Reduction of Metal Oxides to Metals

Copper can be extracted from

Copper can be extracted from

What is the incorrect reason for the statement "In many reactions, hydrogen acts as a reducing agent but it is not widely used as a reducing agent for metal extraction"?

The most commonly used reducing agent for reduction of metal oxides into metals is

Which of the following give respective metal by self reduction?

In the extraction of copper, the solidified copper has blistered appearance due to

Which of the following metal can be extracted by self reduction process?

Which of the following is used to reduce ${\mathrm{TiCl}}_4$ to $\mathrm{Ti}?$

Which of the following oxides cannot be reduced by auto or self reduction?

The element which is most difficult to be extracted from it's oxide using coke as a reducing agent is:

In the extraction of copper from its sulphide ore, metal is finally obtained by the oxidation of cuprous sulphide with:

The element which is most difficult to be extracted from it's oxide using coke as a reducing agent is:

The process which involves smelting is

Which of the following reactions is an example of autoreduction?

In blast furnace, this is acting as reducing agent at lower part:

Försmelting of $\mathrm{Cu}$ correct statements is

Redúcing agent of haematite in blast-furnace is :-

In self reduction process, the species which bring about the reduction is :

$\mathrm{Pbs}\underset{∆}{\overset{\mathrm{air}}{\to }}\mathrm{X}, \mathrm{X}+\mathrm{Pbs}\to \mathrm{Pb}+{\mathrm{SO}}_2$, '$X$' is: