Actinides: Occurrence, Abundance & Preparation: 19 MCQs
All 19 multiple-choice questions from this kit, free and with no sign-up.
Warm-up · 8 questions
Q1. Which orbitals are progressively filled across the actinide series?
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Q2. The name 'actinide' is derived from which element?
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Q3. A sample of natural uranium is analysed. Which isotope is present in the greatest abundance?
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Q4. What is the approximate half-life of $^{232}$Th?
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Q5. Which set correctly lists the actinides that occur naturally in appreciable amounts?
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Q6. Elements with atomic number greater than 92 are collectively known as:
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Q7. Which ore is the most important source of uranium and consists of $\text{UO}_2$ or $\text{U}_3\text{O}_8$?
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Q8. Uranium-238 (~99.28% of natural uranium) and thorium-232 (half-life ~14 billion years) are the long-lived parent nuclei of natural radioactive decay series.
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Building up · 6 questions
Q9. Which statement best explains why actinide chemistry is more variable than lanthanide chemistry?
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Q10. Which naturally occurring actinide isotope is fissile and present at roughly 0.7% in natural uranium?
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Q11. A mineral sample is a yellow uranium–vanadium ore found in sedimentary rocks. Which mineral is it?
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Q12. Which mineral is a green hydrated phosphate of uranium and copper?
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Q13. Which mineral is a phosphate rich in rare earth elements and thorium, making it a source of both lanthanides and thorium?
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Q14. Which method is NOT used to prepare naturally occurring actinides from their minerals?
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Topper level · 5 questions
Q15. Trace amounts of neptunium and plutonium found in uranium ores arise mainly from:
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Q16. Which statement about the synthesis of actinides is correct?
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Q17. Given the natural abundance of actinides, which of the following statements accurately describes the occurrence of actinides in the Earth's crust?
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Q18. Which of the following methods is primarily used to extract naturally occurring actinides from their ores?
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Q19. If a sample of uranium ore contains 99.28% of $^{238}$U, what is the expected percentage of the fissile isotope $^{235}$U in the same sample, and how does this relate to the natural decay series?
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