Refining of Metals

During the electrolytic refining of copper what happens at the anode?

Look at the image and answer the following question.

In the activity, a thin sheet of copper is made

The chemical formula of cinnabar is 

Which of the following id used as reducing agent in the thermite reaction?

During electrolytic production of aluminium, the carbon anodes are replaced from time to time because 

In Alumino-Thermite process aluminium is used as 

The metal which can be refined by liquation is

Which of the following is not a method of purification of metals?

In thermite reaction, a metal oxide is reduced to metal using a metal '$X$' as a reducing agent. The metal '$X$' refers to

Write three uses of iron.

The chemical formula of magnetite is _____.

$\mathrm{A}$: ${\mathrm{Fe}}_2{\mathrm{O}}_3$

$\mathrm{B}$: $\mathrm{FeO}$

$\mathrm{C}$: ${\mathrm{Fe}}_3{\mathrm{O}}_4$

Enter your correct answer as $\mathrm{A}, \mathrm{B},$ or $\mathrm{C}$.

The ore of iron is: 

Write the cathodic reaction involved in the extraction of potassium from potassium chloride.

Write the anodic reaction involved in the extraction of potassium from potassium chloride.

The anode used in the electrolysis of potassium chloride is: _____

The cathode used in the electrolysis of potassium chloride is:

Describe the extraction of potassium from potassium chloride.

In the Down's process of extraction of sodium from molten sodium chloride, the reason for adding anhydride calcium chloride is:

The gas which gets collected at the anode in the electrolysis of molten $\mathrm{NaCl}$ is:

During the extraction of sodium from brine, water molecules undergo the following reaction:

$2{\mathrm{H}}_2\mathrm{O}+2{\mathrm{e}}^{-}\to {\mathrm{H}}_2\uparrow +2{\mathrm{OH}}^{-}$

On which electrode will this reaction take place?