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MCQ practice · SSC Chemistry Board questions · Chapter 8: Chemistry and Energy

Cumilla Board 2025

What is the bond energy of Cl − Cl in kJ/mol?

Think it through first, then pick an option.

  1. a 244
  2. b 193
  3. c 151
  4. d 143
Answer and explanation

Correct answer: a 244

By Table 8.01 the Cl-Cl bond energy is 244 kJ/mol.

Why the other options are wrong

  • b 193: 193 is Table 8.01's Br-Br value, easy to mix up as they sit close; Cl-Cl is 244.
  • c 151: 151 is Table 8.01's I-I value, easy to mix up as they sit close; Cl-Cl is 244.
  • d 143: 143 is the O-O single bond; Cl-Cl is 244.