Question

2. Give balanced chemical equations:
a. Heating of calamine.
b. Roasting of Zinc Blende.
c. Thermal of decomposition of silver oxide.
d. Electrolysis of alumina.
e. Oxidation of anode in the extraction of aluminium.
PLS ANSWER...VERY URGENT!!!

Answer 1

Answer:

a) ZnCO3--->(heat) ZnO+ CO2.

b) 2ZnS + 3O2 --->2ZnO + 2SO2

c) 2Ag2O ----> 4Ag + O2

d) 2Al2O3 ----> 4Al + 3O2

e)Al(OH)3 →Al 2 O3 +water

The oxygen evolved at the anode escapes as a gas or reacts with the carbon anode. The anode is thus oxidized to carbon monoxide which either burns giving CO2  or escapes. Thus, anode has to be replaced as it is consumed periodically.

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