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प्रश्न
Extraction of moderately reactive elements is done by _______ and _______ method.
विकल्प
roasting and calcination
roasting and reduction
separation and calcination
none of these
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उत्तर
Extraction of moderately reactive elements is done by roasting and calcination method.
संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Name one metal which is extracted by reduction with aluminium.
Give the name and chemical formula of one ore of copper.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
The two metals which can be extracted just by heating their sulphides in air are:
(a) sodium and copper
(b) copper and aluminium
(c) potassium and zinc
(d) mercury and copper
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
(a) Name the metal and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why?
Define the following term.
Mineral
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
Name the following:
Two metals which are found in the free or native state.
Compare the process of calcination and roasting.
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 ______.
Define roasting.
Answer the following question:
Carbon cannot reduce the oxides of sodium, magnesium, and aluminum to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can the same process not be applied for them? Name the process used for the extraction of these metals.
Sulphide ores : Roasting : : Carbonate ores : _______
Gold and silver are active metals.
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
