1.

Which of the following is/are not ture?

Answer»

The most radioactive elementpresent in pitchblende is uranium
`.^(32)P` is USED for the treatment of LEUKAEMIA.
`CO_(2)` present in the air contains `.^(12)C` only
Emission of `gamma`-rays changes the mass number but not atomicnumber.

Answer :a,d


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