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Question

Th e energy required to break one mol of Cl-Cl bonds in Cl2 is 242 kJmol-1​​​​​​. The longest wavelength of light capable of breaking a single Cl-Cl bond ​​​​​​ is

A. 594nm

B.640nm

C. 700nm

D.494nm


Solution

Bond energy of single bond = 2426.023×1023=4.017×1022KJ=4.017×1019J
Now E=hcλ or λ=hcE
=6.626×1034×3×1084.017×1019=494nm




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