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Indian Navy 10+2 B.Tech Cadet Thermodynamics — practice questions

Explore 3 free Thermodynamics 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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Thermodynamics questions and exercises with answers

Showing questions 1–3 of 3.

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 →Entropy — true or false?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
Show answer and solution

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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Entropy — true or false?

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Questions
  1. Statement is true
    Yes
    Statement
    Entropy of the universe always increases in a spontaneous process.
  2. Statement is true
    Yes
    Statement
    Entropy of a perfect crystal at 0 K is zero (3rd law).
  3. Statement is true
    No
    Statement
    Liquid water has lower entropy than ice at the same temperature.
  4. Statement is true
    No
    Statement
    Mixing two ideal gases decreases entropy.
  5. Statement is true
    Yes
    Statement
    Entropy is a state function.

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