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प्रश्न
Write the name.
Metals which are amphoteric in nature.
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उत्तर
Metals which are amphoteric in nature- Aluminium (Al), zinc (Zn)
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संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
Name two metals which are found in nature in the free state.
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
How is zinc extracted from its carbonate ore (calamine)? Explain with equations.
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
Calamine ore can be used to extract one of the following metals. This metal is:
Which of the following metals are extracted by the electrolysis of their molten chlorides?
Aluminum is used in thermite welding:
what is ignition mixture?
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
Name the following:
Name two metals always find in combined state.
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Usually ______ ores are subjected to ______ which is done in the absence of air.
Extraction of moderately reactive elements is done by _______ and _______ method.
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Find the odd one out and give its explanation.
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.
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
