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Name the Chemical Compound Which is Electrolysed in Molten State to Obtain Aluminium Metal. Which Gas is Evolved During this Process? - Science

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प्रश्न

Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?

उत्तर

 Aluminium oxide is electrolysed in molten state to obtain aluminium metal. Oxygen gas is evolved during this process

The equation for this decomposition is:

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अध्याय 3: Metals and Non-metals - Exercise 3 [पृष्ठ १९३]

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लखमीर सिंग Chemistry (Science) [English] Class 10
अध्याय 3 Metals and Non-metals
Exercise 3 | Q 55.1 | पृष्ठ १९३

संबंधित प्रश्न

In the extraction of aluminium: Why is it necessary to replace anodes time to time?


Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.


Explain givem equation, what happens when a mixture of Cu2O and Cu2S is heated?


Which metal is extracted from cinnabar ore?


Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.


Write equations for each of the above metal which reacts with water.


Name:
The allotrope of the non-metal carbon which conducts electricity.


Write the name.

The molecular formula of main ore of aluminium –


On the basis of reactivity metals are grouped into three categories: 

  1. Metals of low reactivity
  2. Metals of medium reactivity
  3. Metals of high reactivity

Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.

Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.

Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.

(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.

(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?

(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.

                                     OR

(c) Differentiate between roasting and calcination giving chemical equation for each. 


Care must be taken while diluting concentrated nitric acid with water. Why?


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