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प्रश्न
Name the following:
Main ore of aluminium.
Name the ore for aluminium.
Give one word for the following:
An ore of aluminium.
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उत्तर
Bauxite (Al2O3.nH2O) is the main ore of aluminium.
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संबंधित प्रश्न
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.
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
Name the gas in air which tarnishes silver articles slowly.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Why does a new aluminium vessel lose shine so soon after use?
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
Fill in the following blank with suitable word:
Bronze is an alloy of copper and .........
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
Give the name and chemical formula of one ore of copper.
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
How is aluminium metal extracted? Explain with the help of an equation.
Name the electrode at which aluminium metal is produced.
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
The metal which is always present in an amalgam is:
(a) iron
(b) aluminium
(c) mercury
(d) magnesium
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
Aluminum is used in thermite welding:
what is thermit?
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
Compare the process of calcination and roasting.
Which method of refining is used to get 99.8% pure aluminium?
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
Name : The metal which is liquid at room temperature.
How many valence electrons are present in metals ?
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Define calcination.
Write the name.
The process of extraction of aluminium from alumina-
Gold and silver are active metals.
Write the molecular formulae of the following compound.
Fluorspar
Complete flow chart given below.
Read the following passage and answer the questions.
According to the reactivity series, zinc is more reactive than iron, iron is more reactive than silver. During study of this, a student dipped the iron nails in silver nitrate solution.
- What is reactivity series?
- What will happen when iron nails are dipped in silver nitrate solution?
- Which type of reaction happens when iron metal reacts with silver nitrate solution?
- What will happen if a zinc rod is used instead of iron nail?
The poorest conductor of heat among metals is ____________.
