Define Hydrometallurgy? - Chemistry


Define Hydrometallurgy?



Hydrometallurgy: A process of extracting metals from aqueous solutions of their salts using suitable reducing agents is called hydrometallurgy.

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2014-2015 (October)


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What is calcination?

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

Which solution is used for the leaching of silver metal in the presence of air in the metallurgy of silver?

Reduction of metal oxide to metal becomes easier if the metal obtained is in liquid state. Why?

What is the role of zinc metal in the extraction of silver ?

Name the processes from which chlorine is obtained as a by-product. What will happen if an aqueous solution of NaCl is subjected to electrolysis?

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

Which one of the following oxidation state of Manganese is unstable?

(a) + 2

(b) + 4

(c) + 5

(d) + 7

Complete the given chemical equations 

`F_2 + 2Cl^(-)`

What is the action of carbon on the following metal oxides:

Fe2O3 in the blast furnace

What is the action of carbon on the following metal oxides :

ZnO in the vertical retort furnace

An element X (molar mass = 60 g mol−1) has a density of 6.23 g cm−3. Identify the type of cubic unit cell, if the edge length of the unit cell is 4 ✕ 10−8 cm.

Account for the following :

Reducing character decreases from SO2 to TeO2.

In the extraction of chlorine by electrolysis of brine ______.

Which of the following reactions is an example of autoreduction?

Brine is electrolysed by using inert electrodes. The reaction at anode is ______.

At temperatures above 1073 K coke can be used to reduce \[\ce{FeO}\] to \[\ce{Fe}\]. How can you justify this reduction with Ellingham diagram?

Why are sulphide ores converted to oxide before reduction?

Which of the following reactions is an example of auto reduction?


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