Advertisements
Advertisements
प्रश्न
Explain in brief types of extraction of highly reactive metals according to their reactivity.
Advertisements
उत्तर
Extraction of highly reactive metals:
- Highly reactive metals such as sodium, magnesium and calcium are obtained by electrolytic reduction.
- The metals are deposited at the cathode (negatively charged electrode), whereas chlorine gas is liberated at the anode (positively charged electrode).
E.g. For extraction of sodium metal, cathode and anode reactions are as follows:
At cathode: \[\ce{Na+ + e^- -> Na}\] (Reduction)
At anode: \[\ce{2Cl- -> Cl2 + 2e^-}\] (Oxidation)
APPEARS IN
संबंधित प्रश्न
Name the following:
Main ore of aluminium.
In the extraction of aluminium: Name the process of concentration of bauxite.
Give a reason for the following:
Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Name the method by which aluminium metal is extracted.
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
Name the gas produced when calamine ore is calcined.
Name two metals which are found in nature mainly in the free state (as metallic elements).
How is aluminium metal extracted? Explain with the help of an equation.
Which metal is extracted from calamine ore?
Define the following term.
Mineral
Give the chemical formula of :
Cryolite
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?
What is galvanized iron.
Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Write the name.
The process of extraction of aluminium from alumina-
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give the reason why the above reaction is known as a thermite reaction.
