Question

MCQ : Which of the following contains the least number of molecules?

  • Chemical Calculations
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Answer

Question

Which of the following contains the least number of molecules?

  1. 1.12 L SO2 at STP
  2. 1 gm-mole SO2
  3. 32 g SO2
  4. 4 × 1023 molecules of SO2

Answer

(a) 1.12 L SO2 at STP

Explanation

  • 12 L SO2 at STP ≈ 2.65 × 1023 molecules
  • 1 gm-mole SO2 = 6.02 × 1023 molecules
  • 32 g SO2 = 6.02 × 1023 molecules
  • 4 × 1023 molecules of SO2 = 4 × 1023 molecules

Among the given options, “4 × 1023 molecules of SO2” contains the least number of molecules.

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