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प्रश्न
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
विकल्प
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 two metals which are found in nature in the free state.
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
Name one metal which is extracted by:
Electrolytic reduction.
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
Name two metals which are always found in combined state.
Name the metal which is extracted from the ore called ‘rock salt’.
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its ______.
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Give the chemical formula of :
Sodium aluminate
How many valence electrons are present in non- metals?
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
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.
Write the name.
The process of extraction of aluminium from alumina-
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
In extraction of copper, the flux used is ____________.
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give a reason why Aluminium is preferably used in thermite reactions.
