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BITSAT 2009
Exam
BITSAT
Year
2009
Subject
Chemistry
Chapter
Thermodynamics (C)

BITSAT 2009 · Chemistry · Thermodynamics (C)

At 25^ ^ C and 1 bar which of the following has a non-zero Δ H_ ^ ^...

At 25∘C25^{{}^{\circ}} \mathrm{C} and 1 bar which of the following has a non-zero \Delta \mathrm{H}_{\mathrmf^{{}^{\circ}} ?

Options

  1. ABr⁡2(ℓ)\operatorname{Br}_{2}(\ell)
  2. BC (graphite)
  3. CO3(g)\mathrm{O}_{3}(\mathrm{ g})
  4. DI2(s)\mathrm{I}_{2}(\mathrm{ s})

Correct answer

C. O3(g)\mathrm{O}_{3}(\mathrm{ g})

Step-by-step solution

Ozone is allotropic form of oxygen and is of higher energy (by 68K68 \mathrm{ K} Cal mol ^{-1})thanO2) than \mathrm{O}_{2}. Hence it can not be taken as the reference in standard state.
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