cu\left(NO _3\right) _2$
t. $Zn\left(NO _3\right) _2$
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Solution:

  1. A. $3 Cu+8 HNO _3 \longrightarrow 3 Cu\left(NO _3\right) _2+2 NO+4 H _2 O$

Dil. B. $Cu+\underset{\text { Conc. }}{4 HNO _3} \longrightarrow Cu\left(NO _3\right) _2+2 NO _2+2 H _2 O$ C. $4 Zn+10 HNO _3 \longrightarrow 4 Zn\left(NO _3\right) _2+N _2 O+5 H _2 O$ Dil. D. $Zn+4 HNO _3 \longrightarrow Zn\left(NO _3\right) _2+2 NO _2+2 H _2 O$

B. $CaCO _3 \longrightarrow CaO+CO _2 \uparrow$; calcination C. $ZnS \longrightarrow Zn$, can be done by carbon reduction or self reduction

Extraction
methods
Metals
extracted
A. Self reduction r. Copper, (P) Lead
B. Carbon reduction p. Lead
C. Complex formation
and displacement
by metal
q. Silver :
$Ag _2 S+NaCN$
$\longrightarrow Na\left[Ag(CN) _2\right]$
$Na\left[Ag(CN) _2\right]+Zn$
$\longrightarrow Na _2\left[Zn(CN) _4\right]$
$+Ag$
D. Decomposition of
iodide
s. Boron :
$BI _3 \stackrel{\Delta}{\longrightarrow} B+\frac{3}{2} I _2$

D. $Cu _2 S \longrightarrow Cu$, roasting followed by self reduction



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