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Which of the following is/are not trueA. The most radioactive element present in pitchblende is uraniumB. `P - 32` is used for the treatment of leukaemiaC. `CO_(2)` present in the air contains `C - 12` onlyD. Emission of `gamma`- rays changes the mass number but not atomic number |
Answer» Correct Answer - A::C::D (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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