If 75% of any given amount of radioactive element disintegrates in 60 min. The half life of radioactive element is. A. 20 min B. 30 min C. 45 min D. 25 min Right Answer: B. 30 min Share : December 16, 2017 Hassan Ali Chemistry Total 0 Votes: 0 0 Tell us how can we improve this Mcqs? Captcha: + = Verify Human or Spambot ? Related Mcqs Check Below -Magnesium metal is extracted by the electrolysis of itsWhich of the following statements is not correct?The main cause of ozone depletion is?