Multiple choice

Which of the following statement is TRUE?

  1. SnCl2 is more covalent than SnCl4.

  2. Red phosphorus shows chemiluminescence.

  3. Oxygen shows only - 2 oxidation state.

  4. Argon constitutes 1.288 percent of the atmosphere by volume.

  5. Ozone is thermodynamically unstable with respect to oxygen.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Ozone is thermodynamically unstable with respect to oxygen since its decomposition into oxygen results in the liberation of heat (ΔH is -ve) and an increase in entropy (ΔS is +ve). These two effects reinforce each other, resulting in large negative Gibbs energy change (ΔG) for its conversion into oxygen.

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