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  4. 19K40, 18Ar40, 20Ca40 are:

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Q. $ _{19}{{K}^{40}},{{\,}_{18}}A{{r}^{40}},{{\,}_{20}}C{{a}^{40}} $ are:

Rajasthan PMTRajasthan PMT 1997

Solution:

Which have same atomic weight and different atomic number is known as isobar.