Question:

Enriched uranium, used in a nuclear reactor, is

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Think \textbf{isotopes}: Enrichment = \(\uparrow\,\mathrm{^{235}U}\) percentage.
Updated On: Aug 12, 2025
  • uranium freed of all impurities
  • uranium treated with radiation
  • uranium mixed with isotopes
  • uranium alloy with aluminium
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The Correct Option is C

Solution and Explanation

Precise meaning: Enrichment raises the concentration of fissile \(\mathrm{^{235}U}\) in natural uranium from \(\sim 0.7%\) to a higher percentage (e.g., 3–5% for light-water reactors). Technically, you are {altering the isotopic mix}—increasing \(\mathrm{^{235}U}\) relative to \(\mathrm{^{238}U}\).
Options check: (c) best matches the isotopic idea (though loosely worded). (a) is merely purification; (b) “treated with radiation” is meaningless in this context; (d) an alloy is not what reactors need.
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