Advertisements
Advertisements
Question
Reduction of metal oxide to metal becomes easier if the metal obtained is in liquid state. Why?
Advertisements
Solution
Entropy of a metal in the liquid state is higher than that of the same metal in the solid state (Sliquid > Ssolid). So, when the metal formed is in the liquid state and the metal oxide being reduced is in the solid state, the value of entropy change (ΔS) for the reduction reaction is more on the positive side. When the value of TΔS increases and that of ΔH remains the same, the value of ΔGr° for the reduction reaction becomes negative and thus reduction becomes easier.
APPEARS IN
RELATED QUESTIONS
Explain calcination with reactions.
What is the process in which concentrated ore is reduced to the corresponding metal by heating at high temperature with a reducing agent?
(a) Polling
(b) Pyrometallurgy
(c) Hydrometallurgy
(d) Calcination
Name the processes from which chlorine is obtained as a by-product.
MnO2 and Ca3(PO4)2 present in iron ore get reduced to Mn and P in the zone of _______.
(A) combustion
(B) reduction
(C) fusion
(D) slag formation
What is the action of carbon on the following metal oxides :
ZnO in the vertical retort furnace
Account for the following :
Reducing character decreases from SO2 to TeO2.
Which metal is also found in sea beds?
In the extraction of chlorine by electrolysis of brine ______.
Brine is electrolysed by using inert electrodes. The reaction at anode is ______.
Why are sulphide ores converted to oxide before reduction?
