1.

Which of the following is/are not true

Answer»

<P>The most radioactive ELEMENT present in PITCHBLENDE is uranium
`P - 32` is used for the treatment of leukaemia
`CO_(2)` present in the air contains `C - 12` only
Emission of `gamma`- rays changes the MASS number but not atomic number

Solution :(a) Is not true because most radioactive element present in pitchblende is Radium.
(c) Is not true because `CO_(2)` in the air contains `C - 12` as well as `C - 14`
(d) Is not true because emission of `gamma-` rays, neither changes mass number nor atomic number


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