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प्रश्न
Write the name.
Metals which are amphoteric in nature.
उत्तर
Metals which are amphoteric in nature- Aluminium (Al), zinc (Zn)
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संबंधित प्रश्न
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
Name the method by which aluminium metal is extracted.
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium
(b) tin
(c) zinc
(d) copper
A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising
Name the following:
The mixture of materials fed into a furnace to extract a metal.
Define the term : Slag
Which method of refining is used to get 99.8% pure aluminium?
Answer the following question :
What is the difference between calcination and roasting.
Name the following:
A steel grey coloured solid non-metal.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
_______ is the least reactive metal.
Write the name.
The molecular formula of main ore of aluminium –
Gold and silver are active metals.
Explain concept with example/explain with the help of a balanced equation.
Roasting
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
In extraction of copper, the flux used is ____________.
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
