Question

General method for the extraction of metal from its oxide are is .
A Carbon reduction
B Reduction by aluminium
C Reduction by hydrogen
D Electrolytic reduction

Answer 1

The complete process of obtaining a pure metal from one of its ores is known as metallurgy. In metallurgy these are three main steps involved.
Concentration of ore.
Isolation/ Extraction of metal in a rude state from the concentrated ore.
Purification or refining of rude metal.

Complete step by step solution:
In the process of extraction / solution of metal from oxides ores, the reduction of concentrated rude are to rude metal can be done by using various methods such as pyrometallurgy hydrometallurgy and electrometallurgy.
As crude is converted into metal oxides, metal oxides are easier to convert into crude metal for the purpose of extraction of metal involving two steps.
Conversion of are into metallic oxide.
Reduction of metallic oxide to free metal.
To reduce the metal oxide to rude metal various reducing agents are used like carbon, hydrogen, aluminium, carbon monoxide . etc.
Reduction of metal oxide can also be carried out by self reduction process and electrolytic reduction.
So on the basis of this we can say that all the options are correct because all are the general method . Which are used for the reduction of metal oxides.
So, correct answer are option A, B, C and D.

Note: In the conversion of metallic oxide from the crude metal, there are two processes used.
Calcination :- when the rude area is heated below fusion temperature in absence of air is called calcination.
e.g, Aluminium, Iron, Zinc, Copper, Calcium, ore are converted into its metal oxides by the process of calcinations.
Like $CaC{{O}_{3}}\to CaO+C{{O}_{2}}$
$ZnC{{O}_{3}}\to ZnO+C{{O}_{2}}$
$A{{l}_{2}}{{O}_{3}}.2{{H}_{2}}o\to A{{l}_{2}}{{O}_{3}}$
Roasting :- It is a process in which it is rude or is heated in the presence of air.
e.g,
${{S}_{8}}+8{{O}_{2}}\to 8S{{O}_{2}}$( Sulphur dioxide)
$ZnS+3{{O}_{2}}\to 2ZnO+2S{{O}_{2}}$