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प्रश्न
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
पर्याय
Right
Wrong
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उत्तर
In the electrolytic reduction of alumina, the lining of graphite acts as an anode- Wrong
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संबंधित प्रश्न
Name the most abundant metal in the earth's crust.
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
How is aluminium metal extracted? Explain with the help of an equation.
Manganese metal is extracted from manganese dioxide by a reduction process by making use of:
(a) carbon
(b) hydrogen
(c) electrolysis
(d) aluminium
State three objectives achieved during the roasting of ores.
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Name the following:
Name two metals always find in combined state.
How many valence electrons are present in metals ?
Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass
Which one of the following is not true of metal :
Metals are good conductors of electricity.
Define roasting.
Sulphide ores : Roasting : : Carbonate ores : _______
Write the name.
The process of strong heating of carbonate ores in insufficient air–
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
Care must be taken while diluting concentrated nitric acid with water. Why?
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.
