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प्रश्न
Write the name.
The process of strong heating of carbonate ores in insufficient air–
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उत्तर
The process of strong heating of carbonate ores in insufficient air– Calcination
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संबंधित प्रश्न
Define the Ore.
Write the composition of the alloy called bronze.
Name one metal which is extracted by reduction with carbon.
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
Explain givem equation, what happens when a mixture of Cu2O and Cu2S is heated?
Name two metals which are found in nature mainly in the free state (as metallic elements).
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
What is galvanized iron.
X is an element in the form of a powder. X burns in oxygen and the product is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences:
(a) If X is a metal, then the litmus will turn ______.
(b) If X is a non-metal, then the litmus will turn ______.
(c) If X is a reactive metal, then ______ will be evolved, when X reacts with dilute sulphuric acid.
(d) If X is a non -metal, it will form _ oxide, which will form ______ solution with water.
(e) If X is a non -metal, it will not conduct electricity unless it is carbon in the form of ______.
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Usually ______ ores are subjected to ______ which is done in the absence of air.
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Explain the concept of Roasting.
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
