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  4. Out of the following radioactive substances which are not found in naturally on carth? (i) Tritium (ii) Deuterium (iii) Uranium (iv) Plutonium

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Q. Out of the following radioactive substances which are not found in naturally on carth?
(i) Tritium
(ii) Deuterium
(iii) Uranium
(iv) Plutonium

Nuclei

Solution:

Correct answer is (c) (i) and (iv)