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प्रश्न
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
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उत्तर
In Electrolytic reduction of alumina, Anode : Set of carbon (graphite) rods : : Cathode : Graphite lining
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संबंधित प्रश्न
Name one metal which is extracted by reduction with carbon.
Name one metal which is extracted by reduction with aluminium.
Give the name and chemical formula of one ore of copper.
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium
(b) tin
(c) zinc
(d) 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?
When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity.
(a) What is metal A?
(b) What is metal C?
(c) Name the substance B.
(d) Name the substance D.
How are metals refined by the electrolytic methods?
What is the difference between calcination and roasting?
Write the name.
Metals which are amphoteric in nature.
Write the name.
The process of strong heating of carbonate ores in insufficient air–
Gold and silver are active metals.
Explain Bayer’s process.
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
Explain concept with example/explain with the help of a balanced equation.
Roasting
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
Explain Bayer’s process of concentration of bauxite with a chemical equation.
Which of the following ore is concentrated by the Froth floatation process?
An alloy is
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Identify the substance oxidised and reduced in the above reaction.
