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प्रश्न
Name the following:
Main ore of aluminium.
Name the ore for aluminium.
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उत्तर
Bauxite (Al2O3.nH2O) is the main ore of aluminium.
संबंधित प्रश्न
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Name the most abundant metal in the earth's crust.
Explain why, carbon cannot reduce oxides of sodium or magnesium.
How is zinc extracted from its carbonate or (calamine)? Explain with equations.
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
Name the chemical compound which is electrolysed in molten state to obtain sodium metal. Which gas is produced in this process?
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
How is copper extracted from its sulphide ore (copper glance), Cu2S? Explain with equations of the reactions involved.
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
The metal which can be extracted from the bauxite ore is:
(a) Na
(b) Mn
(c) Al
(d) Hg
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
Which metal can be extracted from the following ore?
Calamine
Which metal can be extracted from the following ore?
Haematite
Give the principles of electromagnetic separation.
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
Name the following:
Name two metals always find in combined state.
What is meant by concentration of ores?
What is galvanized iron.
Complete the incomplete statement with missing word:
Metals form positive ions while non- 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.
Which one of the following is not true of metal :
Metals are malleable and ductile
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Zinc blende is converted to oxide by ______ process.
What is the difference between calcination and roasting?
Atomic number of aluminium is _______ and its electronic configuration is _______.
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.
Dry aluminium hydroxide is ignited at 1000 °C
Explain concept with example/explain with the help of a balanced equation.
Ionic bond and ionic compounds
Explain concept with example/explain with the help of a balanced equation.
Calcination
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.
Which of the following ore is concentrated by the Froth floatation process?
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
