Competitive Exams: Chemistry MCQs (Practice-Test 22 of 31)

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  1. Uranium-235 decays via a sequence of seven alpha decays and four beta decays to produce a stable nuclide. Which of the following is the nuclide that is produced?

    1. tungsten-207

    2. lead-207

    3. actinium-235

    4. proactinium-219

    5. uranium-238

  2. The half-life of tritium is 12.3 years. If 48.0 mg of tritium is released from a nuclear power plant during the course of an accident, calculate the mass (in mg) of the nuclide that will remain after 5.0 years.

  3. Nuclides that have neutron-to-proton ratios that are too HIGH (compared with stable nuclides) are expected to undergo:

    1. alpha decay.

    2. beta decay.

    3. positron decay.

    4. electron capture.

    5. none of the above:

  4. Radon-222 is a potentially serious problem in many homes. From which of the following naturally-occurring nuclides is radon-222 produced?

    1. carbon-12

    2. potassium-40

    3. iron-56

    4. thorium-232

    5. uranium-238

  5. Consider the following types of medical procedures

    1. PET (Positron Emission Tomography) scan

    2. CAT (Computerized Axial Tomography) scan

    3. MRI (Magnetic Resonance Imaging) scan

    4. Iodine-131 treatment of hyperthyroidism

    Which of these procedures involves X-rays?

    1. 1 and 3

    2. 2 and 4

    3. 3 and 4

    4. 1 only

    5. 2 only