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Ask QuestionPosted by Abhinav Tripathi 6 years, 9 months ago
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Posted by Govind Kumar 6 years, 9 months ago
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Gaurav Seth 6 years, 9 months ago
According to Bohr's theory:
(i) The atom consists of a small (positively charged) nucleus at its centre.
(ii) The whole mass of the atom is concentrated in the nucleus and the volume of the nucleus is smaller than the volume of the atom by a ratio of about 1 : 105.
(iii) All the protons and neutrons of the atom are contained in the nucleus.
(iv) The electrons of the atom revolve around the nucleus in definite circular paths known as orbits or which are designated as K, L, M, N etc. or numbered as (n) = 1, 2, 3, 4 etc. outward from the nucleus.
(v) Each orbit is associated with a fixed amount of energy. Therefore, these orbits are also known as energy levels or energy shells.
(vi) The energy of the atom changes when an electron jumps from one state (energy level) to another state (energy level). As long as an electron remains in a particular orbit, it does not lose or gain energy.
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Gaurav Yadav 6 years, 9 months ago
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Yogita Ingle 6 years, 9 months ago
Depression of freezing point
- Freezing point of a substance is the temperature at which the vapour pressure
of the substance in its liquid phase is equal to the vapour pressure in the solid phase. - If the vapour pressure of the solution is equal to the vapour pressure of the pure solid solvent then the solution freezes.
- According to Raoult’s law, addition of non-volatile solute decreases the vapour pressure of the solvent and would be equal to that of solid solvent at lower This decreases the freezing point of thesolvent.
- The decrease in the freezing point = ΔTf = Tf – Tf0. This is known as depression in freezing point.
Tf0 = freezing point of pure solvent
Tf0 = freezing point when non-volatile solute is dissolved
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Adrija Pal ? 6 years, 9 months ago
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Gaurav Seth 6 years, 9 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.
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Shaurya Omar 6 years, 9 months ago
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Adrija Pal ? 6 years, 9 months ago
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Gaurav Seth 6 years, 9 months ago
A mixture of equal amounts of two enantiomers is known as racemic mixture. For example: When a 3° halide undergoes substitution with KOH, the reaction proceeds through SN 1 mechanism forming the racemic mixture in which one of the products has the same configuration as a reactant, while the other product has an inverted configuration.
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Yogita Ingle 6 years, 9 months ago
Solids have strong intermolecular forces of attraction. The constituent particles of solids cannot move from their positions they can only vibrate from their mean positive. That is why do solids have a definite volume.
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Ayush Verma 6 years, 9 months ago
1Thank You