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Q. What are polar molecules? Give an example.
i) A polar molecule is one in that the centre of gravity of the positive charges is separated from the centre of gravity of the negative charges by a finite distance.
ii) Instance: N2O, H2O, HCl, NH3.
iii) They have an eternal dipole moment.
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Why diffraction can't occur if slit width is less than the wavelength of the light? Can you explain?
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why an electron can''t exist in the nucleus .
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