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Indian Navy 10+2 B.Tech Cadet Thermal Properties of Matter — practice questions

Explore 2 free Thermal Properties of Matter questions in Indian Navy 10+2 B.Tech Cadet Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Thermal Properties of Matter questions and exercises with answers

Showing questions 1–2 of 2.

As per your syllabus, the Δ_f H° of C(diamond) is which value (note: NOT zero, because graphite — not diamond — is the reference state of carbon)?Read the answer and worked solution →As per your syllabus, a reaction with ΔH < 0 AND ΔS > 0 is spontaneous under which condition?Read the answer and worked solution →

Worked practice questions

As per your syllabus, the Δ_f H° of C(diamond) is which value (note: NOT zero, because graphite — not diamond — is the reference state of carbon)?

  1. −393.5 kJ/mol
  2. +1.89 kJ/mol
  3. +393.5 kJ/mol
  4. 0 kJ/mol
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Correct answer: B. +1.89 kJ/mol

As per your syllabus, C(graphite) = 0 (reference). C(diamond) = +1.89 kJ/mol — slightly less stable than graphite.

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As per your syllabus, a reaction with ΔH < 0 AND ΔS > 0 is spontaneous under which condition?

  1. Only at low T
  2. At ALL temperatures
  3. Only at high T
  4. Never
Show answer and solution

Correct answer: B. At ALL temperatures

As per your syllabus, ΔH(−) + ΔS(+) ⇒ ΔG = ΔH − TΔS is always negative ⇒ spontaneous at all T.

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