Q25 / 150 · MHT CET 2023 (09 May Shift 2) · Chemistry

Identify the CORRECT decreasing order of melting point of cluster of sodium atoms depending on size.

  • A
    Cluster of $10^3$ atoms $>$ cluster of $10^4$ atoms $>$ Bulk sodium
  • Correct answer
    B
    Bulk sodium $>$ cluster of $10^4$ atoms $>$ Cluster of $10^3$ atoms
  • C
    Cluster of $10^4$ atoms $>$ Cluster of $10^3$ atoms $>$ Bulk sodium
  • D
    Bulk sodium $>$ cluster of $10^3$ atoms $>$ Cluster of $10^4$ atoms

Solution

Sodium clusters $\left(\mathrm{Na}_{\mathrm{n}}\right)$ of 1000 atoms melts at $288 \mathrm{~K}$ while cluster of 10,000 atoms melts at $303 \mathrm{~K}$ and bulk sodium melts at $371 \mathrm{~K}$.

Hence, the correct answer is option: 'B'.

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