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Subject - Chemistry:

Basics

MCQ - 23-2209

Question:

Which of the following is true about C (diamond) → C (graphite) ∆H = -3 kJ mol-1¬?

  1. Both diamond and graphite have tetrahedral configuration.
  2. Both diamond and graphite have covalent bonds and van der Walls’ forces.
  3. The change from diamond to graphite occurs spontaneously.
  4. Both diamond and graphite have covalent bonds and van der Walls’ forces.

Correct Answer: C

Explanation:

(C) (diamond) → C(graphite) - is a physical change, not chemical.

It requires a negative change in enthalpy (ie an exothermic reaction) and/or a positive change in the entropy. The conversion of diamond into graphite is thermodynamically favored. The speed of this reaction is just too darn incredibly slow for a diamond to turn into graphite. In anyone's lifetime or perhaps even the lifetime of planet Earth.

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645 MCQ for effective preparation of the test of Basics of Chemistry section.

Read the MCQ statement: Which of the following is true about C (diamond) → C (graphite) ∆H = -3 kJ mol-1¬? , keenly and apply the method you have learn through the video lessons for Basics to give the answer. Record your answer and check its correct answer and video explanation for MCQ No. 23-2209.

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