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Condensation with formaldehyde - Miscellaneous reactions
Phenol condenses with formaldehyde (excess) in presence of sodium hydroxide or acid (H+) for about a week to form a polymer known as bakelite (a resin).
1 gram of pure sodium carbonate is dissolved in water and the solution is made up to 50 ml of this solution 50 ml of 0.1 N HCl is added whose volume is 50 ml and the mixture furthe
Uses of Nitro alkanes or Nitroparaffins (1) Nitro alkanes are used as solvents for polar substances such as cellulose acetate, synthetic rubber etc. (2) Nitro alkanes are us
Hedonic Rating In this test the assessor is asked to record the extent of liking for a product, usually by selecting a category on a "hedonic" or liking scale that runs from
What is piezoelectricity Piezoelectricity provides us a means of converting electrical energy to presume new geometric positions and mechanical dimensions of the substance are
Till 20elememts write the no of electrons in outermost shell.if less than 4 then this is the valency otherwise subtract from 8
Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is: (1) 4 Π mr 2 / nh (2) nh/ 4Π 2 mr (3) nh/ 4Π 2 mr 2
what is the difference between both independent and dependent variables?
How can we calculate the rate of effusion of nitrogen gas from a cylinder and How much time it will take?? Ans) rate of effusion=r=(volume of nitrogen gas effusing from the cyl
The postulate of Bohr theory that electrons jump from one orbit to the other, rather than flow is according to : (1) The quantisation concept (2) The wave nature of elect
The frequency of an electromagnetic radiation is 2x 10 6 Hz. . What is its wavelength in metres : (Velocity of light = 3x10 8 ms -1 ) (1)6.0x 10 14
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