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Ask QuestionPosted by Srishti Maurya 6 years, 7 months ago
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Gaurav Seth 6 years, 7 months ago
Molal depression constant is defined as the depression in freezing point produced when 1 mole of solute is dissolved in one kg (1000 g) of the solvent.
Posted by Deepanjan Mukherjee 6 years, 7 months ago
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Sinchana Malagond 6 years, 7 months ago
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Hritik Kumar 6 years, 7 months ago
Gursharn Kaur 6 years, 7 months ago
Posted by Ms Pankaj 6 years, 7 months ago
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Gaurav Seth 6 years, 7 months ago
Zone refining: The method is based on the principle that the impurities are more soluble in the melt than in the solid state of the metal. A circular mobile heater is fixed at one end of a rod of impure metal. The molten zone moves along with the heater which is moved forward. As the heater moves forward, the pure metal crystallizes out of the metal and the impurities pass on into the adjacent molten zone. The process is repeated several times and the heater is moved in the same direction. At one end impurities get con-centrated. This end is cut off. In this way, the impu-rities are swept from one end of the bar to the other. By repeating the process, ultra pure metal of silicon, germanium etc are obtained.
Zone Refining Process
Posted by Gudda Kapil 6 years, 7 months ago
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Gaurav Seth 6 years, 7 months ago
There are two main reasons for the stability of colloidal sols:
Solvation: Colloidal particles are covered by a sheath of liquid in which they are extensively solvated, thereby providing stability.
Electrostatic stabilisation: Presence of equal and similar charges on the colloidal particles prevents coagulation of the colloidal sol.
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Gursharn Kaur 6 years, 7 months ago
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Posted by Anushka Choudhary 6 years, 7 months ago
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Yogita Ingle 6 years, 7 months ago
Raoult’s law
- Raoult’s law establishes a quantitative relationship between the partial vapour pressure and mole fraction of a solution.
- This law is only for liquid-liquid solution.
- The law states that for a solution of volatile liquids, the partial vapour pressure (p) of each component in the solution is directly proportional to its mole fraction (x).
- Mathematically, p ∝ x
Or p = p 0x
Where p0 is the vapour pressure of pure component at the same temperature.
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Yogita Ingle 6 years, 7 months ago
Promoters: Those substances which increase the activity of catalyst are called promoters. Example: Mo is promoter whereas Fe is catalyst in Haber’s Process.
Catalytic poisons (Inhibitors): The substances which decrease the activity of catalyst are called catalytic poisons or inhibitors e.g., arsenic acts as catalytic poison in the manufacture of sulphuric acid by ‘contact process.
Posted by Aman Sharma 6 years, 7 months ago
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Yogita Ingle 6 years, 7 months ago
Chloroform is slowly oxidised by air in the presence of light to an extremely poisonous gas, carbonyl chloride, also known as phosgene. It is therefore stored in closed dark coloured bottles completely filled so that air is kept out.
2CHCl3 + O2 → 2HCl + 2 COCl2
Dr. Dashrath Kumar Hinunia 6 years, 7 months ago
Posted by Abhishek Kumar 6 years, 7 months ago
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Yesaswipavani Burada 6 years, 7 months ago
The carbonyl group of aldehyde is commonly represented as _CHO
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Srishti Maurya 6 years, 7 months ago
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