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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
Which of the following pairs will give displacement reactions?
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.
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
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 |
What is meant by the ‘concentration of ore’?
Which metal is extracted from cinnabar ore?
Zinc blende ore can be converted into zinc oxide by the process of ______.
A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X.
- Name the metal X.
- Name the metal oxide XO2.
- Which reducing agent can be used to reduce XO2 to obtain metal X?
- Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
Give reasons, why aluminum is used in:
In aluminiothermy
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
Define the term:
Flux
Which method of refining is used to get 99.8% pure aluminium?
Usually ______ ores are subjected to ______ which is done in the absence of air.
Write the molecular formulae of the following compound.
Cryolite
Write the molecular formulae of the following compound.
Fluorspar
Explain the concept of Calcination.
Explain the characteristics of ionic compounds.
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
