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[" 10) The half-life of a radioactive su...

[" 10) The half-life of a radioactive substance is "],[30" minutes.The time (in minutes) taken "],[" between "40%" decay and "85%" decay of the "],[" same radioactive substance is "],[[" (a) "15," (b) "30," (c) "45," (NEET-I "2016)]]

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