Advertisements
Advertisements
प्रश्न
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
In the extraction of aluminium Write the function and chemical formula of cryolite
Advertisements
उत्तर
Cryolite is added to the molten mixture of alumina to reduce the melting point. The formula of cryolite is Na3AlF6.
APPEARS IN
संबंधित प्रश्न
Name two metals which are found in nature in the free state.
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
Explain why, carbon cannot reduce oxides of sodium or magnesium.
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
Which of the following pair of metals exists in their native state in nature?
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
The metal which is always present in an amalgam is ______.
Manganese metal is extracted from manganese dioxide by a reduction process by making use of ______.
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its ______.
Give the chemical formula of :
Cryolite
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
What is passive iron?
Write equations for each of the above metal which reacts with water.
How many valence electrons are present in non- metals?
Name the following:
The process of heating an ore to a high temperature in the presence of air.
Define roasting.
What is the difference between calcination and roasting?
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.
