Скачать или смотреть Why conductivity of metal decreases with the increases in temperature & increases for semiconductor

This video lecture from the class 12 chemistry tells you how conductivity of semiconductor increases and the conductivity of metal decreases with the increase in temperature.
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F.Sc. part 2 Chapter 3 Full Notes
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Why boron is non-metals?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
Boron 3+ ion doesn't exist but Al 3+ ion does exist
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
Give the names and important formulas for minerals of boron.
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
How borax is prepared from sodium carbonate?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
How does the solubility of borax change with a change in temperature?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
How the temperature influences the water of crystallization of borax.
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is the action of an aqueous solution of borax on Litmus and why it's aqueous solution is alkaline?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
Convert borax into boron nitride.
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is the effect of heat on borax.
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
How borax bead test is performed
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is the chemistry of the borax bead test?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is sodium silicate or water glass give its uses?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is the effect of heat on orthoboric acid
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
Why aluminium vessels are not washed with alkalies
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
How aluminium becomes water-soluble by using sodium hydroxide.
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
How Al is used to removing air bubbles from the molten metal.
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is the utility of the reaction when aluminium reacts with oxygen?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
Why CO2 is gas and silicon dioxide is solid at room temperature?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
Why CO is polar while CO2 is non-polar.
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is quartz give its properties?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is silica gel or fuse quartz
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is sodium silicate or water glass Give its uses?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is a chemical garden?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
Give the formula talc or soapstone give its properties and uses
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is Asbestos, give its uses.
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What are silicones?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
Silicones are better lubricants as compared to petroleum oil why? OR what is the effect of temperature upon the viscosity of silicones?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What Are Semiconductors?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
Why semiconductors are named so?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
How does Borax serve as a water softening agent?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
Why aluminium does not react with nitric acid.
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is chrome yellow Give its use
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
Write down names and chemical formulas of two common minerals of carbon.
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
What is the effect of temperature on semiconductors
   • Class 12 Ch#3  (Group III-A & IV-A elements)  
Why conductivity of metals decreases by increasing temperature while the conductivity of semiconductors increases by increasing temperature?
   • Class 12 Ch#3  (Group III-A & IV-A elements)  

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