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Explain the characteristics of ionic compounds. - Science and Technology 1

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प्रश्न

Explain the characteristics of ionic compounds.

संक्षेप में उत्तर

उत्तर

  1. Physical nature: Ionic compounds are solids and are hard. They are generally brittle and break into pieces when pressure is applied.
  2. Melting and boiling points: Ionic compounds have high melting and boiling points.
  3. Solubility: Ionic compounds are generally soluble in water. However, they are insoluble in kerosene and petrol.
  4. Electrical conductivity: Ionic compounds conduct electricity in a molten state or in its aqueous solution. Conduction of electricity in these states is due to the movement of charged particles (i.e., ions) towards the oppositely charged electrodes. However, in solid-state, ionic compounds do not conduct electricity as movement of the ions is not possible due to their rigid structure.
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अध्याय 8: Metallugy - Solve the following Questions

संबंधित प्रश्न

The process by which sulphide ore is concentrated.


How many carats is pure gold? Why is pure gold not suitable for making ornaments?


How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.

 

Give the name and chemical formula of one ore of copper.


A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.


Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.


Explain given equation, what happens when ZnCO3 is heated in the absence of air?


How is sodium metal extracted? Explain with the help of equation of the reaction involved.


Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.


Aluminum is used in thermite welding:

write reaction for process?


State one observation for each of the following  : 
Copper sulphate solution is electrolysed using copper electrodes. 


What is meant by refining of metals? Name the three common methods used for refining.


The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.


Name a non- metal that has a metallic luster and sublimes on heating.


Which one of the following is not true of metal :
 Metals are malleable and ductile


How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can the same process not be applied for them? Name the process used for the extraction of these metals.


Atomic number of aluminium is _______ and its electronic configuration is _______.


Extraction of moderately reactive elements is done by _______ and _______ method.


Gold and silver are active metals.


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. 


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