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Determine the first three energy levels 3 of an electron confined to a one dimensional box of length of 10-9 M.
State the postulates of Bohr's atomic model.
Compound X exhibits molar extinction coefficient of 245 m2mol at 450 nm. What concentration of X in a solution will cause a 25% decrease in the intensity of 450 nin radiation when the solution is placed in a 0.01 m absorption cell ?
State Beer-Lambert Law.
What are radioactive tracers ? Give any two examples.
Explain the structure of the following molecules on the basis of USEPR theory: ClF. and PF3.
Write down the resonating structures of carbonate ion.
Determine the bond order for 02 and 02
2
and indicate their magnetic behaviour.
Calculate the frequency of the radiation required to eject photoelectrons to a velocity of 9 X105 MS-1 from sodium metal surface, having a threshold frequency of 4.61 x 1014 Hz (mass of photoelectron = 9.109 x 10 -31 kg).
Give the electronic configuration of A13+ and S2- ions.
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