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Assertion:Isotopes of an element can be separated by using a mass spectrometer. Reason: Separation of isotopes is possible because of difference in electronnumber of isotopes .

Answer»

If both assertion and reason are true and reason is the correct explanation of assertion .
If both assertion and reason are true but reason is notthe correct explanation of assertion .
If assertion is true but reason is false .
If both assertion and reason are false

Solution :Number of electrons in isotopes of an element is same. If two atoms have the same number of protons but different number of neutrons , their atomic (proton) numbers are equal but not their mass (nucleon) numbers. In mass spectrograph, the deflecting electric and magnetic fields were ARRANGED so that all particles of the same mass , irrespective of their speed , were brought to a line FOCUS. When IONS of different mass were present , a series of lines, i.e., a mass spectrum , obtained on a photographic film. The relative intensities of the lines enabled an estimate to be made of the relative amounts of isotopes.


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