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प्रश्न
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
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उत्तर
The anode is replaced from time to time because it gets oxidised by oxygen which evolves at it.
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संबंधित प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Name the most abundant metal in the earth’s crust.
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Give two uses of bronze.
Bronze is an alloy of copper and ______.
The rocky material found with ores is called ______.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Which metal is extracted from calamine ore?
The major ore of aluminium is known as ______.
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what is ignition mixture?
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
Name the methods by which concentrated ore is converted to metallic oxide.
Observe the given figure of reactivity series of metals and answer the following questions:
Reactivity series of metals
- Name two metals which react with water.
- Name two moderately reactive metals.
- Name the most highly reactive metal and the most less reactive metal.
Atomic number of aluminium is _______ and its electronic configuration is _______.
_______ is the least reactive metal.
Zinc sulphide : Roasting : : zinc carbonate : _______
Gold and silver are active metals.
Explain the concept of Roasting.
