Competitive Exams: Chemistry MCQs (Practice-Test 27 of 31)

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  1. Which of these diagnostic procedures involves radioactive decay of an unstable nuclide as the primary means for creating an image of the area of the body being studied?

    1. 1, 2 and 3

    2. 2 and 3

    3. 3, 4 and 5

    4. 1, 4 and 5

    5. 2, 4 and 5

  2. Four types of radiation arranged in order from lowest to highest health hazard is:

    1. gamma rays < alpha particles < beta particles < neutrons

    2. alpha particles < gamma rays < neutrons < beta particles

    3. beta particles < alpha particles < gamma rays < neutrons

    4. neutrons < alpha particles < gamma rays < beta particles

    5. gamma rays < beta particles < neutrons < alpha particles

  3. Write a chemical equation for each of the following radioactive decay processes:

    1. phosphorus-32 decays by beta-particle emission.

    2. lithium-8 decays by beta-particle emission followed by alpha-particle emission.

    3. potassium-40 decays by electron capture.

    4. nitrogen-13 decays by positron emission.

    5. thorium-232 decays by alpha-particle emission.

  4. Calculate the binding energy per nucleon in millions of electron volts for magnesium-27. The atomic mass of magnesium-27 is 26.9843 amu.

  5. Consider the following information:

    1. The layer of dead skin on our bodies is sufficient to protect us from most alpha-particle radiation.

    2. Plutonium is an alpha-particle producer.

    3. The chemistry of Pu4 + is similar to that of Fe3 +.

    4. Pu4 + + 4 e____> Pu, Eo = -1.28 V

Using this information, explain why plutonium is one of the most toxic substances known.