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प्रश्न
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
विकल्प
Right
Wrong
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उत्तर
In the electrolytic method, a layer of highly active metal is applied to a less active metal- Wrong
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संबंधित प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
Name one metal which is extracted by reduction with carbon.
Fill in the following blank with suitable word:
The non-metal present in steel is ............
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
Rock salt is an ore of one of the following metals. This metal is:
(a) Mn
(b) Na
(c) Fe
(d) Cu
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Give reasons, why aluminum is used in:
In aluminiothermy
Give reasons, why aluminum is used in:
In making ships
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
Name the following:
A steel grey coloured solid non-metal.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
Sulphide ores : Roasting : : Carbonate ores : _______
Explain the concept of Calcination.
Explain concept with example/explain with the help of a balanced equation.
Ionic bond and ionic compounds
Explain concept with example/explain with the help of a balanced equation.
Calcination
Explain in brief types of extraction of highly reactive metals according to their reactivity.
On the basis of reactivity metals are grouped into three categories:
- Metals of low reactivity
- Metals of medium reactivity
- Metals of high reactivity
Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.
Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.
Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.
(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.
(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?
(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.
OR
(c) Differentiate between roasting and calcination giving chemical equation for each.
A mineral from which the metal can be extracted economically and conveniently is known as ______.
