JEE Main 2010Annual, Paper 1ChemistryEasyAtomic Structure113× since 2002
The energy required to break one mole of Cl–Cl bonds in Cl₂ is 242 kJ mol^–1. The longest
wavelength of light capable of breaking a single Cl – Cl bond is
(c = 3 x 10⁸ ms^–1 and N_A = 6.02 x 10²³ mol^–1)