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प्रश्न
Aluminium oxide is _______ oxide.
विकल्प
acidic
basic
neutral
amphoteric
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उत्तर
Aluminium oxide is amphoteric oxide.
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संबंधित प्रश्न
Name the following:
Main ore of aluminium.
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?
The process by which sulphide ore is concentrated.
Fill in the following blank with suitable word:
The non-metal present in steel is ............
What is meant by the 'concentration of ore'?
Rock salt is an ore of one of the following metals. This metal is:
(a) Mn
(b) Na
(c) Fe
(d) Cu
Give the principles of electromagnetic separation.
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?
What is meant by refining of metals? Name the three common methods used for refining.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
Which of the following ore is concentrated by the Froth floatation process?
- Given below are the steps for extraction of copper from its ore. Write the reaction involved.
- Roasting of copper (I) sulphide
- Reduction of copper (I) oxide with copper (I) sulphide.
- Electrolytic refining
- Draw a neat and well labelled diagram for electrolytic refining of copper
