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. HNO3 p. NO
B. Cu+ conc.
HNO3
q. NO2
C. Zn+ dil. HNO3 r. N2O
D. Zn+ conc.
HNO3
s. Cu(NO3)2
t. Zn(NO3)2
Show Answer

Solution:

  1. A. 3Cu+8HNO33Cu(NO3)2+2NO+4H2O

Dil. B. Cu+4HNO3 Conc. Cu(NO3)2+2NO2+2H2O C. 4Zn+10HNO34Zn(NO3)2+N2O+5H2O Dil. D. Zn+4HNO3Zn(NO3)2+2NO2+2H2O

B. CaCO3CaO+CO2; calcination C. ZnSZn, 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 :
Ag2S+NaCN
Na[Ag(CN)2]
Na[Ag(CN)2]+Zn
Na2[Zn(CN)4]
+Ag
D. Decomposition of
iodide
s. Boron :
BI3ΔB+32I2

D. Cu2SCu, roasting followed by self reduction



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