NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Chemistry MCQs (Practice_Test 27 of 31)
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- 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?
- 1,2 and 3
- 2 and 3
- 3,4 and 5
- 1,4 and 5
- 2,4 and 5
- Four types of radiation arranged in order from lowest to highest health hazard is:
- gamma rays < alpha particles < beta particles < neutrons
- alpha particles < gamma rays < neutrons < beta particles
- beta particles < alpha particles < gamma rays < neutrons
- neutrons < alpha particles < gamma rays < beta particles
- gamma rays < beta particles < neutrons < alpha particles
- Write a chemical equation for each of the following radioactive decay processes:
- phosphorus-32 decays by beta-particle emission.
- lithium-8 decays by beta-particle emission followed by alpha-particle emission.
- potassium-40 decays by electron capture.
- nitrogen-13 decays by positron emission.
- thorium-232 decays by alpha-particle emission.
- Calculate the binding energy per nucleon in millions of electron volts for magnesium-27. The atomic mass of magnesium-27 is 26.9843 amu.
- Consider the following information:
- The layer of dead skin on our bodies is sufficient to protect us from most alpha-particle radiation.
- Plutonium is an alpha-particle producer.
- The chemistry of Pu4 + is similar to that of Fe3 + .
- Pu4 ++ 4 e________ > Pu, Eo =-1.28 V
Using this information, explain why plutonium is one of the most toxic substances known.