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Chemistry · EQUILIBRIUM

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Radioactive sugar is added to a saturated aqueous solution of non-radioactive sugar that is in contact with undissolved solid sugar crystals at constant temperature. After some time, radioactivity is detected in both the solution and the solid sugar. What does this observation directly prove?

  1. The solubility of sugar increases due to radioactive emissions.
  2. Equilibrium between dissolution and crystallisation is dynamic in nature.
  3. Dissolution of sugar is an irreversible physical process.
  4. Radioactive sugar molecules have a significantly higher rate of dissolution than non-radioactive ones.

Correct answer · Option 2

Equilibrium between dissolution and crystallisation is dynamic in nature.

Explanation

The presence of radioactivity in both phases confirms that molecules continually transfer between solid and solution phases at equal rates, demonstrating dynamic equilibrium.

Related questions

Given below are two statements:\n Statement I: Chemical equilibrium can be attained from either direction, whether starting with pure reactants or pure products.\n Statement II: The Law of Chemical Equilibrium and Law of Mass Action was proposed by Cato Maximillian Guldberg and Peter Waage in 1864. \nIn the light of the above statements, choose the most appropriate answer from the options given below:→For a 0.10 M aqueous solution of a diprotic acid \( \text{H}_2\text{X} \), the ionization constants are \( K_{a_1} = 4.0 \times 10^{-5} \) and \( K_{a_2} = 1.6 \times 10^{-11} \). The concentration of divalent anion \( [\text{X}^{2-}] \) at equilibrium is:→When \( \text{HCl} \) gas is passed through a saturated solution of \( \text{NaCl} \), pure \( \text{NaCl} \) precipitates out while impurities like \( \text{MgSO}_4 \) and \( \text{Na}_2\text{SO}_4 \) remain dissolved. The underlying reason for this phenomenon is:→In the equilibrium \( \text{Fe}^{3+}(\text{aq}) + \text{SCN}^-(\text{aq}) \rightleftharpoons [\text{Fe}(\text{SCN})]^{2+}(\text{aq}) \) (deep red), what happens to the red colour intensity upon the addition of oxalic acid \( (\text{H}_2\text{C}_2\text{O}_4) \) and why?→
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