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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.
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.
How many carats is pure gold? Why is pure gold not suitable for making ornaments?
Name the gas in air which tarnishes silver articles slowly.
Why does a new aluminium vessel lose shine so soon after use?
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
Define the term mineral.
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
Aluminum is used in thermite welding:
what is ignition mixture?
Answer the following question :
What is the difference between calcination and roasting.
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as ______.
Name the methods by which concentrated ore is converted to metallic oxide.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Extraction of moderately reactive elements is done by _______ and _______ method.
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Right or wrong sentence?
The electrolysis of alumina combines fluorite and cryolite to increase the solubility in the precipitation method.
Complete flow chart given below.
Observe the following diagram and write answers.
- Name the method.
- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
In thermite welding a mixture of ____________ is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
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 the reason why the above reaction is known as a thermite reaction.
